Roll Control using foils

[Wingz]

Originally Posted by Doug Lord

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Don't you think that underestimates the situation a whole lot?
Foils are used on cruise ships, freighters and yachts ect for roll control and have been for years .Hydrofoil ferries are common place in some areas of the world.
Large trimarans use foils for lift and are going faster than ever because of it. Foils are being applied across a wide range of keelboats to lift, reduce wetted surface and add RM. The fastest sailboat in the world is a ballasted hydrofoil....
The Moth monofoiler is the fast small sailboat-mono or multi-under 20'. The R Class is is the first two person monofoiler to begin to convert to full flying hydrofoils. The I-14 and National 12 classes ,among others, have adopted rudder t-foils for vertical lift and added pitch control.
Mirabaud ,the largest monofoiler currently afloat, just beat the Moth at Weymouth Speed Week. In France, at the "Trophee St. Clair" hydrofoil equipped kite boards just showed that they are capable of beating "normal" kiteboards. Bradfield is about to start testing his 18' carbon "Osprey" and Ketterman is developing a new foiler as well. Lots of development all over the place.
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There are sources of information that can help you learn not the least of which is www.foils.org THE organization for those interested in foils.
Study, experiment with models and full size-foils at model size can teach you a lot and the information is almost directly transferable-according to Dr. Sam Bradfield-one of USA's foiling pioneers. The best book on the subject of small experimental hydrofoils is Ray Velinga's "Hydrofoils Design Build Fly" ISBN #9780982236116, published in 2009 by Peacock Hill Publishing ,Gig Harbor, Washington. This IS the bible for anyone interested in hydrofoil experimentation!

When I can go to my local marina and rent a 30 foot day sailor with foils, and on a breezy day wow my girlfriend with a 40 knot ride, then I will change that statement. In the mean time, thanks for the info, I am sure there are a number of people out there that have not heard yet and can use it.

Perhaps with your vast knowledge on the subject, you can post just a few of the boats you have built yourself and the experiments you have done for us, and some of your original ideas on the matter so that we can all understand where you are coming from. Videos of your speed trials would be beneficial. It would be interesting to hear about your work on projects like Maquaire Innovation or SailRocket and particularly about your experiences on Hydroptère. Have you ever gone sailboarding?

[Wingz]

Originally Posted by CutOnce

Just have to point out that viewing patents gives you lots of OLD ideas - the new ones aren't there yet. Much of what is patented won't stand up to serious evaluation - in many cases there is established prior art that was never found by the patent agent verifying the claim.

The next thing to point out about patents is that they in no way establish the practicality, usefulness or value of the "idea" in question - many patents are on useless, impractical and valueless concepts.

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CutOnce

That is what I meant by 'entertainment'.

It is like the guy who built a light airplane and mounted a sail on top. I don't think he ever got it to fly, but with the wingsail tech of today where land sailors are doing 126 mph, maybe, just maybe he wasn't so foolish after all.

[Cheesy]

Originally Posted by Wingz

When I can go to my local marina and rent a 30 foot day sailor with foils, and on a breezy day wow my girlfriend with a 40 knot ride, then I will change that statement. In the mean time, thanks for the info, I am sure there are a number of people out there that have not heard yet and can use it.

Perhaps with your vast knowledge on the subject, you can post just a few of the boats you have built yourself and the experiments you have done for us, and some of your original ideas on the matter so that we can all understand where you are coming from. Videos of your speed trials would be beneficial. It would be interesting to hear about your work on projects like Maquaire Innovation or SailRocket and particularly about your experiences on Hydroptère. Have you ever gone sailboarding?

Wingz, you really need to do a bit more research on how a boat actually sails, you mention that foils are not utilised below the water in boats, this is fundamentally wrong, the keel/centreboard and rudder are foils and do generate lift in exactly the same way as a sail - high velocity low pressure fluid flow... the way you have configured your idea it can not work