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T foil rudders on Cherubs?

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JimC View Drop Down
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    Posted: 30 Dec 05 at 10:19am
I'd be suprised if the wider boats didn't benefit from a lifting foil upwind. Fixed foils I'm not quite so sure about. I have a feeling I Luv Wight might have tried one without total success -- too much stuffing of bow into waves IIRC.
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Isis View Drop Down
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Post Options Post Options   Quote Isis Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 05 at 1:42pm
Originally posted by I luv Wight

It seems to help if the crew stays back if the nose dips, instead of running forward up the gunwales, and then flying round the front.


That brightened up my otherwise quite crappy day

Thats for the replies Andy and Andy and Jim, It something id quite like to look at after ive sorted my daggerboard, snout, pole, stump, fittings, rig, trolley and a whole pile of other bits
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m_liddell View Drop Down
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Post Options Post Options   Quote m_liddell Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 05 at 5:42pm

T foils don't seem to be very well understood at this time. At fed week most of the 14's took them off. They are especially difficult to analyse since the rudder blade and the hull all have a large effect on the flow so I guess the only way to find out what is going on is through trial and error.

From the descriptions from cherub sailors, upwind it seems like the boat equivalent of 'riding off the fin' windsurfing.



Edited by m_liddell
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Iain C View Drop Down
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Post Options Post Options   Quote Iain C Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 05 at 11:48am
I've sailed Andy's Aquamarina and it does feel really weird!  When you wind the foil on the nose just makes a beeline for the seabed, but as soon as you move back you really feel the boat start to fly upwind, it just feels really odd being at the back!

I think that a bistro will probably benefit even more so from a T foil than a skinny boat...be really nice to be able to lift as much of that fat hull out of the water as possible.  I'm certainly planning on building one sometime next year.

The one thing I have no idea about is the size of the T foil...there was a huge difference in size between various foils at the Nationals.  What would be cool would be to have the main spar (as in aviation) as a secure part of the rudder and then be able to put interchangeable foils on depending on wind strength!!! 
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Post Options Post Options   Quote Granite Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jan 06 at 6:10pm

the T-foils are definatly interesting, as well as the riding the fin aspect up wind( which is great}, they improve pitch and lateral stability making the boat smoother to sail.

Plus down wind you let them off and they can help to save you from a pitchpole

If you built an articulating blade foil then it would be easy to swap the blades to experiment with sizes, howver I think it would be easier just to build two fixed foil blades.
If it doesn't break it's too heavy; if it does it wasn't built right
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