Location: brighton Hull design - CAD drawings Hi, I have a hull design that needs some advice, it's a Cat with a Hydrofoil to be made in GRP from a mold. Location: Maryland Catamarans and trimarans have been built (Westamaran, Fjellstrand, etc) that operate as fully foil supported high speed vessels, with varying degrees of success.
Location: Australia If the intention is to have it entirely foil-supported at speed, what control will there be over trim ?
Originally Posted by BMcF Catamarans and trimarans have been built (Westamaran, Fjellstrand, etc) that operate as fully foil supported high speed vessels, with varying degrees of success. Originally Posted by Mr Efficiency If the intention is to have it entirely foil-supported at speed, what control will there be over trim ? Originally Posted by congellous Wing tip flippers and a mid propellor but this is very much a draft proposal I'm looking for general advice on the shape and feasibility, cheers Umm - have you done any measurements, displacement, weights etc at all ? There is no point discussing feasibility and shape unless you have a bit more than pictures. Originally Posted by rwatson Umm - have you done any measurements, displacement, weights etc at all ? Originally Posted by congellous I wondered wether it could be used as a hydrofoil at slow pace just to save drag as it's an uneconomical shape ?
We built and tested a trimaran that was assisted by fully submerged foils such as you showed on your sketch.
But we've also been involved in foil-assisted projects where the vessel never made it past the drag hump and foils were only a source of excessive drag.
Originally Posted by congellous It's not going to be used on the seas, however, it may be transited like a barge and maybe moved around in coastal waters.
At lower taxi'ing speeds it doesn't matter that much about the drag and it would provide a stabilising effect I assume.
Take off as low speed as possible, I have read a few threads and know that there are issue's. It's 10'6 beam and 41'4 length, enough speed to get it onto the foil is all that is needed and otherwise just walking pace. Originally Posted by congellous Hi, I have a hull design that needs some advice, it's a Cat with a Hydrofoil to be made in GRP from a mold.
I'm open to suggestions on the props and yes some tried and tested foil design, nothing fancy needed, it's not a performance boat, timid little cruiser. Originally Posted by BMcF Given the hull shape and intended use, perhaps you should look at adding skirts fore and aft and pressurizing the cavity between the hulls with a small centrifugal blower.
Originally Posted by congellous I might even drop the hydrofoil idea, however, I was wondering wether the channel between the hulls could be shaped to entrain the water to a central propellor ?


Location: Australia Channelling the water, which will be aerated, into your propellor I would doubt would be prospective.
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By clicking 1 Click Bid, you are agreeing to buy this item from the seller if you're the winning bidder. The idea is it floats pretty much on the waterline but has the stability of the two submerged hulls and then at lowish speed starts to lift out onto the foils.
Only once you've lifted the hull nearly clear of the water is the resistance potentially decreased relative to the bare hull.
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Contact the seller- opens in a new window or tab and request a postage method to your location. Delivery times may vary, especially during peak periods and will depend on when your payment clears - opens in a new window or tab. You've read and agree to the Global Shipping Programme terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase your maximum bid amount. By clicking Confirm bid you commit to buy this item from the seller if you are the winning bidder. Import charges previously quoted are subject to change if you increase you maximum bid amount. If you design the tunnel correctly, it will actually get some uplift from the air compressed into the tunnel at speed. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. It's a river boat hull so the proportional shape is fixed, following reading on here I thought I'd make it a Cat and then wondered if it could even be a hydrofoil from the video's and design data. Once the vessel exceeded 14 knots, the speed would then quickly come on as the drag reduction benefits of being on foils became apparent.



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