Regis-de-giens wrote:Hi all,
Hydrofoiling low end limits are so low that the stability of the kite at the zenith can become a showstopper , for example when you need to swim out from shore before launching the waterstart. Hence my 2 questions :
- what is the root cause of the backstall of the kite (not so obvious IMO)
- how can we increase the minimum wind for our foilkite to stay at zenith without special care nor working the kite.
My point of view :
- trim the kite
- get thin and light lines
- play with the camber of the kite : i.e. extend a couple of cm on B and C connections of the speed system (Mixer test) to reduce backstall, up to the start of kite instability (yoyo / fronstall).
Do you agree ? Any other tips ?
Has someone experimenting that flat camber could on the contrary improve this "zenith ability" ?
Regis-de-giens wrote:Regarding the Sonic you are right I suppose ; but in my case I have already optimized the kite weight which is under most (if not all) foilkites and far lighter than speed 5 and sonic 1. So I cannot do much more on that , except using lighter lines, which pushes the limit a bit further (say approx 200 gr which is however approximately the difference between Sonic 1 and 2 ...)
Currently I have no tip collapse, even fully depowered , thanks to a moderate Aspect Ratio. I even fully trim the kite during zenith phases . So ! thanks to my light weight I can start riding when kite hangs "properly" in the air (i.e. with less wind than necessary to maintain a Speed5 in the air even FULLY depowered, I did the back-to-back test).
Side-shore wind would be less a problem, but with my onshore configuration, the main difficulty is keeping the kite in the air the time for me to get away from shore. Body drag is not possible in such light wind, so I need to let go of the bar and swim out rapidly with both hands (on the back), just correcting the kite azimuth now and then to keep it at 180 degrees. This tricky situation last about 1-2 minutes, which increases the risk of a lull, so if I can save some wind for kite hanging in the air I think, I can still ride (with a double loop for waterstart , 30 m lines and big hydrofoil wing). Problem is the same after a fall in the water , the time I recover the Hydrofoil. I have sometime to pull directly on front lines (on top of full depower trim) to keep the kite in the air ( but I loose the kite control during that phase)
Hence my above question : I suppose that more camber will lead to more lift to keep lines taught and would like to get your feedback if some tested the zenith limit of their kite in both configurations (putting aside tips problems) ; or another way to see it : have some of you had to increase the flatness, and noticed how it impacted the backstall when fully depowered ?
Users browsing this forum: No registered users and 5 guests