CHERUB

Lifting foils with no trim tabs or angle adjustment are asking for trouble if you ask me. OK for going up wind at a steady pace, then you turn around pop the kite the speed doubles giving much more lift you hit a wave and

bang goes your carefuly set angle of attack!

If you had up and down wind settings for the foils it might be enough but auto control is the way forward.

PS no lifting foils when this was taken

Edited by Granite

hey strawberry i did some reading and thinking about foiling and when you put the lifting foils on there is an increase in form and parasitic drag from the foils themselves plus when you put an angle of attack on the foils and use them to generate lift there is some induced drag which depends on the efficieny of the foils and the ammount of lift generated. Which is not good

The gain is because you reduce the displacement of the hull thus reducing the wavemaking drag and potentialy a decrease in form drag as the weted surface area will decrease slightly. All this helps to promote early planing.

When the boat is planing the part of the weight of the hull  will be taken on the lifting foils reducing the effective weight on the hull. The lifting foils use both the upper and lower surfaces rather than just the lower as with a planing hull giving efficiency improvements. Further efficiency improvements come from the higher aspect ratio of the fols compared to a planing hull which is short and fat.

Obviously lifting the hull totaly out of the water would result in lower drag again biut this introduces serious control issues if you are standing on the side dangling from a bit of wire.

thanks im quite proud of that if i do say so my self

thank you

Originally posted by Chris Noble, who refers to one part of someone's anatomy in his signature - no, please, on one else tries to outdo him, Come Fly International Moth Airlines http://www.int-moth.org.uk The Arse!

 Out of curiosity, what's the second link in your sig, Chris? I've tried to view the picture (no comments please....) but it says "Sorry, but you do not have access to this picture."

Is it just a wind-up on your part, trying to see how many gullible girls (and maybe a few blokes too, ) want to check you RS out?

Or is it a comment on one of the photographers who provide regular pictures to fotoboat?? (j/k)