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small front wing

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DAnderson
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Posts: 93
Joined: Thu Aug 25, 2016 2:17 pm
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Re: small front wing

Postby DAnderson » Wed Feb 26, 2020 1:42 am

I find the drag a typical surf foil creates usually causes it to become overpowered more quickly than a smaller/faster wing; the opposite of the op observation. I swapped to the 633 for it's ability to overcome this a while back.
Perhaps your just not comfortable w/ the speed yet?

Slower surf foils are great fun, usually barely powered in waves & whatnot; while smaller/faster wings seem to have a desire to go fast/boost, requiring significantly more kite power ~double.
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dkazhdan (Wed Feb 26, 2020 2:13 am) • grigorib (Wed Feb 26, 2020 7:56 pm)
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dkazhdan
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Re: small front wing

Postby dkazhdan » Wed Feb 26, 2020 2:11 am

DAnderson wrote:
Wed Feb 26, 2020 1:42 am
I find the drag a typical surf foil creates usually causes it to become overpowered more quickly than a smaller/faster wing; the opposite of the op observation. I swapped to the 633 for it's ability to overcome this a while back.
Perhaps your just not comfortable w/ the speed yet?

Slower surf foils are great fun, usually barely powered in waves & whatnot; while smaller/faster wings seem to have a desire to go fast/boost, requiring significantly more kite power ~double.
Very true, except that with surf wings you get overpowered because of true wind as opposed to apparent wind while riding small wings? Wondering if this can be the case?

i don't quite understand the physics of it, could there be some kind of a critical speed value after which the apparent wind kicks in so much that it causes the foil to accelerate beyond one's control? Since the wing has no drag?

airsail
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Re: small front wing

Postby airsail » Wed Feb 26, 2020 1:40 pm

As an experiment I built two wings, same plan shape (low profile) and size, around 1100 sqcm. One is 30 mm thick, one 16 mm thick. Both have similar low stall speed, but the upper end of the thick wing is about 16 knots where the thin wing is 20 knots.
Roll tacks and 360’s are more difficult on the thick wing, less glide makes it harder to get through the turn.
The thin large wing is the preferred option
These users thanked the author airsail for the post (total 3):
Oldman (Wed Feb 26, 2020 4:10 pm) • grigorib (Wed Feb 26, 2020 7:50 pm) • Kamikuza (Wed Feb 26, 2020 10:35 pm)
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