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hydrofoil vs. aerofoil

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ronnie
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Re: hydrofoil vs. aerofoil

Postby ronnie » Wed Nov 30, 2016 3:31 pm

Johhnn wrote:A long time ago I heard someone talking about some of the promises of composite materials. He suggested that you could make something that, due to the orientation and flexibility of the fibers, would bend in the appropriate way as conditions changed. I'm wondering if it would be possible to have the small flap be thin enough that at high speeds it flexes in such a way that the camber is reduced. With no user input.

One of the first times I flew on a 747, I was seated over a wing. I watched as we went down the runway and slowly the wingtip lifted up. By the time we took off, the wingtip was many feet higher than when the plane was at rest. It was a little unnerving to see all that metal change shape like that and then move in unusual ways during turbulence.

The other thought I had on this stuff is that someone with a 3D printer, CAD software and a water tunnel could turn out many prototypes and test them very rapidly.
Red Bull did that with their front wing in F1 - until it was banned.
See the end of this analysis.
http://www.thisisf1.com/2015/05/31/f1-f ... explained/

Windsurf sails work on the principle that when the mast bends, it allows the sail to twist, reducing the increase in lift when a gust hits.
Some windsurf fins also twist off at the tips when they are loaded up, and swept back wings can be designed to do the same.
There were also windsurf fins that changed their camber in response to the loading - Smartfins.
http://www.windsurfing44.com/forum/view ... ?f=5&t=798

Mossy 757
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Gear: Delta Hydrofoil and board. Cabrinha Velocity 9m, Flysurfer Sonic2 11m, Ozone R1V2 15m
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Re: hydrofoil vs. aerofoil

Postby Mossy 757 » Wed Nov 30, 2016 3:46 pm

ronnie wrote:
Johhnn wrote:A long time ago I heard someone talking about some of the promises of composite materials. He suggested that you could make something that, due to the orientation and flexibility of the fibers, would bend in the appropriate way as conditions changed. I'm wondering if it would be possible to have the small flap be thin enough that at high speeds it flexes in such a way that the camber is reduced. With no user input.

One of the first times I flew on a 747, I was seated over a wing. I watched as we went down the runway and slowly the wingtip lifted up. By the time we took off, the wingtip was many feet higher than when the plane was at rest. It was a little unnerving to see all that metal change shape like that and then move in unusual ways during turbulence.

The other thought I had on this stuff is that someone with a 3D printer, CAD software and a water tunnel could turn out many prototypes and test them very rapidly.
Red Bull did that with their front wing in F1 - until it was banned.
See the end of this analysis.
http://www.thisisf1.com/2015/05/31/f1-f ... explained/

Windsurf sails work on the principle that when the mast bends, it allows the sail to twist, reducing the increase in lift when a gust hits.
Some windsurf fins also twist off at the tips when they are loaded up, and swept back wings can be designed to do the same.
There were also windsurf fins that changed their camber in response to the loading - Smartfins.
http://www.windsurfing44.com/forum/view ... ?f=5&t=798
This is a fun little animation:

https://youtu.be/lFDLZhiCHrI


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