Unbelievably Speed4s (at least some) appear to be delivered without quality (and line length) control.
I had quite the same issue on both my 8 and 10 with the following symptoms:
- unable to trim it properly (ie, being able to just stall the when standing on the beach in a breeze when pulling the bar completely and depower on "full power")
- stayed at the edge of the window at all times (not nice for wave kiting)
- lack of power (could hardly jump)
- turning on one side when depowering (when the load was on the front line)
The folding always occur when depowering beyond a certain point; it's normal. But my impression is that feature has been reduced on the Speed4s (when adequately tuned!), compared to the Speed3s
Obviously the solution to the first three issues was to lengthen the front lines (with the black line above the depower system), but that made the last problem even worse, because the side safety line being too short (!) was pulling even more then.
My back (steering) lines were a good 10 cm too long (others reported up to 20!), so the fix simply was to make one or two double eight knots on the thicker part of the lines just above the bar (you need to separate the back lines from the bar, needless to say).
Hope this helps.
BTW, the Speed4s (small sizes) are fantastic kites when tuned properly. My 10 practically replaced my Sp3 12.
Hope it helps. Cheers
Sorry for making a new post but I can´t find the solution anywhere else and I´m participating in Red Bull Ragnarok next week.
My speed 4 10m is behaving really strange in the air:
It flies pretty stable on the beach (except I think it flies a bit to far over my head) but when I´m gaining speed on the water the tips starts folding in, really bad, It almost collapses!t