Contact   Imprint   Advertising   Guidelines

DIY Foil Kites

For all foil kite riders
Rein de Vries
Rare Poster
Posts: 46
Joined: Tue Apr 30, 2019 2:42 pm
Local Beach: Rockanje - The Netherlands
Favorite Beaches: Brouwersdam - The Netherlands
Style: Free ride
Gear: Flysurfer Sonic, Ozone R1, Ocean Rodeo, F-one hydrofoil
Brand Affiliation: None
Has thanked: 7 times
Been thanked: 8 times

Re: DIY Foil Kites

Postby Rein de Vries » Sat May 22, 2021 7:42 pm

Flying my 5m2 diy kite and talking to Niklas we both see that our kites (same profile) tend to be rather fast with a high power spike as compared to commercial high AR foil kites. The latter fly more slowly and retain pull all through the window. It puzzles me a bit why this is. We obviously need that on the water and towards my new project I consider a more cambered profile as a mixer setting with shorter Z and longer B and C are found to give the diy the desired continuous power in the window. It is like a bridle induced increase in camber. I like to aim for a diy kite that has this property by design and wonder whether this would resolve it. I obviously loose a little stability by trying and wonder whether this camber is the reason that the commercial kites fly little different or that it is just a bridling difference from starters we are looking at. For comparison; our diy projects have little above 1% camber whereas the commercial kites have up to 3% or so. Profile thickness and AR are pretty much comparable in this sense. Curious to hear your thoughts!

User avatar
Schietwedder
Medium Poster
Posts: 88
Joined: Sun Dec 09, 2018 1:35 pm
Local Beach: Surendorf, Kiel, Germany
Gear: Diy Gear
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 33 times

Re: DIY Foil Kites

Postby Schietwedder » Mon May 31, 2021 12:49 pm

I would say yes, to a point.

First of all there´s two effective measures:

1. increasing the area between the camber line and chord line but staying at the same max. camber.
That is what you do with the bridle effectively just built in the profile.
So the disatvantage, it has a far bigger impact on lessening the stability for a given lift, but you also can pull it out better with your bridle if it´s too much.

2. Increasing the camber by percentage and doing so in the very front (between A and B) of the profile to minimize impact on stability.
It´s the cleaner method with regards on stability but i am not so sure how much you can pull out again if the kite overflies too much, cant be depowered so much or you want to have a bigger windrange.

That´s why I´m still struggling with myself back and forth also on doing the same as you increasing camber.
It´s not such big of an issue for the usability of my kites just shortening z a little and I have heaps of grunt.

Once learning how to foil I might wan´t to get rid of that grunt again slightly.
I will wait until my 9m is done and if it goes in the same direction as how my 6m is flying I won´t change much, maybe a little more grunty profile. But I will first increase profile thickness before touching on camber I guess. We have a lot of lee rotor because of a military pier and some high coastlines in windward, so stability is really important especially when its light winds or the breeze turning slight offshore in the evenings after work when doing the last laps.

Also fabrication improves a lot with every kite in the beginning, so most issues disapear without much change in design once having a good basis I figured out.

User avatar
Schietwedder
Medium Poster
Posts: 88
Joined: Sun Dec 09, 2018 1:35 pm
Local Beach: Surendorf, Kiel, Germany
Gear: Diy Gear
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 33 times

Re: DIY Foil Kites

Postby Schietwedder » Sun Jul 18, 2021 1:20 pm

Some more impressions of the 6m in steady 18-20 knots.
Turning and reacting quite nicely, think the z-straps make a difference. If brake line doesn´t enter at 90° the steering line input does not pull out the billow first but directly the load goes into the strap.
The Z line is now shortened 3cm for Twintip. On the buggy or foil I have the Z lines 3cm more loose letting fly it a bit more forward.
Drifting also quite well on the surfboard with the light weight (not on video)


Rein de Vries
Rare Poster
Posts: 46
Joined: Tue Apr 30, 2019 2:42 pm
Local Beach: Rockanje - The Netherlands
Favorite Beaches: Brouwersdam - The Netherlands
Style: Free ride
Gear: Flysurfer Sonic, Ozone R1, Ocean Rodeo, F-one hydrofoil
Brand Affiliation: None
Has thanked: 7 times
Been thanked: 8 times

Re: DIY Foil Kites

Postby Rein de Vries » Mon Jul 26, 2021 8:48 pm

Very much impressed! Great work :thumb:

What can you say about the difference you feel between flying commercial kites and your DIY's. Are you close :?:

User avatar
Schietwedder
Medium Poster
Posts: 88
Joined: Sun Dec 09, 2018 1:35 pm
Local Beach: Surendorf, Kiel, Germany
Gear: Diy Gear
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 33 times

Re: DIY Foil Kites

Postby Schietwedder » Mon Jul 26, 2021 9:47 pm

Thanks Rein!

I must say I can't say much about how commercial kites compare as I use only my own at least in 6m size or close I don't have any comparison.
Would be interesting to fly a Kauper Falcon, a Hyperlink, Soul, Nova or similar to find out.
Not much foil kites up here in my local spot, only a 12m Soul I flew I can compare to my 11m.
A few weeks ago I kited together with a guy with a Kauper Falcon 13m and a door as I flew my 11m and normal Twintip. He had some more powerful turns and better low end in lulls of course but was very impressed when he asked what size it was and didn't expect to be an 11.
Would have loved to swap kites but stayed too long outside then he was gone already.

What I love about the 6m is that it loops forever, it fly's still flies when everything falls out of the sky with 1100g and drifts very easy when riding a wave or turning downwind with full speed in the buggy. That is mostly due the light weight and not any fancy design or engineering I think. I was amazed though how light weight you could achieve with very little effort. Just a few less cells that billow still looks fine and d ribs only where the bridle needs some, no fancy cutouts just the round standard holes from SP and only here and there a bit of seamtape to align things at the alignment points.

Has it's downsides also with 27g upper and lower skin cloth. Accidentally looped it with ground impact in the buggy in high speed and the cloth shaved through behind the LE battens at two cells in the buggy last weekend, but was a quick fix luckily.
Don't know though if 33g would make such a big difference though in that circumstance. Only bullet proof 40g+ at the LE and battens not all the way to the front would have like on SOUL probably.
Better fly careful is the easiest fix probably.


Return to “Foil Kites”

Who is online

Users browsing this forum: No registered users and 9 guests