The absolute best prop tutorial ever. I kind of understood prop's, but its crystal clear now. Wow Stu, you were on top of your game back in the day, lol.
Just changed my small 9¼ x 10 prop on the Honda 15 due to bogging down at high acceleration, saw your video and heard about the bushings. This solved my problem. Thanks so much
A friend was having trouble with there bass boat not getting up on plane. They took it to several different shops and no one could fix the problem. Finely someone mess with the prop vents and that was the fix. I recently told Frank about your youtube channel and how you helped me with a 2 stroke problem I was having a few years back. And you were the only one that knew what you were talking about. And how you emailed me back and forth and fixed my problem .I told Frank to check out all your videos and there may be one on his boat problem even if you solved it. Keep the videos coming I've watched them all. Thank you for all your boat smarts with we could have a few beers some day if you ever come to northern California please be my gest . Your mate John>-W->
I know this video is already near 3 years old, but i had to pop in to thank you so much for making this video. I really got a great/almost professional sense of props and how they work from this video. I can now choose my prop for my new to me Yamaha f60 with intelligence and understanding. I appreciate you!. Chris from upstate NY.
Chimed in on a the video about relays, fixed that issue and now I am getting some venilation issues. Always know I am gonna learn something when the blackboard is in the background. I blew the motor and bought an identical used one with no prop, bought a super cheap one to get on the water and now I have ventilation issues. Motors mounted in the same spot, cheap prop and cheap hydrofoil are the only new variables to the set up. The hydrofoil has 2 tention screws that hold the hydrofoil to the anti venitlation plate and they stick out pretty far, i would assume they could put a trail of bubbles when underway. Who knows, all I know is there is always something!
@@DangarMarine I always had one on the one that failed but it was attached by holes i drilled thru the vent plate and bolts. Never had an issue. This new motor came with one but it wasn't installed as the motor was on a pallet but its more of a "clip on" style. Slides over the vent plate and then has two fasterner styler bolts that put tention on the vent plate but no holes. I am going to take it off and change the zink to the flate style instead of the skeg lookin like one that hangs from the vent plate.
I took my boat out today it my first boat I have owned just want to say thank you I used a lot of tips i got from watching your videos. Thanks mate keep them coming
I really hope you get the video done on Dangar Island. Every time you have a video outside I always wanted to see more of the island and waterways. Looks beautiful and a place I would love to live. I'm still lucky compared to people living in the a desert area or far from water. I have a 3 minute drive to Lake Pontchartrain and a 30 minute drive to the marshes of Gulf of Mexico for some of the best fishing in the world! Louisiana has great fishing as I'm sure Dangar Island does too. Looking forward to the video!
Brilliant, simple explanation! Went to West Marine in North East United States... as much as I enjoy this facility I've gotten poor, complicated explanations for replacements! My son... the engineer gave me his interpretation, which was fairly understandable...But DANGLER was easy to understand! Where were teachers of this simplicity and caliper years ago! Bravo my friend !! Thanks again for a great, simple video! Well done.... Thanks, Charlie
thanks a lot Stu ... i had a problem that i couldn't identify but now know that.... it is ventilation . I have 5.20 rib with tohatsu 50 long shaft engine (2017) and like to do hard turns when i pull tube or wakeboard . I trimmed almost highest as possible to reach maximum speed (checked before all levels and reach max speed when trimmed all the way up) tomorrow will trim down and will try some hard turns.i tried to buy jack plate to place engine lower on transom but because it is with tiller bit difficult , i have an another option to buy extra long lower unit (can get 7 cm ) but it is quite expensive solution almost 800 usd
Great video once again ....I actually got a 75 starcraft supersport aluminum boat the other day and put a 89 evinrude 40hp on it and had 3 props to choose from and try that I had laying around ....and I can't wait to see your hydro foil video...I have been looking into getting one to try
Hi Stu, Ah a walkabout Island video. Cool can't wait to see it once you get the audio figured out. Great video on props. Nice to know how they work and matching props for usage on the water. I got news this week. Got a sweet job offer from my last job before I retired. It's temporary up to 6 months and we'll worth it so my video projects will be slow coming out for that time period. Looking forward to yours on Sundays with my morning coffee
My prop started to slip this summer, I hammered in and countersunk some nails, equally spaced into the rubber grommet, parallel to the output shaft and the prop has not slipped since. Start with 3 or 4 nails and add more if needed.
It certainly can stop a prop slipping. I think with larger high performance motors the issue of being out of balance comes into play. Also be careful that you don't get stuck out in the middle of nowhere if you hit a rock or something as the nails will fail completely. Good for your gearbox, not so good for getting home!
Great video! Thank you so much. I bought my neighbors boat last summer. A 17ft. Crestliner with a 115hp Evenrude motor. When I go in reverse I have to do at least 3k rpm just to get it to start moving. When going forward it will plane at about 3k rpm but it takes up to 4500 rpm to get any more speed. When it does take off at around 5k rpm it takes off like a bat out of hell and so do the rpm's. I have to throttle back so I don't loose control. I figure it's got to be the pitch of the prop. I welcome any input on this issue.
Great video Stu, it answered a couple of questions I had about cavitation and slippage. Great fun comments f.ex "you might not need to go in a million knots..." 😅. Thanks and rock on .... From Sweden.
Hi Stu, another great informative video. Always wondered what the numbers on the prop meant. Thanks for the education. THANKS FRIEND { from Michigan USA }
I'm was running a 11 1/8" X 13G on my '86' Skeeter Strada f80 w/ my 1985 Yamaha 40 HP, and I had a hard time locating THAT prop. It looks identical to the aluminum one you are holding. I did find a 11 1/2" X 13G and I figure if anything, it's an improvement w/ no harm done. I never thought searching for a prop would be so tough. I had to change out he old one due to dings and nicks from the previous owner.
It can be surprisingly difficult to find the right one, that's for sure. I need to replace the prop on my boat soon so I'm going to use that opportunity to do a vid on prop selection.
excellent explanation, simple, complete, like your style and subscribed, ty for all the information, in theory i know most things you say but since i'm new in boating it really help to see how someone with practical experience approach everything
Excellent video Stu, very informative and clear. Gives me some pointers towards improving a ventilation issue on our club ribs... I'll be very interested to see your doelfin/hydrofoil feature. Thanks again.
Stainless tends to walk away the quickest as you are getting gas or having a bite to eat on the way to the lake you are going to. Have also run into commercial models of very popular outboard like my Yamaha 40 which I didn’t know was a commercial model till I went to replace the prop.
Thanks for the great vid as per usual ,alot of interesting info.Would have been great to see the different props in action on the same boat but you can`t have everything ...
I have a 4 blade prop on my Mercury 60hp Bigfoot and I've noticed that on all four blades the paint has worn off nearly equally in a stripe pattern. I figure this was just normal wear etc. but after watching this I wonder if the cavitation is a factor to it wearing in that way.
Hey Seth, could be caused by normal wear. Commonly it is the tips of the blades that wear the paint off due to being the fastest moving part of the blade and also the part that gets rubbed through sand etc during shallow running.
That's good advice about aluminium propellors being cheaper than stainless steel and better to fit an aluminium propellor. Can you do a video on the Hamilton Jet please?
Very informative Stu ! In my watersking days, I once made the mistake of using too smaller prop pitch. It over-reved and the piston rings shattered. Lesson learnt the hard way ... 🤔 p.s. (Sorry, about Croatia ... France were a bit good though.. )
Thanks mate. I need to get a new prop for the Green Machine soon so I'll grab a few different ones and do a video on coming the top end RPM. Yes, it was a shame to see Croatia lose but they certainly did very well for a country of their size.
Follow up prop vid will be great. In my case there was no rev counter and i just hadn't the experience to realize the engine was red lining by it's screams ...
I'd been spending way too much having aluminum props repaired from damage where I boat, to the point I bought a jet boat. Well, a couple dacades later I bought another boat running an outdrive with a stainless prop and again, I seem to easily discover sand bars but let me tell you, that stainless prop is a heck of a lot tougher.
I AGREE ..ALSO A DECENT REPAIR TECH CAN BANG EM BACK IN SAHPE EASY AND AWAY WE GO....ALUMINUM IS NEVER THE SAME EVER ....60 -75 BUCK A POP FOR ALUM REPAIR ALSO. STAINLESS REPAIR 50-100 BUT THAT STAINLESS WILL BE MUCH HIGHER QUALITY REPAIRED PROP IN SOME CASES BETTER THAN STOCK !
Thanks for this critical information; explained as basically as possible. Much appreciated brother, but I do have a favor if you wouldn’t mind looking at one of my videos and telling me if the carb set up is correct. *I won’t make a habit of it!* I’ll upload it now and see if you don’t mind taking a look sir!
Great explanation of the different types of props. Could you do one on whether its worthwhile fitting a hydrofoil? I have a 4 stroke 40hp on a 4.4m barra boat. Thanks, Andy.
Nice stu, I think the audio problem need to be using a bluetooth or wired microphone that near your shirt, so just mount it on your shirt near your voice should be pretty good, to avoid the wind blocker, something like soft foam wrap on the mic, and it should be very good for voice quality
I have a Rode Film Maker wireless setup, but the microphone cable broke. The mic itself is about $200 so it's taking me a while to be able to afford it. In the meantime I've just bought a fluffy cover for the shot gun mic. When I did that original video on Sunday I had a cheap lapel mic plugged into the Film maker transmitter and it was rubbish unfortunately.
I been searching the interwebs for this prop info, very helpful, subscribed today. Thank you Suggestion for next video- Installing a tachometer for outboard 50hp, trying not to redline my merc classic 50.
Thanks Rob, glad you found the video helpful. I am going to be installing a tacho into my boat soon so I can experiment with a bit of prop selection. My outboard is a 40 HP Honda.
I need to replace the prop on my mid-80's evinrude 50hp. I have a prop that came off of a 1990 Johnson 60hp. The number of spline on both are 13, but the hub housing from the 60hp is about a 1/2 inch bigger in diameter. Nobody ever seems to mention that...I'm not near the motor to check fit, but I'm thinking it's a no go?
It may work in a pinch (maybe something to keep onboard as an emergency spare), but I'd go a prop with the correct hub size if it was me. The hub may also hit the gear casing and be unusable.
I hit some debris once and torn up my prop. I bought a rebuilt prop from the local marina for half the price of a new one. Took the boat out and it was fine at slow speeds; when I'd give it the beans and try to get on plane the engine would break free like it popped out of gear. Assuming the recon prop was good, I was convinced I had broken something else. It took me three weekends to find that it was the hub slipping on the prop; it couldn't hold under higher RPMs. The recon prop obviously had gotten "spun" and the marina didn't change the hub during recon. Got a refund, bought a new one, and lesson learned.
Ha.... not to get off topic here, but my wife learned not to give me the beans or there'd be a lot of something breaking freely. As for the prop... was it that rubber-surround sort of mount like Stu showed in the video? Good to hear that they took it back and refunded your purchase.
Yes, it was the rubber pressed in type of hub. Once it gets spun free one time, it's done for and needs to have a new hub pressed in. Easier to just buy a new prop if that happens.
I agree, especially after just having bought it.... might be a little different if you'd had it for ten years or more before it happened.... There are a few comments around to the effect that driving screws or nails into the rubber puts forces against the spline and the outer ring blah blah blah... but again, since you had just bought the thing, I think it was best handled by taking it straight back where you got it. Kind of a shame that that particular weakness is built into the design, where a material will eventually begin to harden and then lose its bond to a mating surface. Wonder why they continue to make them that way, other than being able to sell more replacements....
I'm not sure if it is built in redundancy as such, because I've certainly got many, many years out of a rubber bushed prop. I can also see that they are more user friend to your average boater as you don't need to do anything if you hit the prop on something, just keep going provided it didn't fracture a blade or something serious. On the other hand, I really like the idea of being able to repair the old shear pin design but that might just be me. :)
Been waiting for this explanation for a while mate...recently got my new outboard mounted and "propped" for my old hull..I really need a hydrofoil to avoid that ventilation as it not good for the outboard obviously and also it freaks everyone out !. I have also had some of the paint come off in the middle of the blades already...seems a bit strange ? Mine is set to max rev@ 5500rpm and does 47 km/h or 25 knots flat stick. it's a 40 Yammie 2 stroke and is mounted fairly high so trimming is precarious.. think I will buy that hydrofoil for Christmas.. Cheers mate
Is the motor mounted above the transom height or flat down on it? If I was getting ventilation I would lower it if possible. If that's not possible, a hydrofoil is worth a try for sure.
They specifically mounted it above the transom down at Brooklyn..goes really well .. I think it's me getting carried away with trimming up sometimes but I will be adding the foil for sure..cheers mate
Lyndhurst NJ is a few towns over from where I live. Hey Angelo, I live in nearby Secaucus! Great video on props Stu. I think props in general are a mystery to most boaters. There’s a lot going on with a prop than most people realize.
hi dangar loving your videos, is there any chance you could perhaps do a gel coat touch up / repaint vid one day? i also had a conversation with a fellow boatee in my town about his boat having electrosis( I think thats how it is said) any light you could share on this?
Ah, yes, must do a video on both one day. With the electrolysis, he needs to be aware of any stray current passing through the boat and make sure he has good anodes attached.
Thanks Stu for another great video! My instructor and I were just talking about propping a few days ago in class. We reviewed a lot of the same information you provided in our new Yamaha textbook. Hopefully I can get one of your T-shirts soon and send a picture from our school!
Stu I think a cool video would be is to put 2 or maybe even 3 different pitch props on the green machine and show the difference in rpm, how fast it planes, and top speed
Nice video. However cavitation is not due to "gases inte the water" its simply water that due to low local preassure makes into water vapour. Also - that the temperature for a propeller running in water will be hight enoug to cause aluminium to fail is unlikey. Generellt creep, a very slow process, is risky over 0.6 x the melting point for metals. The rubber bushing might however get hot by vibration etc..? Thanks for your videos - generally very interesting!
i wager that freezing the bushing, warming the prop and using silicone lubricant would make bushings easier to replace. process used in automotive applications
Believe it or not in the 70's I worked for one of the biggest prop repair shops on the east coast and they would would heat up Karo cooking syrup with a torch in a small pan until it boiled and used that as a lube to press in those cushioned hubs on props.
Ty you again for your videos. At this point I have fixed all that was wrong with my boat with your help. I have an 89' Johnson 40hp that was doing great until I went wide around a buoy and ran It through the shallows. It sucked muck clean through the new water pump. Flushed and all's good now but I've managed to loss the plastic ring off the prop. How important is this ring to the function. I don't run it wide open often but have been going out on large lakes that require full speed to get around on. I do understand it does something with the through hub exhaust and flow. I've noticed that they have gone away from this ring and just have a flared end now. Just not sure what to do at this point. TY for any help you can give in this matter.
I wouldn't be too worried about the ring. You are right that it is about taking the exhaust away from the prop blades but so long as you aren't hearing the boat over rev I wouldn't be too worried.
That's what I was worried about. It does seem to rev out under heavy throttle at odd times now. Always while trying to get on plane. Kinda like the prop completely looses resistance under thrust. I've had this happen when its choppy water but never when its smooth running first thing in the morning until now. Sounds like its creating a gas bubble around the prop causing my issue now. Guess I need to look at getting a new ring or prop. Ty for your help.
Hey Stu, at the start of this great vid you are demonstrating a prop spinning as it goes through the water. It appears it's spinning in reverse, is Johnny going nuts? OCD, OCD, to be or not to be...
The absolute best prop tutorial ever. I kind of understood prop's, but its crystal clear now. Wow Stu, you were on top of your game back in the day, lol.
Just changed my small 9¼ x 10 prop on the Honda 15 due to bogging down at high acceleration, saw your video and heard about the bushings. This solved my problem. Thanks so much
A friend was having trouble with there bass boat not getting up on plane. They took it to several different shops and no one could fix the problem. Finely someone mess with the prop vents and that was the fix. I recently told Frank about your youtube channel and how you helped me with a 2 stroke problem I was having a few years back. And you were the only one that knew what you were talking about. And how you emailed me back and forth and fixed my problem .I told Frank to check out all your videos and there may be one on his boat problem even if you solved it. Keep the videos coming I've watched them all. Thank you for all your boat smarts with we could have a few beers some day if you ever come to northern California please be my gest . Your mate John>-W->
Well made video!!! Pure explantion with details but easy details to remember...i could listen to this guy talk all day and learn!!!
This is THE BEST channel for any marine knowledge I need, thank you for your time!
I know this video is already near 3 years old, but i had to pop in to thank you so much for making this video. I really got a great/almost professional sense of props and how they work from this video. I can now choose my prop for my new to me Yamaha f60 with intelligence and understanding. I appreciate you!. Chris from upstate NY.
You're very welcome!
This is the best presentation I have seen on cavitation and ventilation--words we here a lot but are often a little fuzzy on. Thank you.
Great video. I'm an old Marine Engineer. I actually learned some things I didn't know. Thank you.
Glad you enjoyed it
Thanks Stew I finally have a clue on props after being a boat owner for 15 years!!!Super informative!!
Thanks Mike, glad you liked the vid.
Chimed in on a the video about relays, fixed that issue and now I am getting some venilation issues. Always know I am gonna learn something when the blackboard is in the background. I blew the motor and bought an identical used one with no prop, bought a super cheap one to get on the water and now I have ventilation issues. Motors mounted in the same spot, cheap prop and cheap hydrofoil are the only new variables to the set up. The hydrofoil has 2 tention screws that hold the hydrofoil to the anti venitlation plate and they stick out pretty far, i would assume they could put a trail of bubbles when underway. Who knows, all I know is there is always something!
Did the boat have a problem before you added the hydrofoil? If it did they can really help, but if it didn't they can make a boat much worse.
@@DangarMarine I always had one on the one that failed but it was attached by holes i drilled thru the vent plate and bolts. Never had an issue. This new motor came with one but it wasn't installed as the motor was on a pallet but its more of a "clip on" style. Slides over the vent plate and then has two fasterner styler bolts that put tention on the vent plate but no holes. I am going to take it off and change the zink to the flate style instead of the skeg lookin like one that hangs from the vent plate.
I took my boat out today it my first boat I have owned just want to say thank you I used a lot of tips i got from watching your videos. Thanks mate keep them coming
Nice one Samo, glad you hear you are getting out on the water now. May you have many years of safe fun in your new boat! :)
Brilliant explanation. Thanks for taking the time to make and post this video Stu.
Excellent explanation of props.
Glad it was helpful!
All your videos are awesome, real life, no BS!
Even now that I own a jetski, I still love your content!
Great video as usual. And yes, a very clear explanation. We all now understand propellers.
Except for that 1 guy, we all know him
Every day I find a new post that answers my questions. Thanks for all the effort.
You're welcome. :)
I have learned so much from your videos mate, I can not thank you enough! Great channel!
Finally i understand how the props work, thank you. Awesome video
Thanks Brian!
Thank You Sir! You answered questions I didn't even know I had.
thanx stu lots of good info. as you get ready for a great summer we are all about getting that last one in before the winterization starts.
Thanks mate. Enjoy the sunshine while it lasts!
excellent,i have learnt a bit more about props.i was not too sure mine was right for the job but now it looks as though it will be ok.
cheers.
It's always good to find out the one you have is the one you need!
I really hope you get the video done on Dangar Island. Every time you have a video outside I always wanted to see more of the island and waterways. Looks beautiful and a place I would love to live. I'm still lucky compared to people living in the a desert area or far from water. I have a 3 minute drive to Lake Pontchartrain and a 30 minute drive to the marshes of Gulf of Mexico for some of the best fishing in the world! Louisiana has great fishing as I'm sure Dangar Island does too. Looking forward to the video!
Hey Jim, I'll definitely get it don't this summer. Would love to go fishing in Louisiana one day!
Definitely not boring but I now have a headache, damn so much to learn, your a great teacher
Thanks Adrien, hope you head feels better soon!
On my Honda 30HP I just changed from Factory 9 1/2" x 12" to a SOLAS 9.9" x 10", it has gone from a slug to a star !
Interesting to hear that. It's good to collect these experiences and find out what worked and what didn't.
Another great video, thanks from Canada, Our water is now turning hard (ice) .Looking forward to next year
Thanks Kim. Hopefully our summer boating videos will help get you through the winter. :)
I have to say that your videos and info is just so great and always extremely informative .👍👍👍👍keep them coming
Thanks mate!
Thanks Stu you've answered a couple questions I had about props.
You're welcome John, great to hear.
Brilliant, simple explanation! Went to West Marine in North East United States... as much as I enjoy this facility I've gotten poor, complicated explanations for replacements! My son... the engineer gave me his interpretation, which was fairly understandable...But DANGLER was easy to understand! Where were teachers of this simplicity and caliper years ago! Bravo my friend !! Thanks again for a great, simple video! Well done.... Thanks, Charlie
Thanks Charlie, really glad to hear it made sense! :)
Very nice video ! New boatman here, would love to see a comparison done on a boat - with three different props to understand it more.
thanks a lot Stu ... i had a problem that i couldn't identify but now know that.... it is ventilation . I have 5.20 rib with tohatsu 50 long shaft engine (2017) and like to do hard turns when i pull tube or wakeboard . I trimmed almost highest as possible to reach maximum speed (checked before all levels and reach max speed when trimmed all the way up) tomorrow will trim down and will try some hard turns.i tried to buy jack plate to place engine lower on transom but because it is with tiller bit difficult , i have an another option to buy extra long lower unit (can get 7 cm ) but it is quite expensive solution almost 800 usd
It's amazing how much higher the prop rides during a turn, sounds like you're onto the problem.
This made a lot of sense to me. looking forward to the hydrofoil ep.
Thanks mate!
Great video once again ....I actually got a 75 starcraft supersport aluminum boat the other day and put a 89 evinrude 40hp on it and had 3 props to choose from and try that I had laying around ....and I can't wait to see your hydro foil video...I have been looking into getting one to try
Thanks mate, hoping to film it tomorrow for next weekend.
wow what a treasure I've found! Thank you!
Awesome. i learn more when i can see it in diagrams. This has helped me understand. Im new to boating.
Hi Stu, Ah a walkabout Island video. Cool can't wait to see it once you get the audio figured out. Great video on props. Nice to know how they work and matching props for usage on the water. I got news this week. Got a sweet job offer from my last job before I retired. It's temporary up to 6 months and we'll worth it so my video projects will be slow coming out for that time period. Looking forward to yours on Sundays with my morning coffee
Thanks Tim, congrats on the new job. I know the feeling about trying to find time for videos and working. It's been killing me lately!
My prop started to slip this summer, I hammered in and countersunk some nails, equally spaced into the rubber grommet, parallel to the output shaft and the prop has not slipped since. Start with 3 or 4 nails and add more if needed.
It certainly can stop a prop slipping. I think with larger high performance motors the issue of being out of balance comes into play. Also be careful that you don't get stuck out in the middle of nowhere if you hit a rock or something as the nails will fail completely. Good for your gearbox, not so good for getting home!
Great video! Thank you so much. I bought my neighbors boat last summer. A 17ft. Crestliner with a 115hp Evenrude motor. When I go in reverse I have to do at least 3k rpm just to get it to start moving. When going forward it will plane at about 3k rpm but it takes up to 4500 rpm to get any more speed. When it does take off at around 5k rpm it takes off like a bat out of hell and so do the rpm's. I have to throttle back so I don't loose control. I figure it's got to be the pitch of the prop. I welcome any input on this issue.
At last a simple explanation
Thanks mate, glad it made sense!
Great video! Thanks for all the information and keeping it simple!
Great video Stu, it answered a couple of questions I had about cavitation and slippage. Great fun comments f.ex "you might not need to go in a million knots..." 😅. Thanks and rock on .... From Sweden.
Thanks Michael, I was exaggerating, you often only need about 900,000 knots... ;)
Hi Stu, another great informative video. Always wondered what the numbers on the prop meant. Thanks for the education. THANKS FRIEND { from Michigan USA }
You're welcome Ronald, glad the video helped.
I'm was running a 11 1/8" X 13G on my '86' Skeeter Strada f80 w/ my 1985 Yamaha 40 HP, and I had a hard time locating THAT prop. It looks identical to the aluminum one you are holding. I did find a 11 1/2" X 13G and I figure if anything, it's an improvement w/ no harm done. I never thought searching for a prop would be so tough. I had to change out he old one due to dings and nicks from the previous owner.
It can be surprisingly difficult to find the right one, that's for sure. I need to replace the prop on my boat soon so I'm going to use that opportunity to do a vid on prop selection.
Great video, well done and what I’ve been looking for, much appreciated. Cheers
Thanks for your video tutorials I've learned so much !
Thanks mate, glad you've been enjoying them. :)
Clear. Concise. Very understandable. Thanks
Your drawings are very good by the way!!
excellent explanation, simple, complete, like your style and subscribed, ty for all the information, in theory i know most things you say but since i'm new in boating it really help to see how someone with practical experience approach everything
Very informative and clear information, good job. 👍🏻👍🏻👍🏻
Thanks mate!
Excellent video Stu, very informative and clear. Gives me some pointers towards improving a ventilation issue on our club ribs... I'll be very interested to see your doelfin/hydrofoil feature. Thanks again.
Thanks Duncan, glad you liked the vid. :)
good informative video. Thks for showing the prop selector. good to know.
You're welcome Tyson. :)
Wow thanks for that info! I finally understand props a lot better. I recommend your channel a lot!
always learning something new and useful from your channel Stew . good onya mate.
Hi I live in Suirname and we have some small motors pushing heavy loads like a excavator getting pushed on a 40hp outboard!
In the same boat, we used diesel outboard the speed of only 9 knots, replacing Yamaha's gasoline outboard the speed up to 18 knots.
Great illustration
Thank You Sir!!! Very Very good video!!! I learned Alot!!!
Stainless tends to walk away the quickest as you are getting gas or having a bite to eat on the way to the lake you are going to. Have also run into commercial models of very popular outboard like my Yamaha 40 which I didn’t know was a commercial model till I went to replace the prop.
I was going to mention that stainless props do tend to be the target of thieves. No one ever seems to steal my dinged up aluminium prop...
Dangar Marine or my badly painted stainless prop. Learned that one from another boater.
I like your channel a lot..very educative and helpful.. Thumbs up from Montreal.
Thanks Mina! :)
Great introduction to the topic, keep up with the great work!!
THanks mate. :)
Thanks for the great vid as per usual ,alot of interesting info.Would have been great to see the different props in action on the same boat but you can`t have everything ...
One day I would like to try a few different props on the Green Machine so I'll definitely film that.
Look foward to that ..!
Outstanding video very informative and explained very well thank you
Thanks mate!
I have a 4 blade prop on my Mercury 60hp Bigfoot and I've noticed that on all four blades the paint has worn off nearly equally in a stripe pattern. I figure this was just normal wear etc. but after watching this I wonder if the cavitation is a factor to it wearing in that way.
Hey Seth, could be caused by normal wear. Commonly it is the tips of the blades that wear the paint off due to being the fastest moving part of the blade and also the part that gets rubbed through sand etc during shallow running.
@@DangarMarine IN MY EXPERIENCE THOSE "BURN" MARKS IN THE PAINT DO COME FROM CAV BUBBLES .....40 YEARS OF PLAYING BOATS IVE SEEN A FEW THINGS!
Interesting indeed, you should teach future mariners, mechanic and boat enthusiast.
That's good advice about aluminium propellors being cheaper than stainless steel and better to fit an aluminium propellor. Can you do a video on the Hamilton Jet please?
Thanks mate. I've never seen a Hamilton Jet which is going to make doing a video difficult unfortunately.
Very informative Stu ! In my watersking days, I once made the mistake of using too smaller prop pitch. It over-reved and the piston rings shattered. Lesson learnt the hard way ... 🤔 p.s. (Sorry, about Croatia ... France were a bit good though.. )
Thanks mate. I need to get a new prop for the Green Machine soon so I'll grab a few different ones and do a video on coming the top end RPM. Yes, it was a shame to see Croatia lose but they certainly did very well for a country of their size.
Follow up prop vid will be great. In my case there was no rev counter and i just hadn't the experience to realize the engine was red lining by it's screams ...
Excellent presentation!
thanks Stu this was really helpful
You're welcome. :)
You should make a video on how to true a prop. I did it in school and there were no videos about it. Would possibly be a good one to do
Sounds like a good idea, I'll look into it.
I'd been spending way too much having aluminum props repaired from damage where I boat, to the point I bought a jet boat. Well, a couple dacades later I bought another boat running an outdrive with a stainless prop and again, I seem to easily discover sand bars but let me tell you, that stainless prop is a heck of a lot tougher.
I AGREE ..ALSO A DECENT REPAIR TECH CAN BANG EM BACK IN SAHPE EASY AND AWAY WE GO....ALUMINUM IS NEVER THE SAME EVER ....60 -75 BUCK A POP FOR ALUM REPAIR ALSO. STAINLESS REPAIR 50-100 BUT THAT STAINLESS WILL BE MUCH HIGHER QUALITY REPAIRED PROP IN SOME CASES BETTER THAN STOCK !
Thanks for this critical information; explained as basically as possible. Much appreciated brother, but I do have a favor if you wouldn’t mind looking at one of my videos and telling me if the carb set up is correct.
*I won’t make a habit of it!* I’ll upload it now and see if you don’t mind taking a look sir!
Great explanation of the different types of props. Could you do one on whether its worthwhile fitting a hydrofoil? I have a 4 stroke 40hp on a 4.4m barra boat. Thanks, Andy.
Ah, you didn't watch to the end, did you? ;) Yep, that is one of the next things I'm going to be experimenting with on the Green Machine.
Great expatiation on props. Thank you
Thanks Thomas, glad you liked it. :)
Nice stu, I think the audio problem need to be using a bluetooth or wired microphone that near your shirt, so just mount it on your shirt near your voice should be pretty good, to avoid the wind blocker, something like soft foam wrap on the mic, and it should be very good for voice quality
I have a Rode Film Maker wireless setup, but the microphone cable broke. The mic itself is about $200 so it's taking me a while to be able to afford it. In the meantime I've just bought a fluffy cover for the shot gun mic. When I did that original video on Sunday I had a cheap lapel mic plugged into the Film maker transmitter and it was rubbish unfortunately.
good equipment, I saw you always put something in front of the camera but it still can focus very quick, what camera you using? Thanks.
It's a Panasonic HC-V770.
I been searching the interwebs for this prop info, very helpful, subscribed today.
Thank you
Suggestion for next video- Installing a tachometer for outboard 50hp, trying not to redline my merc classic 50.
Thanks Rob, glad you found the video helpful. I am going to be installing a tacho into my boat soon so I can experiment with a bit of prop selection. My outboard is a 40 HP Honda.
Brilliant explanations! Thank you.
You’re welcome. :)
fabulous video Mate!
Thanks Josef!
I was looking forward to this topic. Great video as always!!!
Thanks Sean.
Simple and straight forward explainaton thanks!!
Thanks mate, glad you liked it.
Great video as usual. Thanks
Thanks Doug.
Loving all of your vids
Awesome vid Stu................I've been waiting for you to cover this topic.
Thanks heaps mate, great info :)
Thanks Ron, glad you liked it. :)
I need to replace the prop on my mid-80's evinrude 50hp. I have a prop that came off of a 1990 Johnson 60hp. The number of spline on both are 13, but the hub housing from the 60hp is about a 1/2 inch bigger in diameter. Nobody ever seems to mention that...I'm not near the motor to check fit, but I'm thinking it's a no go?
It may work in a pinch (maybe something to keep onboard as an emergency spare), but I'd go a prop with the correct hub size if it was me. The hub may also hit the gear casing and be unusable.
That’s the best explanation of prop’s Ive ever seen! (and the drawing was great! :-) best regards from Sweden!
Great information Stu.
Thanks Will! :)
I hit some debris once and torn up my prop. I bought a rebuilt prop from the local marina for half the price of a new one. Took the boat out and it was fine at slow speeds; when I'd give it the beans and try to get on plane the engine would break free like it popped out of gear. Assuming the recon prop was good, I was convinced I had broken something else. It took me three weekends to find that it was the hub slipping on the prop; it couldn't hold under higher RPMs. The recon prop obviously had gotten "spun" and the marina didn't change the hub during recon. Got a refund, bought a new one, and lesson learned.
Ha.... not to get off topic here, but my wife learned not to give me the beans or there'd be a lot of something breaking freely. As for the prop... was it that rubber-surround sort of mount like Stu showed in the video? Good to hear that they took it back and refunded your purchase.
Yes, it was the rubber pressed in type of hub. Once it gets spun free one time, it's done for and needs to have a new hub pressed in. Easier to just buy a new prop if that happens.
I agree, especially after just having bought it.... might be a little different if you'd had it for ten years or more before it happened.... There are a few comments around to the effect that driving screws or nails into the rubber puts forces against the spline and the outer ring blah blah blah... but again, since you had just bought the thing, I think it was best handled by taking it straight back where you got it. Kind of a shame that that particular weakness is built into the design, where a material will eventually begin to harden and then lose its bond to a mating surface. Wonder why they continue to make them that way, other than being able to sell more replacements....
I'm not sure if it is built in redundancy as such, because I've certainly got many, many years out of a rubber bushed prop. I can also see that they are more user friend to your average boater as you don't need to do anything if you hit the prop on something, just keep going provided it didn't fracture a blade or something serious. On the other hand, I really like the idea of being able to repair the old shear pin design but that might just be me. :)
Been waiting for this explanation for a while mate...recently got my new outboard mounted and "propped" for my old hull..I really need a hydrofoil to avoid that ventilation as it not good for the outboard obviously and also it freaks everyone out !. I have also had some of the paint come off in the middle of the blades already...seems a bit strange ? Mine is set to max rev@ 5500rpm and does 47 km/h or 25 knots flat stick. it's a 40 Yammie 2 stroke and is mounted fairly high so trimming is precarious.. think I will buy that hydrofoil for Christmas.. Cheers mate
Just checked prop..it's a 11 5/8 x 11 - G
Is the motor mounted above the transom height or flat down on it? If I was getting ventilation I would lower it if possible. If that's not possible, a hydrofoil is worth a try for sure.
They specifically mounted it above the transom down at Brooklyn..goes really well .. I think it's me getting carried away with trimming up sometimes but I will be adding the foil for sure..cheers mate
Lyndhurst NJ is a few towns over from where I live. Hey Angelo, I live in nearby Secaucus! Great video on props Stu. I think props in general are a mystery to most boaters. There’s a lot going on with a prop than most people realize.
Ha! You guys should have a local meet up and go fishing together! :) You're not wrong about props, they are a lot more complicated than they seem.
Great video very informative
Thanks Jeff. :)
A great example for how a prop works just like my airplane thanks
hi dangar loving your videos, is there any chance you could perhaps do a gel coat touch up
/ repaint vid one day? i also had a conversation with a fellow boatee in my town about his boat having electrosis( I think thats how it is said) any light you could share on this?
Ah, yes, must do a video on both one day. With the electrolysis, he needs to be aware of any stray current passing through the boat and make sure he has good anodes attached.
cheers mate i will let him know, have referred him to this channel =) cheers again.
Same here Stu just bought a 100hp EFI mariner And was wondering where to start about the prop
I would put in all your details into that SOLAS prop selector I showed and see what it says.
Thanks Stu for another great video! My instructor and I were just talking about propping a few days ago in class. We reviewed a lot of the same information you provided in our new Yamaha textbook. Hopefully I can get one of your T-shirts soon and send a picture from our school!
Thanks mate. Looking forward to seeing your photo at the school. Good luck with your course!
Stu I think a cool video would be is to put 2 or maybe even 3 different pitch props on the green machine and show the difference in rpm, how fast it planes, and top speed
Definitely planning to do this vid soon. :)
Nice video. However cavitation is not due to "gases inte the water" its simply water that due to low local preassure makes into water vapour. Also - that the temperature for a propeller running in water will be hight enoug to cause aluminium to fail is unlikey. Generellt creep, a very slow process, is risky over 0.6 x the melting point for metals. The rubber bushing might however get hot by vibration etc..?
Thanks for your videos - generally very interesting!
i wager that freezing the bushing, warming the prop and using silicone lubricant would make bushings easier to replace. process used in automotive applications
Believe it or not in the 70's I worked for one of the biggest prop repair shops on the east coast and they would would heat up Karo cooking syrup with a torch in a small pan until it boiled and used that as a lube to press in those cushioned hubs on props.
Great video... 👍
Thank you 👍
Good taught me alot thanks you...
My pleasure 😊
Nice. I learn something.
Ty you again for your videos. At this point I have fixed all that was wrong with my boat with your help. I have an 89' Johnson 40hp that was doing great until I went wide around a buoy and ran It through the shallows. It sucked muck clean through the new water pump. Flushed and all's good now but I've managed to loss the plastic ring off the prop. How important is this ring to the function. I don't run it wide open often but have been going out on large lakes that require full speed to get around on. I do understand it does something with the through hub exhaust and flow. I've noticed that they have gone away from this ring and just have a flared end now. Just not sure what to do at this point. TY for any help you can give in this matter.
I wouldn't be too worried about the ring. You are right that it is about taking the exhaust away from the prop blades but so long as you aren't hearing the boat over rev I wouldn't be too worried.
That's what I was worried about. It does seem to rev out under heavy throttle at odd times now. Always while trying to get on plane. Kinda like the prop completely looses resistance under thrust. I've had this happen when its choppy water but never when its smooth running first thing in the morning until now. Sounds like its creating a gas bubble around the prop causing my issue now. Guess I need to look at getting a new ring or prop. Ty for your help.
Hey Stu, at the start of this great vid you are demonstrating a prop spinning as it goes through the water. It appears it's spinning in reverse, is Johnny going nuts? OCD, OCD, to be or not to be...