edt wrote: ↑Thu Nov 24, 2022 5:13 pm
it's 2 or 3 pounds a kg or two effectively pinching the wingtips inwards. Go set your kite on it's edge like you are going to launch it and then place a small sandbag on the tip. It will deform.
When kite is on the ground having no bridle support it is completely different situation to when it is flying and bridle is loaded. So your speculation of deforming is very suspicious. And if there was small deformation it is very questionable if it could have any effect on how kite flies. Kites are not that small objects, few cm's here or there on its shape doesn't mean anything.
You can tweak canopy curve and curve location settings of kite endlessly. And like always, some properties of kite get better and some worse for different values (shapes).
edt wrote: ↑Thu Nov 24, 2022 5:13 pm
So it's not the amount that matters so much as exactly where the extra pressure is creating by moving the V to a high Y. The place the pressure is deforms the kite quite a bit in some models (others it doesn't deform it as much).
First we should remember there isn't any high Y bars available. All have low V's but some have few meters extension from bar to front line split. All LEI kites have short wing span and small tow point separation, so flying line angles differ only few degrees between low V and "high" Y. LEI kites have also some structural stiffness and quite a lot canopy curvature which make these issues even less significant. Extreme example is C-kite which has "natural" flying shape, having no bridle at all.
(Actually it is possible to make soft C-shaped kite without any rigidity or support on LE, so called sled kite)
I've flied 14m LEI kite with a 12m line set. Then front line split is much closer to kite than in any "high" Y bar. Certainly kite flies differently than with 24m lines but having very short lines is much bigger factor than high Y "compression".
edt wrote: ↑Thu Nov 24, 2022 5:13 pm
while other kites were designed with the high Y in mind and won't fly properly without that extra pinching on the tips.
If you go for extremely high Y it starts to matter for bridle design and canopy curve. However there isn't any reason to do that and it makes design of safety more difficult and clumsy. Also line sets become nonstandard and kiter loses certain practical advantages of having low V with equal line lengths.
I guess main reason for "high Y" bars is some manufacturers want to sell their own bars to customers, or try to prevent them using standard low V bars. Certainly there isn't any principal advantage to have front line split few meters from the bar.
If you think some kite manufacturers have studied and tested all different Y split point heights and found some optimal height I can assure that is not the case. The whole idea of that is rather silly for anyone who knows something about the kite design.