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Trapped air in double skin foils?

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Re: Trapped air in double skin foils?

Postby Adventure Logs » Sun Jan 03, 2021 1:32 am

Peter_Frank wrote:
Sat Jan 02, 2021 11:14 pm
but some would claim it being drag when not closed cells.

8) Peter
It’s not a claim it’s a fact. Turbulent air is drag. It’s called aerodynamics.

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Re: Trapped air in double skin foils?

Postby 14ToeSide » Sun Jan 03, 2021 5:29 am

14 STRONGLY AGREES!💨💨💨💨💨💨

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Re: Trapped air in double skin foils?

Postby PugetSoundKiter » Sun Jan 03, 2021 7:53 am

Peter_Frank wrote:
Sat Jan 02, 2021 8:44 pm
Trapped air in double skin foils? Some argue it is an advantage, others dont...
I'd argue it's an advantage. Take any of your double skin foil kites out and try to fly them uninflated with the intakes taped closed :roll:

:lol:

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Re: Trapped air in double skin foils?

Postby tomtom » Sun Jan 03, 2021 10:15 am

To answer original question. Any added mass is bad overal. It can be advantage on very special one stroke events. Like jumps or straight to foil powerstroke. Here you can utilize energy stored in momentum. Only on reasonable longer lines though.

I much prefer inertia less kites. Having all type of kites double skin foil kites have most inertia from all kite types.

I

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Re: Trapped air in double skin foils?

Postby Herman » Sun Jan 03, 2021 10:58 am

Acceleration due to gravity is same for heavy or light objects. The only way the motion is influenced on the down stroke is the fluid dynamics, is it not. More kinetic and potential energy is in the heavy object, but if you extract it you will require more energy to make it fly on the upstroke via a system that is bound to be less than 100% efficient. Guessing extra weight is bad.........but doing the maths will give me a headache plus it is early in the morning and these thoughts could be garbage!!!!!!

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Re: Trapped air in double skin foils?

Postby Kamikuza » Sun Jan 03, 2021 11:32 am

PMU hacked your account, Peter?

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Re: Trapped air in double skin foils?

Postby PullStrings » Sun Jan 03, 2021 1:06 pm

14ToeSide wrote:
Sun Jan 03, 2021 5:29 am
14 STRONGLY AGREES!💨💨💨💨💨💨
To let out the trapped air bring back the long zipper

:whisper:

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Re: Trapped air in double skin foils?

Postby lederhosen » Sun Jan 03, 2021 2:13 pm

Peaks probably loose more energy through waterdroplets too, especially when they fly up. The ultralight fabric has an uneven surface with a bend at the trailing endge and each droplet that sprays off probably makes the fabric jitter because there is no supporting force from pressure like on a double skin.

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Re: Trapped air in double skin foils?

Postby 14ToeSide » Sun Jan 03, 2021 4:00 pm

U can tell there are a lot of places where there is NO WIND🤣🤣🤣🤣🤣🤣. Lots of BOREDOM

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Re: Trapped air in double skin foils?

Postby PullStrings » Sun Jan 03, 2021 4:13 pm

14ToeSide wrote:
Sun Jan 03, 2021 4:00 pm
U can tell there are a lot of places where there is NO WIND🤣🤣🤣🤣🤣🤣. Lots of BOREDOM
What do you call a circumsized double skin foil ?

A Peak 4

:whistler:


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