That's the problem. Every year that I grow older (this is the way it is, I know :-) ), this possibility to test it myself slowly escapes my mind.Flyking wrote:looks possible but doing wingover close to the ground with a high performance glider is not a good idea
Welcome to the org, BeezaBeeza wrote: From above the valley in the strong wind, to gain momentum, the pilot Ingo Renner dives down with the wind behind him into the still air, executes
a sharp, on end 180 degree turn, then quickly rolls the glider flat and climbs, heading back into the fast oncoming air. Into what he might justifiably
see as a "headwind".
So what happens if he next does the exact opposite by diving against the wind, to the still air below, then turns 180 degrees and climbs with an
According to the "boat in the river" idea, there should be no difference.
What happens if "flat" climbing from the still air into the "headwind", he comes out of the still air heading at say an angle of 45 to 60 degrees to the
headwind, instead of directly into it? Would the pilot "feel" anything pulling at the glider from one side? Might it seem to steer into the "wind"?
If the climb could continue right through the gradient, higher up into uniformly flowing air, would veering a bit left and then right have the same feel
to it as when the glider was at a lower level, but still climbing into the gradient? Or would it correspond to the earlier "boat manouevring in the river"
or "model aircraft flying in a box" illustrations?
The idea of DS is to go downwind to enter still air with excess if speed, loose as little in turn and go back in the headwind area.Flyingseb wrote: Interesting stuff. The reasoning to the first "what if" is clear to me.
So he's flying in a wind layer, above still air. Let's say he's flying at trim, 20 mph, and the wind is the same velocity, 20 mph. Flying directly into the
wind, his ground speed is exactly 0 mph, so is his speed relative to the still air layer. If he enter this layer, then he will fall until the air speed builds
up again to 20 mph, loosing a lot of altitude in the process. Turning 180° will just cause another altitude loss, totally pointless .
Dynamic soaring, lee and windward.AndRand wrote:Point is it is hard to find suitable conditions for HG. Vertical gradient needs vertical trajectory (energy consuming), horizontal gradients (IE. between ridge lift and lee side rotor) are usually too small.
I think one of imaginable trajectory would be not circular but spiral ie along ridge.
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