Hi Charles, yes foiling starts to happen around 7 knots so you quickly jump up to 10 then 13 knots and if there is a good wind then the sky is the limit (well probably 30 knots is the limit). And of course trailing a mulithull is easy because they are so light. I towed my Catri 24 with just an automatic Toyota RAV4. But realistically I needed a bigger car than that so I bought a Land Cruiser Amazon, which could pull a house down! :D
From a performance perspective, what exactly are the benefits of the foils here? the concept page indicates that it allows removal of the centreboard from the main hull but does not explain how stability and speed are achieved when so much of the hull remains wet. The IMOCA 60s are showing how semi foiling hulls can be very quick (stable is fast) but multihulls get a lot of that for free.
Hi Angus, you need to check the Performance page www.ahoy-boats.info/Performance.html if you want to comprehend the performance benefits of the Catri foiling system. The new Catri 25 offers more lift and even better stability than the Catri 24 had but still with the leeward ama in contact with the water, essential if you wish to avoid pitchpoling at high speed.
Hi Stephen , how long does it take to unfold the Catri 25 from its trailer till ready to sail ? Do you have pictures or film how it works ?On the You Tube movie you mention something about canting the mast , what does that mean ? Is it a delicate maneouvre ? Is the Catri 25 easily sailable alone or is 2 persons a required minimum ?
Hi Charles, I don't know how long it takes to unfold from the trailer. It has only been done once, as this is a new boat. And obviously, the very first time that this was done, it was done with exceedingly great care! But let me put it this way. This is not a job you would want to do every day in order to go sailing. The boat is trailerable, yes. And this means you can transport it by road at minimal expense. You can take it home for winter maintenance. You can transport it to far off places for races. But it will take an experienced crew a few hours to do it. I do have video of the first time it was done and there was a big crowd around watching. It was a very big occasion, the launching of this new boat. However, this is not an instructional video. Canting the mast is tilting it sideways so that more sail is exposed to the wind. The boat is designed to heel to leeward a little so that the windward float is out of the water. Normally the mast would then be tilted to leeward also and wind would spill from the sail. The more vertical you can get the mast the more propulsive power is developed. Canting the mast to windward achieves this. Windsurfers always sail with their masts leaning to windward. It is an easy thing to do, as you see in the video, provided that you do it just before you tack, so that the wind is assisting you. I do not know of any other yacht in which this can be done. It is unique, as far as I know. Yes the Catri 25 may be sailed alone by any experienced sailor. Obviously an autohelm would be required and this is easy to fit. The optimium racing crew is probably 3 though.
So now you have to ask the designer to make an easily foldable one that dosen't take up 3 berths in a marina or local harbour. The eternal problem with catamarans and tri-marans unfortunately. Fast but not as spacious as a monohull. For the cruising sailor, fast isn't always better. An interesting concept nonetheless.
@@team3383 The Catri is easy to fold and only then take up the space of a monohull. My first customer used to fold and unfold his Catri 24 every time he went sailing. Once you've done it a few times it becomes second nature.
The hydrofoils do well on flat seas, wind on beam... they can't go fast in 5 ft seas, can foil on close reach though not as well, and on aft winds they wallow in a scarey way.... I pitchpoled my 16 ft Rave.... the downward force in gusts on the bow are never to be underestimated.... they can turn you into a submarine commander really fast...
Please do not tar all foilers with the same brush Wolfpack1254. This comment is a sweeping statement! It relates to your experience of the much inferior Windrider Rave, which has never had a good reputation for stability. Aldis Eglajs designed out the problems that you write of many years ago and the Catri25 is his latest design. The Catri 25 performs well in all seas, in all weathers and at all points of sail. You need to understand that this is a completely different concept to nearly every other foiler that you might encounter out there. Check out www.ahoy-boats.info/CatriConcept.html and other pages on the site. Possibly the most important design feature is that it is not designed to fly above the wave height but to fly with the leeward ama kissing the water the whole time.
You need to check out the web site and all the info I have posted on the Catri concept. If you think that foiling boats need to be flying above the waves you are mistaken. That is courting disaster. The safest way to sail a foiler is with the leeward float actually touching the water all the time. This is how the Catri is designed. Only with this condition is it possible for the leeward float to detect the attitude of the boat and prevent pitchpoling.
+shurppa64 You can expect about 1.5 times the wind speed. The boat has not been fully tested yet but it is clearly faster than the Catri 24 that I had and we got over 20 knots out of her in a Force 4 and 25 kn fully laden in a Force 6.
You have to appreciate that the Catri is not a new idea, though it may be new to you. It is the result of decades of research and development where each design builds upon the experience of previous boats. It's not tlike the boats are unsafe! Quite the opposite in fact. But to discover the full potential of each boat it needs to be sailed in a wide range of conditions. My Catri 24 never put a foot wrong. The 25 is clearly a better boat. I've sailed it and I can tell.
Nice looking boat, but didn't fly, mainly hull foils seemed non existent, and most small lightweight tris can reach 16 knots in light winds. Nice idea, but didn't fly. Pity really. It's normal for windward outrigger to be out, adding windward foils pics just creates drag. Leeward foil didn't do much either...
Ah ha. You missed the point of Aldis's design. It's designed to be safe and fast so the lift is such that the leeward hull maintains constant contact with the water and that is how stability is established and maintained.
Some people thank that foiling boats should fly along above the water entirely. But that is dangerous. The main hull has no foils but the rudder has a big one. If that breaks the surface then the lift it provides is lost and so prevents pitchpole. Similar principle with the foils on the leeward float, which is why it must maintain contact with the water. Fuller explanation at www.ahoy-boats.info/Safety-Stability.html
@@richardjohnholden5104 That's a big'n! Once you fly the main hull you become a monohull, sailing along on the leeward ama. I went to a presentation by a sailor who had sailed around the world in one of the biggest trimarans, if not THE biggest at the time, and he described how the entire crew came up on deck if the main hull came up off the water. It went deadly quiet inside the cabin and they all knew that the next stage would be capsize. Fortunately they did not capsize.
Absolutely. That's part of the design. The leeward ama is always in contact with the water. That's one of the many reasons this boat is so safe, whilst being very fast.
Yes it did but not in this video. There was not enough wind. Check out th-cam.com/video/dVFyXl-GoTQ/w-d-xo.html. But be aware that the design calls for the leeward float to maintain contact with the water at all times. That is one of the many features that makes the Catri design so safe. If you think that for a boat to be foiling it has to be clear of the waves you are mistaken. And boats that foil clear of the waves are only safe until they encounter a wave that it higher than the height at which they are flying. Then they are vulnerable to pitchpole!
look like our traditional boat ... i think this is modern paraw very nice..
Hi Nice looking boat, will you be selling plans? Is there an option for the homebuilder?
+Innes Hutton No, plans will not be sold.
Homebuilding would be impossible
Nice looking and apparently fast . I wonder if easy to foil and transport on a trailer on the road?
Hi Charles, yes foiling starts to happen around 7 knots so you quickly jump up to 10 then 13 knots and if there is a good wind then the sky is the limit (well probably 30 knots is the limit). And of course trailing a mulithull is easy because they are so light. I towed my Catri 24 with just an automatic Toyota RAV4. But realistically I needed a bigger car than that so I bought a Land Cruiser Amazon, which could pull a house down! :D
can u beach this? like just drag up a beach, or foils will get in a way? seems not subtractable
Yes you can. The foils are retractable.
I like boat nice ...
From a performance perspective, what exactly are the benefits of the foils here? the concept page indicates that it allows removal of the centreboard from the main hull but does not explain how stability and speed are achieved when so much of the hull remains wet. The IMOCA 60s are showing how semi foiling hulls can be very quick (stable is fast) but multihulls get a lot of that for free.
Hi Angus, you need to check the Performance page www.ahoy-boats.info/Performance.html if you want to comprehend the performance benefits of the Catri foiling system. The new Catri 25 offers more lift and even better stability than the Catri 24 had but still with the leeward ama in contact with the water, essential if you wish to avoid pitchpoling at high speed.
Hi Stephen , how long does it take to unfold the Catri 25 from its trailer till ready to sail ? Do you have pictures or film how it works ?On the You Tube movie you mention something about canting the mast , what does that mean ? Is it a delicate maneouvre ? Is the Catri 25 easily sailable alone or is 2 persons a required minimum ?
Hi Charles, I don't know how long it takes to unfold from the trailer. It has only been done once, as this is a new boat. And obviously, the very first time that this was done, it was done with exceedingly great care! But let me put it this way. This is not a job you would want to do every day in order to go sailing. The boat is trailerable, yes. And this means you can transport it by road at minimal expense. You can take it home for winter maintenance. You can transport it to far off places for races. But it will take an experienced crew a few hours to do it. I do have video of the first time it was done and there was a big crowd around watching. It was a very big occasion, the launching of this new boat. However, this is not an instructional video. Canting the mast is tilting it sideways so that more sail is exposed to the wind. The boat is designed to heel to leeward a little so that the windward float is out of the water. Normally the mast would then be tilted to leeward also and wind would spill from the sail. The more vertical you can get the mast the more propulsive power is developed. Canting the mast to windward achieves this. Windsurfers always sail with their masts leaning to windward. It is an easy thing to do, as you see in the video, provided that you do it just before you tack, so that the wind is assisting you. I do not know of any other yacht in which this can be done. It is unique, as far as I know. Yes the Catri 25 may be sailed alone by any experienced sailor. Obviously an autohelm would be required and this is easy to fit. The optimium racing crew is probably 3 though.
So now you have to ask the designer to make an easily foldable one that dosen't take up 3 berths in a marina or local harbour. The eternal problem with catamarans and tri-marans unfortunately. Fast but not as spacious as a monohull. For the cruising sailor, fast isn't always better.
An interesting concept nonetheless.
@@team3383 The Catri is easy to fold and only then take up the space of a monohull. My first customer used to fold and unfold his Catri 24 every time he went sailing. Once you've done it a few times it becomes second nature.
The hydrofoils do well on flat seas, wind on beam... they can't go fast in 5 ft seas, can foil on close reach though not as well, and on aft winds they wallow in a scarey way.... I pitchpoled my 16 ft Rave.... the downward force in gusts on the bow are never to be underestimated.... they can turn you into a submarine commander really fast...
Please do not tar all foilers with the same brush Wolfpack1254. This comment is a sweeping statement! It relates to your experience of the much inferior Windrider Rave, which has never had a good reputation for stability. Aldis Eglajs designed out the problems that you write of many years ago and the Catri25 is his latest design. The Catri 25 performs well in all seas, in all weathers and at all points of sail. You need to understand that this is a completely different concept to nearly every other foiler that you might encounter out there. Check out www.ahoy-boats.info/CatriConcept.html and other pages on the site. Possibly the most important design feature is that it is not designed to fly above the wave height but to fly with the leeward ama kissing the water the whole time.
Will they come out with something bigger for cruising? I am thinking around 12m or more.
Unlikely. Such boats can be designed and built but the market is small and the ROI inadequate.
maybe a dragonfly 32 or so would do but they dont fly
Now you can order a CATRI 36 🙂 as a one off. I'll be putting out more info on this boat soon.
Excuse me but I didn’t see the foil rising opposite side of the wind. I’m just another trimaran buyer searching for the holy grail foil!
You need to check out the web site and all the info I have posted on the Catri concept. If you think that foiling boats need to be flying above the waves you are mistaken. That is courting disaster. The safest way to sail a foiler is with the leeward float actually touching the water all the time. This is how the Catri is designed. Only with this condition is it possible for the leeward float to detect the attitude of the boat and prevent pitchpoling.
Waiting for the Catri 37,38, or 39 to Come out....
Small tri's - small problems . Big tri's big problems. With this speed you play with powers that you don't wat to make it bigger.
Aldis is currently working on the design of a Catri 36.
You can now order a Catri 36 🙂
What will it do in 15 to 20 kt winds
+shurppa64 You can expect about 1.5 times the wind speed. The boat has not been fully tested yet but it is clearly faster than the Catri 24 that I had and we got over 20 knots out of her in a Force 4 and 25 kn fully laden in a Force 6.
Stephen Walker Your selling these on the open market and they have not been fully tested yet ?
You have to appreciate that the Catri is not a new idea, though it may be new to you. It is the result of decades of research and development where each design builds upon the experience of previous boats. It's not tlike the boats are unsafe! Quite the opposite in fact. But to discover the full potential of each boat it needs to be sailed in a wide range of conditions. My Catri 24 never put a foot wrong. The 25 is clearly a better boat. I've sailed it and I can tell.
Nice looking boat, but didn't fly, mainly hull foils seemed non existent, and most small lightweight tris can reach 16 knots in light winds. Nice idea, but didn't fly. Pity really. It's normal for windward outrigger to be out, adding windward foils pics just creates drag. Leeward foil didn't do much either...
Ah ha. You missed the point of Aldis's design. It's designed to be safe and fast so the lift is such that the leeward hull maintains constant contact with the water and that is how stability is established and maintained.
Why would you want leeward hull constant contact, it would always be constant contact, bizarre comment
Some people thank that foiling boats should fly along above the water entirely. But that is dangerous. The main hull has no foils but the rudder has a big one. If that breaks the surface then the lift it provides is lost and so prevents pitchpole. Similar principle with the foils on the leeward float, which is why it must maintain contact with the water. Fuller explanation at www.ahoy-boats.info/Safety-Stability.html
@@StephenWalkerAhoy-Boats I have had a few tris, largest is 56 footer with 38 foot beam, leeward always in water, I never flew the main hull.
@@richardjohnholden5104 That's a big'n! Once you fly the main hull you become a monohull, sailing along on the leeward ama. I went to a presentation by a sailor who had sailed around the world in one of the biggest trimarans, if not THE biggest at the time, and he described how the entire crew came up on deck if the main hull came up off the water. It went deadly quiet inside the cabin and they all knew that the next stage would be capsize. Fortunately they did not capsize.
Ummm, it never gets up on the foils
Absolutely. That's part of the design. The leeward ama is always in contact with the water. That's one of the many reasons this boat is so safe, whilst being very fast.
draft?
+Scott Thompson 1.2m or 1.5m. Can't remember.
must be less than 1.2m
If the boat should go to the bottom of a wave and the nominal depth is 1.3m the the rudder will likely hit the bottom.
Didn't see much bang for the buck. Maybe in bigger breeze it might be more impressive.
Yes, that's obvious but I just had to make the recording when I was there. And there just happened to be very little wind. C'est la vie.
It never foiled.
Yes it did but not in this video. There was not enough wind. Check out th-cam.com/video/dVFyXl-GoTQ/w-d-xo.html. But be aware that the design calls for the leeward float to maintain contact with the water at all times. That is one of the many features that makes the Catri design so safe. If you think that for a boat to be foiling it has to be clear of the waves you are mistaken. And boats that foil clear of the waves are only safe until they encounter a wave that it higher than the height at which they are flying. Then they are vulnerable to pitchpole!