No need to pump. There’s no reason you can’t set any given AoA at or bellow the stall AoA of the profile through the backlines.JS wrote:The only way that kite will experience AoA greater than the downwind angle is during the early stage of backstall. If not corrected by sheeting out (to 4 degree AoA or less), it'll crash.lobodomar wrote:Of course it can. All you need to do is pull-in the backlines through the control bar. No conservation of energy, you use your muscles.JS wrote: 2. The AoA can never be greater than the downwind (glide) angle (and could only be equal to it if L/D was infinite). If you don't know why, get educated in the law of conservation of energy as it relates to aerodynamics. (Really educated, not just a bit Googled).
You can pump the bar in and out, of course, cycling between backstall and recovery. Not efficient, but you can do it.
For the example above, if you set an AoA of 18dg, standing still, kite at 12 oclock, all your “downwind angle” means is that the angle between the vertical and the line connecting the harness to the center of pressure of the kite is almost 9dg (not taking the weight of the kite and lines into consideration).
And come on, with your “actual” stall AoA of 4dg and considering that at that AoA the L/D is already starting to drecrease exponentially, it’s actual operational AoA range would be ridiculous.
But you don’t have to believe me. Just fly a perfectly trimmed kite in a steady breeze,12 oclock, standing still, at the threshold of stall. Sheet out a little (EDIT: or even a lot, since most properly designed control bar “depower travels” do not allow AoAs lower than that of optimum L/D to be reached – strutless inflatables being the most evident exception to this general rule), and see what happens with the “downwind angle”.