Herman wrote: ↑Sun Jan 03, 2021 10:58 amAcceleration due to gravity is same for heavy or light objects. The only way the motion is influenced on the down stroke is the fluid dynamics, is it not. More kinetic and potential energy is in the heavy object, but if you extract it you will require more energy to make it fly on the upstroke via a system that is bound to be less than 100% efficient. Guessing extra weight is bad.........but doing the maths will give me a headache plus it is early in the morning and these thoughts could be garbage!!!!!!
I don't think the stiffness is the main reason for better performance. I am also paragliding and fly single skin paragliders. However, unlike the kite market there are high AR single skin paragliders (AR of 6), I don't know of any high AR single skin kites (not counting LEI, which in fact are also single skins). The main obstacle is the increased drag due to the fact that there is no skin on the bottom for better aerodynamics. Hence single skins just do not fly fast, otherwise they have quite good performance, in some respect even better performances and even better stability than double skins even though they are not at all stiff. TomRegis-de-giens wrote: ↑Tue Jan 05, 2021 12:03 amThere is however one big advantage of entraped air : the internal pressure provide an additional stiffness that allows more efficient foil profile, like less "twisting" of wingsfor exemple. On the contrary on a SS (so, without internal pressure ) you need to impose more Angle of Attack on wings (to avoid their collapse), and you loose some efficiency (drag) and thus less speed and pull during the travel of the kite, very useful in lightwind.
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