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Very High AR kite

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kitexpert
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Very High AR kite

Postby kitexpert » Wed Oct 04, 2017 5:41 pm

A screenshot from AR 9 foil kite design. The limits of the Surfplan are reached, because cell count can not be higher than 58 (at least in free version of the program). However cell shape is tolerable even with that number of cells. Also straight line to the wingtips is excessive, because of the limits in bridle design. But doing some unconventional work and then ignoring excessive lines it can be done.

Cascading primary bridles by 3 and 2 makes tertiary level simple, only two lines per side/line row. If it was possible I would have increased cell count to 61, then side by side air intakes in the middle could be avoided. Then cascades would be 3 and 3 and tertiary level still only two lines/side/line row.

Inner structures are quite similar to PL Aero or Ozone R1. However there is only three linerows, like Sonic Race has.

Number of parts is about 800, I haven't counted though 8)

Image

kitexpert
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Re: Very High AR kite

Postby kitexpert » Thu Oct 05, 2017 11:24 am

Have to correct my estimate for number of the parts. I forgot this design has only 3 line rows, so inner parts and bridle is simpler. About 140 parts less than if it had normal A, B, C and Z line rows.

kitexpert
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Re: Very High AR kite

Postby kitexpert » Thu Oct 05, 2017 11:38 am

By doing cascades like this (2 and 3) it is possible to pull wingtip area A slightly to decrease relative pull to B. This high AR means chord is short and very short at the wingtips, so pulling 1:2 B there can be too much.

Image

kitexpert
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Re: Very High AR kite

Postby kitexpert » Sat Oct 14, 2017 1:00 am

A bit more refined design. AR 8 and 49 cells. 49 is one of the good numbers for cell count.

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mgs
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Style: Cruising/Skimboarding/Flat Water/Waves
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Re: Very High AR kite

Postby mgs » Sat Oct 14, 2017 12:57 pm

Are you able to clarify the relationship between Aspect Ratio (AR) and Projected Area (PA) ?
Does PA reduce the higher the AR is for example?

kitexpert
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Re: Very High AR kite

Postby kitexpert » Sat Oct 14, 2017 4:33 pm

mgs wrote: Are you able to clarify the relationship between Aspect Ratio (AR) and Projected Area (PA) ?
Does PA reduce the higher the AR is for example?
PA depends on mostly how much there is canopy curve in kite. Also area distribution between wingtips and central part affects. Wide wingtips result lower PA than thin ones, when there is equal amount of canopy curve.

I don't see it very essential question how AR affects to PA. High AR kite can be very C-shaped and have quite low PA and on the other hand low AR kite can be almost flat and have nearly 100% PA of A.

Red and white kite above has 84% PA, it could be a bit more or even less, preferably more. Kites in Low AR kite thread have PA's 74% to 81%, depending how much cc they have.


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