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DIY onestrut kite

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downunder
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Re: DIY onestrut kite

Postby downunder » Tue Oct 31, 2017 3:31 pm

I'm confused with this 3D stuff you guys talking about. Down to Earth please:

- the 3D model is printed out as a flat projection. The accuracy comes from 'flattening' the curve by the software. Better sw, better approximation. Correct? Or am I writing shyte...:)

This is irrelevant, we are talking 'one off' knock off, not a massive production. No need to develop further anything if it suits your riding style 100%.

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Re: DIY onestrut kite

Postby kitexpert » Tue Oct 31, 2017 4:53 pm

Parts are of course flat. But when you sew them together they form a 3D shape. Then it is very difficult try to lay it down flat for measuring/copying like you suggested.

I don't think software quality is very critical, it is just calculation to convert 3D model to 2D patterns. Before computers similar work was done manually by drawing projections etc, it was an art of its own.

If you want to make as smooth as possible kite you do it by increasing panels and segments and/or using constant curve LE. More sophisticated programs have options for adjusting skin tension/ballooning etc., but to control these parameters needs practical experience.

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Re: DIY onestrut kite

Postby downunder » Wed Nov 01, 2017 2:40 am

That is why I'm asking if anyone attempted this.

It shouldn't be that difficult with a vac table. The panels are not that big.

But one thing is interesting, if the sw is not that critical, if the tolerances are not either, than the "only" critical component is sewing:)

D.

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Re: DIY onestrut kite

Postby PanTau » Wed Nov 01, 2017 11:06 pm

To copy the sail is very easy. You may get some wrinkles but the kite will fly.
To copy the LE is (almost) impossible. Tolerances are less than ~0.5mm otherwise you get a twisted tube. And you have to unpick the seams of a new kite.

Easiest way to copy a kite would be to use the same software as the manufacturer. Inflate a new kite, take measurements, print the panels, compare them with the kite, adjust 3D model, print panels...
Not much fun at all but it will work and for sure done from time to time...

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Re: DIY onestrut kite

Postby downunder » Thu Nov 02, 2017 3:22 am

Yep,

I thought so. There is a catch tho, is the sw printing the markers on LE? I can't imagine how would one assemble it with no markers...

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Re: DIY onestrut kite

Postby kjorn » Sat Nov 04, 2017 2:00 am

downunder wrote:
Thu Nov 02, 2017 3:22 am
Yep,

I thought so. There is a catch tho, is the sw printing the markers on LE? I can't imagine how would one assemble it with no markers...
A seamstress making a gentleman's suit would use chalk. One assumes they do something similar on kites.

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Re: DIY onestrut kite

Postby BWD » Sat Nov 04, 2017 2:06 am

If you look very closely at kites you can often see marks by the seams, pen I guess, or pencil.
If you set software to make a certain type of seam, you know you need to mark for example 5mm in from each edge, etc. How do they do it? Machine, straight edge, laser, that's up to each factory --or each sewer. Practice plays a role I'm sure.

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Re: DIY onestrut kite

Postby PanTau » Sun Nov 05, 2017 11:16 pm

Updated my onestrut kite Ventus 8 on Github. Including spec, DXF and 3D files.

Image

Image

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Re: DIY onestrut kite

Postby marlboroughman » Wed Nov 08, 2017 3:42 pm

Hansen Design wrote:
Mon Oct 30, 2017 4:39 pm
While conceptually possible, picking apart a kite and duplicating the components is practically impossible, especially the canopy which is to some extent elastic.
LE - No problem
Struts - I can actually make better struts than Switch
Canopy - More difficult but it can be done. The key is to get the original RipStop and use the grid pattern to get back to original. So follow the grid, leave the old piece baggy, take the outside curves and voila back to original.

In general don't pick apart the stitching but cut sections and add for stitching, the original amount, or how much you want for your particular machine, foot size or seam type.

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Re: DIY onestrut kite

Postby PanTau » Thu Nov 09, 2017 12:18 am



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