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Home Made Foil Kite

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stefmoris
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Home Made Foil Kite

Postby stefmoris » Sun Aug 09, 2015 8:22 pm

Hello all, just wanted to share the stoke of my winter project with you. I like to make things, and this year I made a kite. :)

Last edited by stefmoris on Sun Aug 09, 2015 8:46 pm, edited 1 time in total.

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Re: Home Made Foil Kite

Postby Denisesewa » Sun Aug 09, 2015 8:42 pm

stefmoris wrote:Hello all, just wanted to share the stoke of my winter project with you. I like to make things, and this year I made a kite. :)

[vimeo]http://vimeo.com/135665987[/vimeo]
Thats very cool, having built a small open cell I know the work and dedication involved.
Awesome !!! :thumb:

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FLandOBX
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Re: Home Made Foil Kite

Postby FLandOBX » Sun Aug 09, 2015 8:54 pm

Very cool, Stef. I am totally impressed. Must feel awesome when you ride that kite!! :thumb:

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Re: Home Made Foil Kite

Postby darippah » Mon Aug 10, 2015 12:53 am

Amazing work. Very impressive

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Re: Home Made Foil Kite

Postby Tfcm » Mon Aug 10, 2015 2:06 am

Some serious skill and dedication.. Awesome work

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Re: Home Made Foil Kite

Postby kitexpert » Mon Aug 10, 2015 9:30 pm

Well done.

I have too used MH91 profile, my question is: how did you modified it? I can see your kite is not stable (required quite a lot tuning). I know too well those high-AR kite problems :evil: ...

Fortunately foilkites have a bridle you can adjust and get over some unstability problems. It's however too bad when you have to increase AoA to get stability, it decreases high-end and makes kite slower.

So how much camber, in what % is the thickest point and what is a profile depth? Did you morph profile parameters in different part of a wing?

And is there d-ribs? And how is the primary bridle, is it on every second or every third profile? And the speedsystem, 1:2:4 a la FS Speed, I presume?

I think your kite is one of the most remarkable diy-kites I have seen. It's big, it has meny cells, it must be powerful and it works. Congrats!

stefmoris
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Re: Home Made Foil Kite

Postby stefmoris » Tue Aug 11, 2015 7:56 am

Thanks everyone for the wonderful comments :)

Kitexpert: This was my first foil kite ever. Having never tried a flysurfer, chrono... Etc. I was kind of shooting in the dark in some ways. Though I did design and build a ram air parachute almost 20 years ago so I'm familiar with the design and construction process.

I modified the MH91 by thinning it (non proportionally) to account for material billow and that was just freehand, no science. I also added more reflex, again freehand because I was worried about having too much bar pressure. That was a mistake, it is way too light in the bar! Not enough pressure.

There is no cross bracing so lines attach every second cell.

Mixer system is standard as you say.

I adjusted the bridle by adding negative camber (shortening b and c) not by adding angle of attack, though on my next kite I will move the tow point back a bit. I haven't measured the final amount yet relative to my original CAD spec yet so not sure, but a lot!

-stef

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Re: Home Made Foil Kite

Postby Bletti » Thu Aug 13, 2015 7:18 am

Nice job with the video editing too!

d21d3q
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Re: Home Made Foil Kite

Postby d21d3q » Sun Aug 23, 2015 11:42 am

which CAD are you using for design?

stefmoris
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Re: Home Made Foil Kite

Postby stefmoris » Sun Aug 23, 2015 9:43 pm

I used the sheet metal tools in Solidworks then added billow manually.
FXLR5 for analyzing the profiles (just for stagnation point and 0 lift AOA)
Lightwave for visual candy and such -stef


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