I like the way you capitalized truth. Your statement contradicts my experience so it can not be "The Truth". Which kites have you used to base this statement? Which aeronautical engineering degrees do you hold?
None of the foils I have _actually used_ (see previous my post) would "take the gusts and stay in one place." Any kite can be made to overfly the window if it is gusty enough or if you try hard enough i.e., jumping incorrectly and flying the kite way too far back.
If you overfly the wind window with an open-celled foil it will collapse and fall- there is nothing holding the air in the kite so there is no way around it. The mosquito falls sometimes but usually it recovers without falling. The Flysurfer warrior always just hangs there waiting for you to turn it back. The warrior is the closest I have seen to an "unluffable" foil, but I think that is due to design charateristics in addition to the valved leading edge.
Closed-cell foils simply can't collapse the way an open-celled foil can. On closed-cell foils the valves hold the air inside the kite forcing it into shape. You have to open up velcro or zippers or turn the valves inside out just to get the air out of the kite so you can pack it away.
Open-cell foils collapse instantly when there is no air-pressure on the leading edge holding the kite together. As soon as the airfoil shape is lost the kite falls quickly and it may or may not quickly reinflate and power up in the middle of the window.
I'm not saying that all open-celled foils are junk and not worth using, Quite the opposite, there are many that have very good to exellent performance. The good ones i have tried are much less likely to luff than some of the others and I'm sure the kites you are using are great.
I'm just saying that closed-celled foils have advantages other than easy relaunchability on water.
Have you ever tried to relaunch a 2-line open foil on land? I can do it sometimes but it is not easy without any brake lines to flip the kite over. 2-lined closed-cell foils can be relaunched easily - it is not diffiult to get the kite to flip over onto its trailing edge when the kite holds its shape all the time.
On 2002-10-30 05:42, Anonymous wrote:
no. I'm going to let you know on a little secret. Closed cell foils are two efficient and aerodynamic thus they go further into the wind and collapse. Open cell foils take the gusts and sit in one place.