Great video, weight is the no 1 enemy of movement followed by hydrodynamic drag and aero dynamic drag. Drag is best understood as friction through water, hull below waterline, foils and propellers. Or air, mast, rigging, superstructure above the water line. Good design manages these variables cleverly. Bad design ignores or tries to hack them. Material choice ( fiberglass and it’s core material, Aluminium, or timber, think wharram .) Determines how it’s built and plays into what the designer can achieve. Then it’s details which play into these macro elements. Speed in the bank is a huge factor, how one uses it is great seamanship. You exhibited a great knowledge of it all, it was a pleasure to see and hear.
Gotta respect Tim. He likes where he is in life and what he wants in a cat. He’s open to ideas, but after doing this for 30 years, he knows what works. He also likes his quiet life, and the size of his yard, and what needs to be in a performance/cruising cat. Looking forward to getting down there and getting started.
@@SailingLifeonJupiter You too Bro. You are in your natural space. It's pretty amazing what you two have accomplished over the past year, even in a world in pandemic. And you're just getting started, living the way you want, not the way others want you to. All my respect.
Excellent idea to weld the through holes in. Most of the ships sea chests I saw were welded in with replaceable valves on top. If the aluminum pipe showed signs of wear you could always hole saw it out and weld a new one in on the hard. I reckon Tim will like your idea as an option, regards Steve.
i think you could do that on the water if you plugged the outer hole with a stopper then cut the pipe below the defect and then figged on a new section. i wonder if he keeps a mig or a/c tig welder and argon onboard? i know dewan makes some tiny 120v machines.
Great video!!!!! You explain your substantial knowledge, -(you spent 4 years building...)-, without pomp or ceremony... Felt like I was talking to a good-buddy, no posturing, just talking about something he knows something about... BTW; I wanna retire building a cat, which is no longer likely to be ‘glass.’
Thank you Jamie, for a genuine appraisal, it gives a great summary for people looking at Ally for cruising cats, the boat looks amazing, and i fully agree with you, she was not hobby horsing, it was experiencing a shorter wave set, life is full of muppets.
Thanks lots of information, technology, well done. Are you sure you're not a partner/sales professional. Really great presentation. An eye opener. Thanks to you both. Elle.
LOL, the 50 ft hulls were probably mine. Tim just had them completed and pulled out in the yard until we can get there to start on the bridge deck after travel returns to "normal".
Sure Clay... if you've got the time to hang, it would be very educational...and you could get your hands dirty!... But Tim does the project managing...and he certainly knows what he is doing.... I visited usually once a month for a couple days at a time.
Great video. So informative. So many additional things to think about with an aluminum boat. Also, 400k is an absolute steal for a 48' performance cat. You sure can't find a used one for that either.
That was super interesting Jupiter people. If I were to build an aluminum boat again (now mono, Reinke 13M) this design would be at the top of the list. Weight and sailing characteristics are amazing. I had also tried to find a solution to separate minus from hull and failed. But have no problem with it so far after 22 years in the water. Technically oriented episodes have my special attention, but your other posts are also worth seeing. Keep up the good work.
Aye m8’s, this is one of the best, most transparent, clarifying Q&A I've ever seen on TH-cam. Very good! And I'm impressed about Princess super professional acting through the whole vid, like a experienced news anchor. Thnx guys for sharing all this nutritious info! 🙏
Good video. I'm very curious about your Mumby. (Hopefully I'm not too much of a busy body.) Your cabin walls: gelcoat on a waxed mold, etc.. is how sea kayaks are made. Good method. Here's what happens if there's ever a change needed or damage. I have a sea kayak that was hauled on to a dock while full of water. It folded right in half, huge holes busted out of the glass/kevlar hull/deck. You grind out the loose damaged material, feathering the hole. Then you trace an outline and cut a few layers of fiberglass each layer smaller than the one beneath it. (biggest on the bottom, smallest on top) Then on construction plastic (won't stick) you stack them up and apply epoxy. Easy. Put it over the hole smooth it out. Then a layer of epoxy with some lightweight fairing filler, sand it flat, color it - done. Gel coat can be reapplied and epoxy, vinylester, the fairing compound can all be sanded down through the grits and buffed out shiny as a mirror. You can brush on gelcoat and sand it, synthetic-steel wool, buff it to perfection. Fiberglass (GRP) on the inside of an aluminum boat is really a great way to build. You boat should last a hundred years. (The cheaper and older balsa core boats are basically temporary. I've built two cedar cored sea kayaks. One tiny hole or scratch or crack, water gets in and the epoxy won't fail, but it will pull off in large sheets taking a layer of the wood - which is the same thing. The only issue with running wires through conduit embedded in insulating foam is actually heat. There should be specs on this. It's against the (U.S.) Nat. Electric Code to run romex (plastic shielded wiring) or an extension cord through any kind of conduit because of heat. With LED lights being so efficient heat won't ever be an issue. If I had a suggestion to make I'd say look at all the boat cabins you can, find out where all the lights, fans( usually in the corners) are and then run the flexible conduit to all the possible spots with a piece of iron at the end - so it can be found with a magnet and then run all the conduit to where the electrical panel is and label the empty conduit. Then when you need to install a fan you already have conduit going to that spot. Snaking wire can be tricky but once you've seen someone who knows how to do it it's easy - even I learned. All the electric motor sailboats I've seen on TH-cam videos (and the Outremer 45 that was going to circumnavigate but turned around) have almost no range. Like sail to displacement ratios, there's no way to cover a boat in enough solar panels to effectively replace the performance and range of diesel engines - even for the minimal use of a sailboat. It can be done, there will just be days were you cannot go anywhere. However, the Mumby as a performance cat has the first criteria, being able to sail in light winds. One of those heavy 'cata-condo-marans' that have to turn on the engine in 6-7 knots winds won't get very far with electric motors. (This is from a happy Tesla owner - so my bias is for the electric motor.) And yep, this is also what I've learned as I search for a multi-hull: Most cats have pretty good cruising speeds, the real plus of a performance cat is being able to sail in lighter winds. re 'the plastic spacer.' This is like a dielectric coupling for connecting copper pipes to zinc galvanized pipes. I've got years of experience with this. First of all if you don't use a dielectric coupling (a plastic sleeve/seal separates the copper from the zinc) your galvanized pipes will rapidly corrode(rust) and leak. The house I live in the contractor put in a new copper waterline to the house, connected it directly to new galvanized pipes. Within three years the longest pipe in the house was rusted and leaking along its entire length. Other pipes were rusting too. I've never seen it this bad before. I replaced most of the piping with copper, used dielectric couplings at every connection - 12 years no problems. Plumbers have told me that eventually even with the couplings there will be a problem. I've never seen it. So I think with some care your boat should be fine. And on an aluminum hulled boat I'd prefer aluminum through holes welded to the hull with the plastic fittings inside the hull. I've seen too many plastic fittings on tanks, swimming pools and things get just a bit too much stress and snap off or crack. Position the right sized bungs and some kind of mallet next to all of them- but so they won't float away. Maybe also a chisel in case there's a piece of the plastic fitting sticking in the way. I'm sure there are boat people who know a lot more than I do.
Hey WillN2Go1... appreciate your advice... a lot of info there...had to reread a few times... In a couple of years we will be back in Philippines, for Jupiter to get a spruce up... I'll get Tim to weld the thru hulls then... Not much else to modify on this boat... Cheers
@@SailingLifeonJupiter You've got me really thinking about the Mumby. I was thinking wouldn't the Garcia Explocat be terrific if it had shaft propellers (instead of sail drives) and deployable skegs.... duh, that exists - it's the Mumby. And it's about 1/3rd the price. Really enjoying and appreciate your videos. Fair winds.
The wiring in the ceiling, now you explained its in conduette is good . I think access to all cabling as in time And metal will get effected by the salt. Easy to replace amazing, its a shame all other manufacturers don't do this throughout the boat , especially on a cat when you want to get from Hull to Hull,
@@SailingLifeonJupiter Heart attack pictures, fatty foods is animaIs cIogged arteries, hard arteries, PH 5, no fibre🧟♂️🦠🍔🥓🥩🍗🍳🧀... 🤮. Vegans don’t stink. PH 7 , plants have fibre ✅😉, vegans are peaceful, Peer review science. Actual pictures of the heart. th-cam.com/video/15wgYsToORM/w-d-xo.html !!! th-cam.com/video/pFPFnhfuLrE/w-d-xo.html Vegans don’t have this problem because that is the animals. Vegans don’t get clogged arteries, 4% cancer if you’re vegan. Meat based diet 51% death rate. That is extremely high for a frigging burger etc. Gorillas in the wild, have 1 percent cancer. And they never ever eat animals !!! Peer review science !!!! TH-cam delicious vegan food. Time to change ✅❤️😉
Good clarification on the wiring! After the previous videos it seemed like the wiring was just stuck up there with foam over it. My primary thought was "at least run it through conduit so it can be replaced if needed", so knowing that it is makes it all better. I've gone back and forth several times on whether I want to go aluminum or composite. Aluminum has some real advantages (including being completely recyclable and substantially cheaper for a one off custom build) and as long as the boat is big enough it can give composite a real run for its money weight-wise. But upkeep and repair-wise, I think composite wins. Anyone can patch a composite hull, even if it's ugly, as long as you give it a good surface, mix the resin right, and give it time to cure, you're left with a solid patch. Aluminum... well, I personally can't weld aluminum, and even among welders welding aluminum is somewhat a "specialized" skill. I forget which channel it was, but I just watched a video the other day where they couldn't find anyone that was even willing to weld aluminum for them. Even if I could weld aluminum, I'm not sure carrying a welder and having an inverter capable of powering said welder would be a wise weight investment, lol. But ultimately, I think this is one of those decisions that gets made for you most of the time. It's not like there are a ton of options out there for aluminum cats, so if you aren't a fan of those options, it means composite, unless you can spring for a custom design. Currently I am leaning heavily toward the Grainger Raku 48.
The Canadian couple from "Distant Shores" have about 30 years experience making cruising videos are currently having made a custom aluminum monohull. The major factor in choosing aluminum was that tolerances and fittings are much closer due to using Computer Aided Design software and precision cutting.
I have an older aluminium sailboat and it's always wise to carry marine epoxy and aluminium sheet onbourd for patching any repairs best one is pioneer non-sag made in the Philippines it will get you out of a leaking situation in the water or out
Can you please explain about the built in safety in the design, collision bulkhead, are the tanks stand alone or part og a double bottom design. Will the daggerboards break apart without damaging the hull in case of a grounding. What happens if you have the rudder hard over and run aground, will it still tilt up and out of the water or will it get stuck in the hull, is that part of the hull a collision bulkhead??
Great vlog and since watching your channel like many other people I have been impressed with the Mumby design .. seems everyone has problems with switches as the cheapest design wins out .. I’d rather invest in robust and redundancy especially in a cruiser/live aboard .. keep the videos coming and fair winds while in the Caribbean .. from mid Georgia in the US ..
Hello, nice simple boat,i like it just wandering the alimiun thikness used in the diferent part (bottom hull, top etc...) and the quality of the alumium thank you
If and when the inner forstay is re-done to make it removable it might be easily stored next to the shrouds as the length would match up better than attachment to the mast. On electrical and safety you're top notch so I would encourage you to make story boards and explain floating earth electrical grounding and neutral wiring on an aluminum boat. Thanks for another excellent video.
hello cordial greeting I was impressed with the performance of your Cat. and I understood the advantages of when there is no wind, you have helped me a lot to choose the boat that I want to build
Nice cat. Had actually found this design somewhere on the web 6, 7 years ago. And had forgotten about it. Thanks for bringing it back to my memory. In regards to Top speed, I think it is far more interesting for Cruisers to know, what had been your top milage per day and whats your average daily milage on a passage? For the technical part, whats the aluminium sheet thickness on your boat and are on the bow and stern thicker sheets used? Keep enjoying your sailing trip.
Yeah Steven, it’s hard to find an affordable performing cat these days…. So far our ocean passages have been hugely variable….the IO was mostly blowing 30-40kts….the Sth Atl was less than 10kts of breeze, and right up the bum (slow) on shorter runs of a couple days or so, with consistent wind of about 15-18kts weve done 250nm’s a day….I’m happy with anything over 200nm a day….the ally plate is 4mm hulls and 3mm decks.
Hi guys, we made our inner forestay and bridle out of 10 mm dynema and tension with a rigging screw I lash it to the backstay when not at sea to make tacking easier on the sail. Our through hulls are 25 mm round bar welded to the hull, and threaded with 3/4 plumbing dies with a 12mm hole drilled, leaving 5mm wall thickness at the thread. As for painting the bilges ask anyone who has an aluminium boat with painted bilges 20 yrs old, I have met dozens who regret ever letting paint near the bilge. The trick is no leaks, we sprayed lanolin ( lanox) as a precaution before launching 6 yrs ago. I still hose the bilges if we spill any salt water and keep a container under the shaft seals to catch the odd drip. Question did you make integral hull water tanks and if so did you paint inside? I did and it is starting to bubble up and flake , so we might resort to putting bladders in. Not ideal but if I built again I think I would use polypropylene tank/tanks on the bridge deck . Cheers Shayne Mumby Cyber Yes !
Ah Shayne... Some great info there.. Tks for that... Tim did paint the bilges under the engine, but no where else... So I might not bother now!... Yes integral water tanks. And epoxy painted welds only to seal any pinholes.
That is a never nice boat, and the price is pretty amazing. I really enjoy your channel, do you plan on doing a cruising budget video anytime soon? I would like to see the drawings for larger boats Tim has plans for.
Could future CAT built using glass???? How many times have you had done " bottom job" since you started sailing Jupiter???Saves all the worries n problems you mentioned.... mayb reinforced glass technology will improve in the future.... good luck n stay safe.... thanks for the enlightment n info....
Super boat, thanks for all your videos. Can you comment on any AC on board. I worry that the Aluminium with only 1 or 2 inches of closed cell/2 lb. foam (and) all the thermal bridges (aluminium ribs & gussets) it must get warm. And do you use any solar attenuation devices?
Tks Simon... No ideas on AC.. That would mean a heavy generator or marina... We don't use either... White decks keeps the temps down... Never a problem to walk on.
If your using those corrugated flexible orange conduits from the Philippines it will be tough to replace those wires best to use the rigid orange pvc conduit pipes.
Hi again Jupiter! What a nice story! Having seen most of your videos I'm very impressed by your skills and what you achieved… Once again congrats. Very impressed too by the quality of the job done by the boatyard who built Jupiter². A question about that: would they be able to build any other custom catamaran based on the plans of an architect or do they offer only the Mumby 48’ and 50’?
Hi Guys, I could easily restate all the quotes about great boat find, price and finish etc. So I won't, even though I just did - lol. I will say in the video quality and content area, I truly like what your doing and appreciate your style. It seems to me that one aspect of design that is lacking for cruising - live aboard vessels is dedicated space for solar. Most everyone appears to want it and it always ends up an after thought for placement and space. One other issue that popped up in an earlier video you did was condensation from the cold metal. I'm not sure how bad it gets??? But wondered if that was a design issue that could be addressed??? And finally I'll encourage you once again: Please do some back story vid's like where did you grow up and how did you get involved in flying - sailing and what type of work did you do before all of it? Then how about some romance???? How did you run into Princess? was it love at 1st sight?? Were you as cool as you appear now when you 1st approached her??? Or did you crash & burn on your 1st attempt?? See Jamie - there are lots of great stories to tell!!!! All the best, Jack
Hey Jack...thanks for the storyline ideas!...hehe, perhaps we will spice it up a little for ya!... That condensation was only a problem in the cold of a Cape Town winter whilst running the blow heater all night!... we tend to stay away from that sort of weather... . I do believe it is a common problem on any boat in those conditions.
Hi Jack. It's not too hard to fit a fair bit of solar on the Mumby 48s. I have 1.7kW on mine with two 430W panels on the bimini and two over the dinghy davits. That makes us pretty self sufficient energy wise. That said, if I was building, I'd definitely be looking at designs that can fit more again.
Technically speaking metal boats are safer than composite if struck by lightning, however that difference is pretty minor. The electricity will always try to take the path of least resistance, so a metal hull that sits in the water should conduct that electricity directly. However, lightning is ridiculously powerful, and a few mm of metal aren't a guarantee that the lightning won't just pass right through you as well. Your safety is probably more impacted by your distance from anything conductive than it is by the hull material. I know that carbon fiber masts have special safety issues for lightning strikes because carbon fiber is far more conductive than aluminum and can actually cook the resin in the mast along the path of electricity, resulting in the mast potentially needing to be replaced ( a definite advantage of aluminum masts, lol. Though, there is a reason why experiencing something super unlikely is often equated to getting struck by lightning). The most likely point of getting hit with lightning is going to be the tall skinny metal thing sticking way way up in the air. From there the power will flow through the shortest, easiest path to ground. Regardless of whether this is an aluminum or fiberglass boat, that path is probably not going to find you, unless you happen to be touching something conductive.
I'm guessing the 45 and 50 ft versions would use the same hull width/shape, just change the length. Would they all have the same beam and bridge deck cabin?? Excellent video, BTW.
Thanks a lot for that Jamie. I did get in touch with Mumby about 6 weeks ago, he answered that he was back building the boat. I then fired out a bunch of questions and still waiting for the answers...You have answered a few here. I find it very concerning if the yard is overwhelmed and you can't get a good communication with the builder all the way in the Philippines. A couple more questions that I wish I had answers for if you don't mind : What are the saloon windows made of? Can you fix, change, reseal them. How do you ventilate the saloon? (from the top hatches only ?) What reefing system do you have? What can be installed? What is the deal with the Philippines? Can you import parts tax free, or get the tax back when you leave? Can you stay in the Philippines after delivery for a few months to stay close to the base and iron out the problems? The Mumby design is truly great but a bit dated....especially when it comes to the cockpit and connection with the saloon. is there anyway to improve that? Would the 50 provide 2 more feet of cockpit space? Thanks so much for all the info. It is great that Mumby gets to sell his production. Catamaran demand is totally off the charts now. You did yours at the right time for the right price. Most of us will have to wait 5 years or more...There are amazing deals on monos...just kidding. Fair winds.
Yeah, i know it can be a stress with communication or lack there of... but at some point you need to have the faith that they do a good job... he is the designer after all and has pride in that... So all the transparencies are normally polycarb... but you can use what ever you like. Ventilation i've got 2 overhead and 2 in the front windows in the saloon... I've gone with the standard slab/jiffy reefing at the mast base... but up to you how you want to rig it. PI has high import taxes... so i used to bring in suitcases full of gear in my luggage when i visited, most months.... The standard tourist visa is 1mth only, but can be extended month at a time. I agree about the cockpit...and i'd be keen to discuss it with Tim to see if anything can be done... But i suspect it would be a complete redesign... since any increase in space in the cockpit would mean reduced aft cabin space... and if there was a walkthru transom, the rear crossbeam would be compromised.... A difficult one.
@@SailingLifeonJupiter Hey again Bro. Yes, Tim drew up some new plans for me to open up the cockpit from the scoops, and he had to submit them for government approval, which cost some. And yes, opening up the cockpit from the sugar scoops means losing space in the aft cabins. So, a compromise. Seems like the engines will need to be under the beds. I’m going for the 50’ version, but that doesn’t automatically add space to the cabins as the 2’ increase has to be proportional. But I need the open transom for diving, so for me, worth the compromise.
@@SailingLifeonJupiter So can you easily change the windows when they eventually craze, what about fixing sealing problems. Form the videos they seem to be embedded and inaccessible. That is why I ask. Cheers
The interior or the boat is made from fiberglass panels. They are made on a flat surface about 4' x 8'. Much of the interior has been copied with patterns which speeds up the process of finishing the interior. However there is always the ability to customize various parts of the interior. The interior finish looks great but it is very labor intensive. Tim has spent years training his crew to do this work as quickly and with as high a quality as possible.
I totally understand and recognize the quality and ability of the Mumby design and the capability of the materials it's made of. But since so few are being build, it's a rare duck, and then you mention Lagoon as being overweight and slow. Well, the Lagoon 45 will any day sail half windspeed, and do it in a very secure, comfortable way. Lagoons are mass produced and are therefore actually obtainable. They are somewhat pricey, but hold their value well, and are easy to sell on, if the owner so desire. I am not sure that's so easy with a boat produced in extremely small numbers, specifically customized to the first owner's needs and wants. One offs are more expensive to buy and harder to sell. One-offs demands a long waiting time from order to delivery, and in many cases doesn't have a very nice finish to them. To me a thoroughly tried and tested product gives me more confidence than the opposite. Just my 5 cents, because everyone seems to be picking on the Lagoon... 😉
A big greeting, I congratulate you, excellent Catamaran.I would like to ask : if it is possible to see more dynamics in Your channel? like only one day of adventures under water ,explaining the scuba diving in detail. Another epic day, singing several songs, the wife is very talented, the vocalist and captain of the Air and Sea on the guitar, another day just technical or mechanical, perhaps making the story super interesting, in the story and the music in the background are the magic.Is the stage ready? the cameras are rolling... Go action , final cut! best wishes
Really appreciate your channel Jamie, and love the design. I’m interested in the design plans to build one to cruise the east coast of Australia, how do I get into contact with Tim if you don’t mind?
At 3:57 you mention the light ship displacement being 6,100kg, but everywhere else that I find very sparse info on Mumby48 the light displacement is listed as 8,000-8,500kg, with max-load at 8,700. Am I missing something? I'm surprised because 6,100kg would put it 2,000-2,500kg lighter than some of the most advanced performance-cruisers like Gunboat48, TS5 made of carbon-fiber. Is dry weight really 6.100kg? Did you have it weighed?
Nah Garen... my boat has always been heavy with all my shit on board!... I'm just relaying what Tim wrote in the specs.... but ally is LIGHT and STRONG!..... but no good for mass/fast production (no moulds).
I'm liking this boat design much more now that you've explained it. I'm still not sure what the difference in weight is between yours and a Schionning Arrow 1360 and if your boat is the same width and mast height as the Schionning Arrow 1360. Everything I talk about is focused around the Schionning Arrow 1360 because I saw a TH-cam video about it and the boat name is Duet. It's such a beautiful boat and has a curved front cross bar which gives it sex appeal. I also love the deck house design and the hard cover design over the transom helm position. Your boat has some of these great qualities and I'm basically looking for some comparisons because I can't afford a Schionning Arrow 1360 unless I start a TH-cam video channel like you :)
@@joeblaney684 Now I only want to go with an aluminum cat but need to learn how to weld because Tim Mumby is swamped with orders and has a waiting list a mile long. I spoke with the Schionning team about seeing if they can send me plans and CNC cut files for an aluminum build. I'm not sure if they are willing to do that yet but we shall see. If not than I'm going to build a Mumby Cyber 48 or 50.
@@joeblaney684 I'm going with aluminum for sure after I've watched every one of Sailing Life on Jupiter's videos. I've even changed my mind on being dead set on a galley up design to now wanting a galley down. The aluminum has many more advantages than any other material including price which is a very large factor for me. I will make a curved front cross beam and have the anchor up front and have a fixed spinnaker pole. I'll also make my own carbon boom with wings to hold the main sail. I'm not sure if there might be a better design than the Mumby kick up rudder system but I'll think about it. Now I just need to learn how to weld.
Thanks for this guys! Small thing; what do you think about the practicalities of raising the dinette/settee area on a platform by some inches to allow easier vision when seated? I'm not too tall and I notice the windows seem to be a little above you guys when you are seated.
@@SailingLifeonJupiter (This is my first comment on your videos- you are beginning to make me think I will be saving up for a Mumby!) Fatter upholstery would certainly raise *nevillesax* enough to see out the windows but as a woodworker furniture builder, I can tell you that you just can't change one dimension without affecting another. If the seat is higher, a shorter person, like my 5 foot tall wife, would have a hard time getting up onto the cushion. Then once up on it, they would be uncomfortable with their feet dangling for any length of time. I think a better solution would be to have part of the floor raised, if not the entire floor. Maybe some storage could be incorporated below? It would obviously lower the clearance for headroom in that area but, that may not be a problem for those requesting the modification!? Many Cats I have seen have a raised floor under the saloon table/seating.
Awesome discussion! I'm studying catamaran design and learned that a fractional rig such as the Cyber will have a lot of weather helm when the rig COE (center of effort) is aft of the CLR (center of lateral resistance). Looking at Jupiter, the daggerboards look pretty well aligned with the mast so presumably the normal COE would be aft of the mast. Does Jupiter have excessive weather helm? And if so, do the rudders cause the boat to slow down while overcoming it? Sorry for the geek question but I'm trying to figure out a sail plan and autopilot requirement for a boat with the same sort of underwater profile as Jupiter.
atomvoyages.com eliminated weather helm on his 28 ft Pearson Triton sloop by shortening the mast 1.5 feet and making the formerly fractional jib a masthead jib rig. Now the helm is balanced.
Hey Brian... it can do on occasion, depending on the weather/angle... but it just means you need to balance the sail plan, according to the conditions.... it would indicate that the main is overpowered and needs a reef... or the other extreme is more headsal required...screacher!.... and fur sure, if you're holding too much weather helm, you're just dragging your rudders.
So would you recommend a main with a lot of roach that might be too powerful or an ordinary point sail? I realize it depends on conditions. In light winds I assume you could reach with the main and code zero?
What about a gen set and AC. I am spoiled and I need AC at least in my sleeping cabin. The tropics can be very muggy when trying to sleep. I have used the sailing small water force gen sets on the stern to charge batteries without solar but is there or could there be a dedicated space for a small diesel gen set?
Very interesting to learn a lot. Plus, your moderator is cute as a button. Makes me want to get back to the Islands from Florida as soon as restrictions are gone! In the vid clip of the bouncing: My thought was how Galant the lady cut through the water. It is as if she is slicing the waves not pushing them out of the way.
Inner removable forstay , if you had gone that route from the beginning? Would you to this question what different would you have said make the inner forestay permanent Because you have to attach the sail, lift by hand its not on a furler . I got the impression you have leak issues with the water system leaking ,
The genoa gets caught up on the inner forestay when tacking... But we don't really tack that often... (usually avoid going upwind!)... In fact I could just unscrew the turnbuckle and get it out of the way. So I found that my watermaker pushes air bubbles into my hoses, which are compressable of course...so my pump would run. Now after making water I bleed my water system to remove the air... No more problems!
@@SailingLifeonJupiter as your doing the trades , I didn't think you tack much , it is a back up if the first at fails , have you tried sailing in lighter airs with both,
Thank you great informative video looking forward to the next update. You just answered a whole lot of questions that I thought of previously but never asked you personally. 😄
Great video, weight is the no 1 enemy of movement followed by hydrodynamic drag and aero dynamic drag. Drag is best understood as friction through water, hull below waterline, foils and propellers. Or air, mast, rigging, superstructure above the water line. Good design manages these variables cleverly. Bad design ignores or tries to hack them. Material choice ( fiberglass and it’s core material, Aluminium, or timber, think wharram .) Determines how it’s built and plays into what the designer can achieve. Then it’s details which play into these macro elements. Speed in the bank is a huge factor, how one uses it is great seamanship. You exhibited a great knowledge of it all, it was a pleasure to see and hear.
Thanks for that Joe... Appreciate it.
Gotta respect Tim. He likes where he is in life and what he wants in a cat. He’s open to ideas, but after doing this for 30 years, he knows what works. He also likes his quiet life, and the size of his yard, and what needs to be in a performance/cruising cat. Looking forward to getting down there and getting started.
Yeah i agree Ron... happy with his lot.
@@SailingLifeonJupiter You too Bro. You are in your natural space. It's pretty amazing what you two have accomplished over the past year, even in a world in pandemic. And you're just getting started, living the way you want, not the way others want you to. All my respect.
Fabulous! Streets ahead in quality building compared to Lagoons and Leopards. Your logic is spot on.
Ovewr and over I came to see this boat. Jupiter is a very nice boat.
Excellent idea to weld the through holes in. Most of the ships sea chests I saw were welded in with replaceable valves on top. If the aluminum pipe showed signs of wear you could always hole saw it out and weld a new one in on the hard. I reckon Tim will like your idea as an option, regards Steve.
Yep, Cheers Steve
i think you could do that on the water if you plugged the outer hole with a stopper then cut the pipe below the defect and then figged on a new section. i wonder if he keeps a mig or a/c tig welder and argon onboard? i know dewan makes some tiny 120v machines.
Great video!!!!! You explain your substantial knowledge, -(you spent 4 years building...)-, without pomp or ceremony... Felt like I was talking to a good-buddy, no posturing, just talking about something he knows something about... BTW; I wanna retire building a cat, which is no longer likely to be ‘glass.’
Niiice...appreciate the feedback... Thanks Naturalook!
Thank you Jamie, for a genuine appraisal, it gives a great summary for people looking at Ally for cruising cats, the boat looks amazing, and i fully agree with you, she was not hobby horsing, it was experiencing a shorter wave set, life is full of muppets.
Thank you Fair winds
Thanks lots of information, technology, well done. Are you sure you're not a partner/sales professional. Really great presentation. An eye opener. Thanks to you both. Elle.
LOL, the 50 ft hulls were probably mine. Tim just had them completed and pulled out in the yard until we can get there to start on the bridge deck after travel returns to "normal".
Me likey!
The 48 or the 50 would be an awesome boat to have. Is there much difference in dimensions? Henry
@@shanevillis4079 sorry for the delay in replying. I do not have plans to compare side by side. I believe it is added in each cabin.
@@hdhouse3 Thanks mate
I love your boat. I bet the waiting list is much longer now. Do you recommend being there and supervising the build?
Sure Clay... if you've got the time to hang, it would be very educational...and you could get your hands dirty!... But Tim does the project managing...and he certainly knows what he is doing.... I visited usually once a month for a couple days at a time.
Wonderful QaA, well done! Thanks a lot you 2.
Cheers Patrick
She is incredibly light !! Excellent
Ya great design... Cheers
Your channel is the ONLY source of info for the boat! Sorry about peppering you with questions!
No probs Jay!
@@SailingLifeonJupiter Sounds like its time for Mr Mumby to increase the size of his Filipino workforce. Not to mention the size of his boatyard.
@@edfrawley4356 Makes you wonder how many other small operators are out there that don't advertise or have internet information available.
Great video. So informative. So many additional things to think about with an aluminum boat. Also, 400k is an absolute steal for a 48' performance cat. You sure can't find a used one for that either.
Yeah Dan it is still a great deal... 2nd hand market price is about the same as new!
That was super interesting Jupiter people. If I were to build an aluminum boat again (now mono, Reinke 13M) this design would be at the top of the list. Weight and sailing characteristics are amazing. I had also tried to find a solution to separate minus from hull and failed. But have no problem with it so far after 22 years in the water. Technically oriented episodes have my special attention, but your other posts are also worth seeing. Keep up the good work.
Awesome...thanks for the feedback Albert.
Aye m8’s, this is one of the best, most transparent, clarifying Q&A I've ever seen on TH-cam. Very good! And I'm impressed about Princess super professional acting through the whole vid, like a experienced news anchor. Thnx guys for sharing all this nutritious info! 🙏
Haha... yup she's a good smiler and nodder.... Thanks mate
Good video. I'm very curious about your Mumby. (Hopefully I'm not too much of a busy body.)
Your cabin walls: gelcoat on a waxed mold, etc.. is how sea kayaks are made. Good method. Here's what happens if there's ever a change needed or damage. I have a sea kayak that was hauled on to a dock while full of water. It folded right in half, huge holes busted out of the glass/kevlar hull/deck. You grind out the loose damaged material, feathering the hole. Then you trace an outline and cut a few layers of fiberglass each layer smaller than the one beneath it. (biggest on the bottom, smallest on top) Then on construction plastic (won't stick) you stack them up and apply epoxy. Easy. Put it over the hole smooth it out. Then a layer of epoxy with some lightweight fairing filler, sand it flat, color it - done. Gel coat can be reapplied and epoxy, vinylester, the fairing compound can all be sanded down through the grits and buffed out shiny as a mirror. You can brush on gelcoat and sand it, synthetic-steel wool, buff it to perfection.
Fiberglass (GRP) on the inside of an aluminum boat is really a great way to build. You boat should last a hundred years. (The cheaper and older balsa core boats are basically temporary. I've built two cedar cored sea kayaks. One tiny hole or scratch or crack, water gets in and the epoxy won't fail, but it will pull off in large sheets taking a layer of the wood - which is the same thing.
The only issue with running wires through conduit embedded in insulating foam is actually heat. There should be specs on this. It's against the (U.S.) Nat. Electric Code to run romex (plastic shielded wiring) or an extension cord through any kind of conduit because of heat. With LED lights being so efficient heat won't ever be an issue. If I had a suggestion to make I'd say look at all the boat cabins you can, find out where all the lights, fans( usually in the corners) are and then run the flexible conduit to all the possible spots with a piece of iron at the end - so it can be found with a magnet and then run all the conduit to where the electrical panel is and label the empty conduit. Then when you need to install a fan you already have conduit going to that spot. Snaking wire can be tricky but once you've seen someone who knows how to do it it's easy - even I learned.
All the electric motor sailboats I've seen on TH-cam videos (and the Outremer 45 that was going to circumnavigate but turned around) have almost no range. Like sail to displacement ratios, there's no way to cover a boat in enough solar panels to effectively replace the performance and range of diesel engines - even for the minimal use of a sailboat. It can be done, there will just be days were you cannot go anywhere. However, the Mumby as a performance cat has the first criteria, being able to sail in light winds. One of those heavy 'cata-condo-marans' that have to turn on the engine in 6-7 knots winds won't get very far with electric motors. (This is from a happy Tesla owner - so my bias is for the electric motor.)
And yep, this is also what I've learned as I search for a multi-hull: Most cats have pretty good cruising speeds, the real plus of a performance cat is being able to sail in lighter winds.
re 'the plastic spacer.' This is like a dielectric coupling for connecting copper pipes to zinc galvanized pipes. I've got years of experience with this. First of all if you don't use a dielectric coupling (a plastic sleeve/seal separates the copper from the zinc) your galvanized pipes will rapidly corrode(rust) and leak. The house I live in the contractor put in a new copper waterline to the house, connected it directly to new galvanized pipes. Within three years the longest pipe in the house was rusted and leaking along its entire length. Other pipes were rusting too. I've never seen it this bad before. I replaced most of the piping with copper, used dielectric couplings at every connection - 12 years no problems. Plumbers have told me that eventually even with the couplings there will be a problem. I've never seen it. So I think with some care your boat should be fine.
And on an aluminum hulled boat I'd prefer aluminum through holes welded to the hull with the plastic fittings inside the hull. I've seen too many plastic fittings on tanks, swimming pools and things get just a bit too much stress and snap off or crack.
Position the right sized bungs and some kind of mallet next to all of them- but so they won't float away. Maybe also a chisel in case there's a piece of the plastic fitting sticking in the way. I'm sure there are boat people who know a lot more than I do.
Hey WillN2Go1... appreciate your advice... a lot of info there...had to reread a few times...
In a couple of years we will be back in Philippines, for Jupiter to get a spruce up... I'll get Tim to weld the thru hulls then... Not much else to modify on this boat...
Cheers
@@SailingLifeonJupiter You've got me really thinking about the Mumby. I was thinking wouldn't the Garcia Explocat be terrific if it had shaft propellers (instead of sail drives) and deployable skegs.... duh, that exists - it's the Mumby. And it's about 1/3rd the price. Really enjoying and appreciate your videos. Fair winds.
@@WillN2Go1 Cheers... Those boats are pretty heavy too...good for ice tho!
Thanks for posting this guys - was really interested in the bridge deck clearance of Jupiter👍
Sure... Cheers Nathan
The wiring in the ceiling, now you explained its in conduette is good . I think access to all cabling as in time
And metal will get effected by the salt. Easy to replace amazing, its a shame all other manufacturers don't do this throughout the boat , especially on a cat when you want to get from Hull to Hull,
Yeah David... Its no problem.
Love your videos, thank you for sharing!
Glad you like them! Thanks Bill
Your a pilot? Wow I’m am too. I own a Bellanca 19-14-3. Now I want to sail.
Thanks for the video, very interesting and informative. Fair winds and following seas. 👍👍🐾
Cheers T Lowe...thanks for watching
I would love to have a Mumby 36' so I can solo it and take it into tight spots. I wonder if he would do a one off? Love your channel. Aloha~
Hi, great videos on these cats!
I recall, around 5 years ago, seeing "Lava" in Brisbane/Redcliffe.
Seeing a Mumby in the flesh, I was quite impressed.
Yep, I used to ogle Lava from the botanical gardens on the river in Brissy!... One of the earliest versions of this design.
@@SailingLifeonJupiter Heart attack pictures, fatty foods is animaIs cIogged arteries, hard arteries, PH 5, no fibre🧟♂️🦠🍔🥓🥩🍗🍳🧀... 🤮. Vegans don’t stink. PH 7 , plants have fibre ✅😉, vegans are peaceful, Peer review science. Actual pictures of the heart. th-cam.com/video/15wgYsToORM/w-d-xo.html !!! th-cam.com/video/pFPFnhfuLrE/w-d-xo.html Vegans don’t have this problem because that is the animals. Vegans don’t get clogged arteries, 4% cancer if you’re vegan. Meat based diet 51% death rate. That is extremely high for a frigging burger etc. Gorillas in the wild, have 1 percent cancer. And they never ever eat animals !!! Peer review science !!!!
TH-cam delicious vegan food. Time to change ✅❤️😉
Thanks you answered multiple questions I have had about aluminium boats.
Glad..cheers Warwick
Plukky has a build of a Mumby design right now. He is having it built in Vietnam, his video's are up now on YT.
Well RG, it aint a Mumby anymore.... they used the Mumby plans and then changed a lot of stuff... Will be more like a charter cat than a Mumby
Good clarification on the wiring! After the previous videos it seemed like the wiring was just stuck up there with foam over it. My primary thought was "at least run it through conduit so it can be replaced if needed", so knowing that it is makes it all better.
I've gone back and forth several times on whether I want to go aluminum or composite. Aluminum has some real advantages (including being completely recyclable and substantially cheaper for a one off custom build) and as long as the boat is big enough it can give composite a real run for its money weight-wise. But upkeep and repair-wise, I think composite wins. Anyone can patch a composite hull, even if it's ugly, as long as you give it a good surface, mix the resin right, and give it time to cure, you're left with a solid patch. Aluminum... well, I personally can't weld aluminum, and even among welders welding aluminum is somewhat a "specialized" skill. I forget which channel it was, but I just watched a video the other day where they couldn't find anyone that was even willing to weld aluminum for them. Even if I could weld aluminum, I'm not sure carrying a welder and having an inverter capable of powering said welder would be a wise weight investment, lol.
But ultimately, I think this is one of those decisions that gets made for you most of the time. It's not like there are a ton of options out there for aluminum cats, so if you aren't a fan of those options, it means composite, unless you can spring for a custom design. Currently I am leaning heavily toward the Grainger Raku 48.
The Canadian couple from "Distant Shores" have about 30 years experience making cruising videos are currently having made a custom aluminum monohull. The major factor in choosing aluminum was that tolerances and fittings are much closer due to using Computer Aided Design software and precision cutting.
Cool, tks Fleshbox.... Yep it's a tough decision... so long as you get on the water...thats the important thing.
On Board lifestyles (SV Basic) had the problem not finding a welder for their frames for their hard top they had built.
I have an older aluminium sailboat and it's always wise to carry marine epoxy and aluminium sheet onbourd for patching any repairs best one is pioneer non-sag made in the Philippines it will get you out of a leaking situation in the water or out
Can you please explain about the built in safety in the design, collision bulkhead, are the tanks stand alone or part og a double bottom design. Will the daggerboards break apart without damaging the hull in case of a grounding. What happens if you have the rudder hard over and run aground, will it still tilt up and out of the water or will it get stuck in the hull, is that part of the hull a collision bulkhead??
Thanks for all the info guys, appreciate it!
Great vlog and since watching your channel like many other people I have been impressed with the Mumby design .. seems everyone has problems with switches as the cheapest design wins out .. I’d rather invest in robust and redundancy especially in a cruiser/live aboard .. keep the videos coming and fair winds while in the Caribbean .. from mid Georgia in the US ..
Tks PO... Yeah hard to get quality gear these days.
Hello, nice simple boat,i like it
just wandering the alimiun thikness used in the diferent part (bottom hull, top etc...)
and the quality of the alumium
thank you
Tks yup.. Its 4mm hulls and 3mm deck of 5083 grade.
Hi guys , 2 questions , how do i go about getting in contact with Tim and what is the cost of your boat to build
If and when the inner forstay is re-done to make it removable it might be easily stored next to the shrouds as the length would match up better than attachment to the mast. On electrical and safety you're top notch so I would encourage you to make story boards and explain floating earth electrical grounding and neutral wiring on an aluminum boat. Thanks for another excellent video.
All good advice... Appreciate it UUB
This has been one of your better videos. Very positive
Cheers Jim
Wowzers. Lots of things to consider. Thanks for sharing your thoughts & build of your lovely vessel. Fair winds and safe travels.
Oh yes... A boat is a bag of worms! Thanks Pete
@@SailingLifeonJupiter at least with worms you can always go fishing.😉
hello cordial greeting I was impressed with the performance of your Cat. and I understood the advantages of when there is no wind, you have helped me a lot to choose the boat that I want to build
Glad to help out MR..
Cheers
Nice cat. Had actually found this design somewhere on the web 6, 7 years ago. And had forgotten about it. Thanks for bringing it back to my memory.
In regards to Top speed, I think it is far more interesting for Cruisers to know, what had been your top milage per day and whats your average daily milage on a passage?
For the technical part, whats the aluminium sheet thickness on your boat and are on the bow and stern thicker sheets used?
Keep enjoying your sailing trip.
Yeah Steven, it’s hard to find an affordable performing cat these days…. So far our ocean passages have been hugely variable….the IO was mostly blowing 30-40kts….the Sth Atl was less than 10kts of breeze, and right up the bum (slow) on shorter runs of a couple days or so, with consistent wind of about 15-18kts weve done 250nm’s a day….I’m happy with anything over 200nm a day….the ally plate is 4mm hulls and 3mm decks.
Nice work Jamie & Princess, Great information & well presented
Gee tks maaate
Hi guys,
we made our inner forestay and bridle out of 10 mm dynema and tension with a rigging screw I lash it to the backstay when not at sea to make tacking easier on the sail.
Our through hulls are 25 mm round bar welded to the hull, and threaded with 3/4 plumbing dies with a 12mm hole drilled, leaving 5mm wall thickness at the thread.
As for painting the bilges ask anyone who has an aluminium boat with painted bilges 20 yrs old, I have met dozens who regret ever letting paint near the bilge. The trick is no leaks, we sprayed lanolin ( lanox) as a precaution before launching 6 yrs ago. I still hose the bilges if we spill any salt water and keep a container under the shaft seals to catch the odd drip.
Question did you make integral hull water tanks and if so did you paint inside?
I did and it is starting to bubble up and flake , so we might resort to putting bladders in. Not ideal but if I built again I think I would use polypropylene tank/tanks on the bridge deck .
Cheers Shayne
Mumby Cyber Yes !
Ah Shayne... Some great info there.. Tks for that... Tim did paint the bilges under the engine, but no where else... So I might not bother now!... Yes integral water tanks. And epoxy painted welds only to seal any pinholes.
That is a never nice boat, and the price is pretty amazing. I really enjoy your channel, do you plan on doing a cruising budget video anytime soon? I would like to see the drawings for larger boats Tim has plans for.
Tks David... Yeah a budget vid might be a good idea. Will add it to the list
I’m really surprised that your subscription count hasn’t risen sharply. Great crew and informative/ entertaining videos.
Appreciate it Jack...tks... hopefully soon!
Thanks for taking the time to do this video. Always looking forward to are next meet on TH-cam .
Cheers Mike.. Appreciate it
That's the boat Plucky wants and raves about isn't it mate?
How much does a mumby Cat 48 plan cost and where do you buy the plan from any link please?
$5500 usd.. You can get them from us on Svjupiter2@gmail.com
Could future CAT built using glass???? How many times have you had done " bottom job" since you started sailing Jupiter???Saves all the worries n problems you mentioned.... mayb reinforced glass technology will improve in the future.... good luck n stay safe.... thanks for the enlightment n info....
Perhaps! Sounds heavy tho... 3 bottom paints in 6years so far.... I'm normally scrubbing every 2 weeks.
Tks for watching
Well, this would have been the video to see before I emailed you. Thanks for the reply!
Hehe...no worries
Super boat, thanks for all your videos. Can you comment on any AC on board. I worry that the Aluminium with only 1 or 2 inches of closed cell/2 lb. foam (and) all the thermal bridges (aluminium ribs & gussets) it must get warm. And do you use any solar attenuation devices?
Tks Simon... No ideas on AC.. That would mean a heavy generator or marina... We don't use either... White decks keeps the temps down... Never a problem to walk on.
Really good video, especially the electronics. Boat keeps looking better. Thanks
Cheers Sid
Great video as always guys. I was looking forward to this. Love your work. Thankyou.
Cheer Bob
thanks for that!
No problem RF.
Great looking boat! and you guy's are doing a great job with this channel, Fair Winds!!
Tks so much Chris
If your using those corrugated flexible orange conduits from the Philippines it will be tough to replace those wires best to use the rigid orange pvc conduit pipes.
You might be correct there... But I can't imagine needing to replace except possibly for a lightning strike.
I've used a lot of the orange flex pipe and have had no problem pulling wires in !!!
Really good channel, I sailed a lot on a Stratus 12, similar water clearance, could pass under it in the dingy, Queensland made.
Ah yep, I've been aboard one of those... Cheers Grancito2
Hi again Jupiter! What a nice story! Having seen most of your videos I'm very impressed by your skills and what you achieved… Once again congrats. Very impressed too by the quality of the job done by the boatyard who built Jupiter². A question about that: would they be able to build any other custom catamaran based on the plans of an architect or do they offer only the Mumby 48’ and 50’?
Hey Forza... Thanks for the kind words... No he only builds Mumbys and is flat out doing that...good luck with your plans.
Great info. Thank you. How can I finance this boat?
good content just subscribed best of luck
Tks Jose.
Usual discussion. Thanks.
Cheers Latitude
Hi Guys,
I could easily restate all the quotes about great boat find, price and finish etc. So I won't, even though I just did - lol.
I will say in the video quality and content area, I truly like what your doing and appreciate your style.
It seems to me that one aspect of design that is lacking for cruising - live aboard vessels is dedicated space for solar. Most everyone appears to want it and it always ends up an after thought for placement and space.
One other issue that popped up in an earlier video you did was condensation from the cold metal.
I'm not sure how bad it gets??? But wondered if that was a design issue that could be addressed???
And finally I'll encourage you once again: Please do some back story vid's like where did you grow up and how did you get involved in flying - sailing and what type of work did you do before all of it?
Then how about some romance???? How did you run into Princess? was it love at 1st sight?? Were you as cool as you appear now when you 1st approached her??? Or did you crash & burn on your 1st attempt??
See Jamie - there are lots of great stories to tell!!!!
All the best,
Jack
Hey Jack...thanks for the storyline ideas!...hehe, perhaps we will spice it up a little for ya!...
That condensation was only a problem in the cold of a Cape Town winter whilst running the blow heater all night!... we tend to stay away from that sort of weather... .
I do believe it is a common problem on any boat in those conditions.
Hi Jack. It's not too hard to fit a fair bit of solar on the Mumby 48s. I have 1.7kW on mine with two 430W panels on the bimini and two over the dinghy davits. That makes us pretty self sufficient energy wise. That said, if I was building, I'd definitely be looking at designs that can fit more again.
Thanks, very helpful.
Cheers Braith
Congratulations ! 😀
th-cam.com/video/thBXZR13Rwg/w-d-xo.html
Thank you! 😃
In event of a lightening strike, will the aluminum shell ack like a Faraday cage and protect you and inner components?
That is my impression Ying... I'm gonna do some more research and check on the theory... will let you know in a new vid....Thanks for watching.
@@SailingLifeonJupiter I'm guessing that the electrical components (mast light, weather vane, antennae etc) at the top of the mast would defeat that.
Technically speaking metal boats are safer than composite if struck by lightning, however that difference is pretty minor. The electricity will always try to take the path of least resistance, so a metal hull that sits in the water should conduct that electricity directly.
However, lightning is ridiculously powerful, and a few mm of metal aren't a guarantee that the lightning won't just pass right through you as well. Your safety is probably more impacted by your distance from anything conductive than it is by the hull material.
I know that carbon fiber masts have special safety issues for lightning strikes because carbon fiber is far more conductive than aluminum and can actually cook the resin in the mast along the path of electricity, resulting in the mast potentially needing to be replaced ( a definite advantage of aluminum masts, lol. Though, there is a reason why experiencing something super unlikely is often equated to getting struck by lightning).
The most likely point of getting hit with lightning is going to be the tall skinny metal thing sticking way way up in the air. From there the power will flow through the shortest, easiest path to ground. Regardless of whether this is an aluminum or fiberglass boat, that path is probably not going to find you, unless you happen to be touching something conductive.
not sure if it's a common question or not but....what were the skie's like when you were young ?
Nicely organized. I wish the build time wasn't so long and so far away.
Tks.. Yeah he might ramp up the operation, since he is getting so many enquiries...
Does the designer sell plans for the boat?
I'm guessing the 45 and 50 ft versions would use the same hull width/shape, just change the length. Would they all have the same beam and bridge deck cabin??
Excellent video, BTW.
I dunno Steve... Not sure where the changes in length take place...Ask Tim!
Thanks for watching.
Thanks a lot for that Jamie. I did get in touch with Mumby about 6 weeks ago, he answered that he was back building the boat. I then fired out a bunch of questions and still waiting for the answers...You have answered a few here. I find it very concerning if the yard is overwhelmed and you can't get a good communication with the builder all the way in the Philippines. A couple more questions that I wish I had answers for if you don't mind :
What are the saloon windows made of? Can you fix, change, reseal them. How do you ventilate the saloon? (from the top hatches only ?)
What reefing system do you have? What can be installed?
What is the deal with the Philippines? Can you import parts tax free, or get the tax back when you leave?
Can you stay in the Philippines after delivery for a few months to stay close to the base and iron out the problems?
The Mumby design is truly great but a bit dated....especially when it comes to the cockpit and connection with the saloon. is there anyway to improve that? Would the 50 provide 2 more feet of cockpit space?
Thanks so much for all the info. It is great that Mumby gets to sell his production. Catamaran demand is totally off the charts now. You did yours at the right time for the right price. Most of us will have to wait 5 years or more...There are amazing deals on monos...just kidding. Fair winds.
Yeah, i know it can be a stress with communication or lack there of... but at some point you need to have the faith that they do a good job... he is the designer after all and has pride in that...
So all the transparencies are normally polycarb... but you can use what ever you like. Ventilation i've got 2 overhead and 2 in the front windows in the saloon... I've gone with the standard slab/jiffy reefing at the mast base... but up to you how you want to rig it.
PI has high import taxes... so i used to bring in suitcases full of gear in my luggage when i visited, most months.... The standard tourist visa is 1mth only, but can be extended month at a time.
I agree about the cockpit...and i'd be keen to discuss it with Tim to see if anything can be done... But i suspect it would be a complete redesign... since any increase in space in the cockpit would mean reduced aft cabin space... and if there was a walkthru transom, the rear crossbeam would be compromised....
A difficult one.
@@SailingLifeonJupiter Hey again Bro. Yes, Tim drew up some new plans for me to open up the cockpit from the scoops, and he had to submit them for government approval, which cost some. And yes, opening up the cockpit from the sugar scoops means losing space in the aft cabins. So, a compromise. Seems like the engines will need to be under the beds. I’m going for the 50’ version, but that doesn’t automatically add space to the cabins as the 2’ increase has to be proportional. But I need the open transom for diving, so for me, worth the compromise.
@@SailingLifeonJupiter So can you easily change the windows when they eventually craze, what about fixing sealing problems. Form the videos they seem to be embedded and inaccessible. That is why I ask. Cheers
The interior or the boat is made from fiberglass panels. They are made on a flat surface about 4' x 8'. Much of the interior has been copied with patterns which speeds up the process of finishing the interior. However there is always the ability to customize various parts of the interior. The interior finish looks great but it is very labor intensive. Tim has spent years training his crew to do this work as quickly and with as high a quality as possible.
All correct Nicholas... I'd only ever recommend Tim to build these boats... If a custom builder did it, who knows what you'd end up with.
@@SailingLifeonJupiter Some owner / builders have done an excellent job at finishing their boats, usually at Tim's yard using his crew to assist.
I totally understand and recognize the quality and ability of the Mumby design and the capability of the materials it's made of. But since so few are being build, it's a rare duck, and then you mention Lagoon as being overweight and slow. Well, the Lagoon 45 will any day sail half windspeed, and do it in a very secure, comfortable way. Lagoons are mass produced and are therefore actually obtainable. They are somewhat pricey, but hold their value well, and are easy to sell on, if the owner so desire. I am not sure that's so easy with a boat produced in extremely small numbers, specifically customized to the first owner's needs and wants. One offs are more expensive to buy and harder to sell. One-offs demands a long waiting time from order to delivery, and in many cases doesn't have a very nice finish to them. To me a thoroughly tried and tested product gives me more confidence than the opposite. Just my 5 cents, because everyone seems to be picking on the Lagoon... 😉
Cheers Viking. You make some good points.
A big greeting, I congratulate you, excellent Catamaran.I would like to ask :
if it is possible to see more dynamics
in Your channel? like only one day of adventures under water ,explaining the scuba diving in detail.
Another epic day, singing several songs, the wife is very talented, the vocalist and captain of the Air and Sea on the guitar, another day just technical or mechanical, perhaps making the story super interesting, in the story and the music in the background are the magic.Is the stage ready? the cameras are rolling... Go action , final cut! best wishes
Haha.. Cheers Edward.
Thank you
You're welcome Peter
Hi since you’re first video about your boat I’ve been looking at them
Good on ya Evan.. Tks for watching
Really appreciate your channel Jamie, and love the design. I’m interested in the design plans to build one to cruise the east coast of Australia, how do I get into contact with Tim if you don’t mind?
Sure Jason... Email me on Svjupiter2@gmail.com and I'll hook you up
Gj that was fun. How da heck did you manage to find a boat nobody knows exists?
Gems are rare!...tks for watching.
Great jobs guys, thank you! One vote for the "floating earth" episode.
Noted... yeah, i'll have to get on to that vid.
At 3:57 you mention the light ship displacement being 6,100kg, but everywhere else that I find very sparse info on Mumby48 the light displacement is listed as 8,000-8,500kg, with max-load at 8,700. Am I missing something?
I'm surprised because 6,100kg would put it 2,000-2,500kg lighter than some of the most advanced performance-cruisers like Gunboat48, TS5 made of carbon-fiber.
Is dry weight really 6.100kg? Did you have it weighed?
Nah Garen... my boat has always been heavy with all my shit on board!... I'm just relaying what Tim wrote in the specs.... but ally is LIGHT and STRONG!..... but no good for mass/fast production (no moulds).
I'm liking this boat design much more now that you've explained it. I'm still not sure what the difference in weight is between yours and a Schionning Arrow 1360 and if your boat is the same width and mast height as the Schionning Arrow 1360. Everything I talk about is focused around the Schionning Arrow 1360 because I saw a TH-cam video about it and the boat name is Duet. It's such a beautiful boat and has a curved front cross bar which gives it sex appeal. I also love the deck house design and the hard cover design over the transom helm position. Your boat has some of these great qualities and I'm basically looking for some comparisons because I can't afford a Schionning Arrow 1360 unless I start a TH-cam video channel like you :)
Haha.. That won't help you... Unless you have bikini girls on every thumbnail.
Brave man balsa core never seen one that did not get water ingress.
@@joeblaney684 Now I only want to go with an aluminum cat but need to learn how to weld because Tim Mumby is swamped with orders and has a waiting list a mile long. I spoke with the Schionning team about seeing if they can send me plans and CNC cut files for an aluminum build. I'm not sure if they are willing to do that yet but we shall see. If not than I'm going to build a Mumby Cyber 48 or 50.
@@robertlaird6746 avoid balsa core high quality density foam cored composite works well too
@@joeblaney684 I'm going with aluminum for sure after I've watched every one of Sailing Life on Jupiter's videos. I've even changed my mind on being dead set on a galley up design to now wanting a galley down. The aluminum has many more advantages than any other material including price which is a very large factor for me. I will make a curved front cross beam and have the anchor up front and have a fixed spinnaker pole. I'll also make my own carbon boom with wings to hold the main sail. I'm not sure if there might be a better design than the Mumby kick up rudder system but I'll think about it. Now I just need to learn how to weld.
Thanks for this guys! Small thing; what do you think about the practicalities of raising the dinette/settee area on a platform by some inches to allow easier vision when seated? I'm not too tall and I notice the windows seem to be a little above you guys when you are seated.
Hiya Neville.. Shouldn't be a problem.. Even fatter upholstery would work!
@@SailingLifeonJupiter (This is my first comment on your videos- you are beginning to make me think I will be saving up for a Mumby!) Fatter upholstery would certainly raise *nevillesax* enough to see out the windows but as a woodworker furniture builder, I can tell you that you just can't change one dimension without affecting another. If the seat is higher, a shorter person, like my 5 foot tall wife, would have a hard time getting up onto the cushion. Then once up on it, they would be uncomfortable with their feet dangling for any length of time. I think a better solution would be to have part of the floor raised, if not the entire floor. Maybe some storage could be incorporated below? It would obviously lower the clearance for headroom in that area but, that may not be a problem for those requesting the modification!? Many Cats I have seen have a raised floor under the saloon table/seating.
Very go, Thank you.
Cheers Michael
Awesome discussion! I'm studying catamaran design and learned that a fractional rig such as the Cyber will have a lot of weather helm when the rig COE (center of effort) is aft of the CLR (center of lateral resistance). Looking at Jupiter, the daggerboards look pretty well aligned with the mast so presumably the normal COE would be aft of the mast. Does Jupiter have excessive weather helm? And if so, do the rudders cause the boat to slow down while overcoming it? Sorry for the geek question but I'm trying to figure out a sail plan and autopilot requirement for a boat with the same sort of underwater profile as Jupiter.
atomvoyages.com eliminated weather helm on his 28 ft Pearson Triton sloop by shortening the mast 1.5 feet and making the formerly fractional jib a masthead jib rig. Now the helm is balanced.
Hey Brian... it can do on occasion, depending on the weather/angle... but it just means you need to balance the sail plan, according to the conditions.... it would indicate that the main is overpowered and needs a reef... or the other extreme is more headsal required...screacher!.... and fur sure, if you're holding too much weather helm, you're just dragging your rudders.
So would you recommend a main with a lot of roach that might be too powerful or an ordinary point sail? I realize it depends on conditions. In light winds I assume you could reach with the main and code zero?
There is a mumby 48 for sale in phuket
Yep.. Thats an oldie!
@@SailingLifeonJupiter the first one
What about a gen set and AC. I am spoiled and I need AC at least in my sleeping cabin. The tropics can be very muggy when trying to sleep. I have used the sailing small water force gen sets on the stern to charge batteries without solar but is there or could there be a dedicated space for a small diesel gen set?
Sure.. There's a big locker forward of the mast... I keep all my dive tanks, compressor and sails in there..
A 4 year build Ouch! So glad that you stuck it out You have a great boat and are living your best life.
Cheers Ed
Thanks for the video!
Tks for the thanks Alexander
How can I book a Consultation with you?
Please email us on Svjupiter2@gmail.com
Very interesting to learn a lot. Plus, your moderator is cute as a button. Makes me want to get back to the Islands from Florida as soon as restrictions are gone! In the vid clip of the bouncing: My thought was how Galant the lady cut through the water. It is as if she is slicing the waves not pushing them out of the way.
She is, isn't she... Tks MrBuzz
@@SailingLifeonJupiter Yes, and that applies to both the Lady & the Boat! hehe
Great discussion 👍👍
Tks Chad
You guys rock. Yeah first comment
Thanks Keith...Congrats!
based chad
Inner removable forstay , if you had gone that route from the beginning?
Would you to this question what different would you have said make the inner forestay permanent
Because you have to attach the sail, lift by hand its not on a furler .
I got the impression you have leak issues with the water system leaking ,
The genoa gets caught up on the inner forestay when tacking... But we don't really tack that often... (usually avoid going upwind!)... In fact I could just unscrew the turnbuckle and get it out of the way.
So I found that my watermaker pushes air bubbles into my hoses, which are compressable of course...so my pump would run. Now after making water I bleed my water system to remove the air... No more problems!
@@SailingLifeonJupiter as your doing the trades , I didn't think you tack much , it is a back up if the first at fails , have you tried sailing in lighter airs with both,
Thank you great informative video looking forward to the next update.
You just answered a whole lot of questions that I thought of previously but never asked you personally.
😄
Bewdy...tks Carl
I love this
Tks so much!
Groovy man....
Cheers TT
Who did your hay rack on your boom?
I got a guy in Richards Bay to weld it up for me Jay.... love it.
hello, in which country are these catamarans produced?
Philippines my friend... But you could buy the plans and get someone to build it anywhere.
Galvanic isolator??
I am planning to do it in Bangladesh.
Ah cool. Good luck with it
'we got a lot of shit on this boat'
Great video!
Cheers Gary
dont get busted
so how do i get hold of tim to look into a build?
Email me on Svjupiter2@gmail.com and I'll hook you up.
Also, just watced the lobster episode. Anymore lobster since then or was it too traumatic ?
Hehe.... mentally scaring Clarence....
What is that dingy?
A plywood slap together Filipino design.... Still going strong!