Interesting you have mentioned this and I think it is instructive.
It seems 'jellyfish,' which originally meant constant (and irritating) oscillation under load (typical of some early 4-line C kites) has evolved today into describing wiggling and flexing for bridled kites when de-powered. To me, this is an unfair way to judge a bridled kite because when de-powered it is basically outside of it's intended flight range. The Nitro is a high-aspect SLE C-kite with a very long LE tube which is 135mm ( 5.3") in diameter in the center and 98mm (3.85") at the 3rd strut (where the wingtip starts.) By any measure, this is small in comparison to many other kites of similar size with the reason being improved speed and efficiency - particularly power-building turns and upwind angle. We have done substantial testing on the Nitros with an aggressive 110kg (240 lbs) heavyweight in Hawaii for a full year in many wind conditions. Pic attached. A portion of that testing included underinflated bridle 'tweaking' to check for kinking or folding under high loads. But, when a bridled kite is de-powered or underpowered, the bridle tensions are reduced and the kite becomes relatively more free to flex depending on it's level of structure. If a kite does not flex with an unloaded bridle, it likely has an overly large leading edge with increased weight and drag. In the end, the Nitro LE tube is finely tuned with a bit of flexibility for smoother input response and pushes the limits in diameter to produce a high level of performance in terms of power and upwind VMG.
Cheers!
C Johnson wrote:I've flown a lot of kites behind that point including foils, SLE's and C kites. bottom line is most of them jellyfish behind there. the only ones that I haven't really seen do this are kites that have big fat leading edges or 5th lines, even then they still do a little bit. I was talking to pearse a bit more today about it and it could have been that he had the kite underinflated too since it was a day where the temperature dropped significantly during the time we had been out riding.