knuthansen wrote:Just reading some stuff on http://kitesurfingschool.org/kite.htm to get a clue about some kite design principles.. nevertheless, I got some questions for ya:
- What determines light wind performance? Apparently, high aspect kites have a higher Lift/Drag ratio and fly faster, thus generating more dynamic power. Sacrifice is less projected area. So is a flatter shape/higher projected area generally better for light wind, or is there an optimum value somewhere?
-Comparing a c-kite and a bridled, flatter kite with no pulleys, is the latter gonna have more depower (with less bar throw)? (depower=more change in angle of attack) If so, why?
-How do todays c-kites achieve more depower than the ones in the ol' days?
-Are low aspect kites better upwind? (Leaving angle of attack, leading edge diameter etc. constant)
-How does the size of the wingtips affect stability and turning speed?
- Does anyone have that document about LEI sphere theory, as mentioned here: http://kitesurfingschool.org/kite.htm#LEI Spherical Theory ? Links are broken, unfortunately.
That's all I can think of for now!
knuthansen wrote:I knew I can count on ya Peter
Lightwind performance: My first kite was a super flat bow which was pulling like a truck at the side of the wind window. However it did not have any grunt and I always struggled to get through the lulls.
My current SLE is more grunty and turns faster, a bit higher aspect, but with light bar pressure and very little pull at 12. Definitely better low end!
That's why I thought there might be an optimum value somewhere..
Upwind: Somehow I thought c-kites are less good upwind, but I reckon that's more when using the wakestyle setting with a higher angle of attack, which reduces the size of the wind window. On the other hand, why are race kites fairly flat? I thought in course races upwind capability is crucial.
Depower: Kinda hard to imagine, I will try to draw it. Another thing I was wondering about: When choosing the more forward frontline setting, manufacturers usually say that gives more depower. What happens is that the kites sits deeper in the window. However the angle of attack with the highest lift is between 15-20 degrees, so if I pull in some depower in that setting, would I get even more lift?
Another thing that was not mentioned in the document I mentioned: How affect different trailing edge shapes the flying characteristics?
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