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. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. International Shipping - items may be subject to customs processing depending on the item's declared value. Your country's customs office can offer more details, or visit eBay's page on international trade. Estimated delivery dates - opens in a new window or tab include seller's handling time, origin ZIP Code, destination ZIP Code and time of acceptance and will depend on shipping service selected and receipt of cleared payment - opens in a new window or tab. Brand New: An item that has never been opened or removed from the manufacturera€™s sealing (if applicable).
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We offer full customer support with all of our products so please contact our friendly team if you have any questions, need any help or have any technical issues. Location: Vermont Square-back Canoe Plans I am looking for plans to build a small square-back canoe.


Location: Lakeland Fl USA You have a set of wants and circumstances unique to your own situation. Location: La Florida In the early 1970's I built a small 2 hull boat which I used to tie onto the roof of my car.
But widen the square-sterned canoe until it's the width of a dinghy and it's closer to a dinghy than a canoe. Okay, you could keep it narrow, say 28", and limit the occupancy to one (maybe a small dog too), and cut 2 ft of the stern of a ten footer and yes, you have a very small square-sterned canoe.
Location: La Florida pistnbroke-You reminded me of what my friend did back in 1971. Hull Designer is a simple, interactive, visual 3-d hull design Windows program for modeling and developing panels for hard chine construction.
This tutorial is very usefull for designing your own boat and even for redesigning other boats according to their boat plans which you can find in the DIY Boat Plans for Boat Building guide. Be careful not to open the Hulls generated .dxf file – if you do that you’ll get a 2d line drawing, not the 3d segments. Thanks to Rick Malagodi for providing this great tutorial and a wonderful boating page you can see here. Originally Posted by Mr Efficiency Channelling the water, which will be aerated, into your propellor I would doubt would be prospective. Location: Juneau, Alaska The forward foil would likely introduce a wake of turbulence which would render the aft foil ineffective.
Originally Posted by Deering The forward foil would likely introduce a wake of turbulence which would render the aft foil ineffective. Location: Rockport, Maine & Rochester Hills, Michigan How will the height and attitude of the boat be controlled when foil-borne? Originally Posted by DCockey How will the height and attitude of the boat be controlled when foil-borne?
Location: brighton I was hoping it would sort of plane on the base of the cat hulls not really out of the water ? The ones designed, in general, by the South Africans, such as Prof Hoppe, Teknicraft et al.
Originally Posted by Ad Hoc The ones designed, in general, by the South Africans, such as Prof Hoppe, Teknicraft et al. I've thought that trimable outboards might accomplish the same effect on a small boat, but could be adjusted dynamically.
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By clicking Confirm bid, you are committing to buy this item from the seller if you are the winning bidder and have read and agree to the Global Shipping Programme terms and conditions - opens in a new window or tab. 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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We offer full customer support with our products so please contact us if you need any help before leaving feedback, star ratings or using Resolve a Problem option. Later, someone built one almost identical in dimensions which they submitted to popular mechanics magazine and received a golden hammer award. By using it you are able to find Center of Boyancy, Center of Lateral Area, Length Waterline, and righting moment (pitched or heeled) among other calculations. The idea, however, is to cruise at minimum speed to be on the foil, with this in mind and the distance between them is there any other configuration - 4 struts ?
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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. Please do not select Resolve a Problem or Return Item as this will setup a case in the Resolution Centre on eBay. There is a free shipping option for UK buyers and we do have a download service if you need your item quickly. He took 2 pieces of corrugated metal roofing, doubled them over and screwed a short piece of 2x4 into each end. You can also create patterns for stem, stern, bulkheads, up to 10 chines, and up to 8 frames for construction. Open the Crossroads generated .dxf file into your AutoCad and there you have the 3d version of your Hulls design. 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. This will affect our ratings and make it more difficult to resolve any issues that can easily be fixed with a simple message to us instead. UK Next Day delivery should arrive the next working day but can take up to a maximum of 2 working days. The HYSWAS (MAPC's) and Navatech's HYSWAC were both entirely dependent on the active control of foil lift to acheive and maintain stable flight. It fell apart when our friend stepped on the cross beam, breaking it which caused the boat to fold upon itself like an open faced sandwich.
He had a good time upon the river after he corrected that design flaw and I built mine the following weekend.



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