Nick Gilbert wrote:
People wind the flap away upon flair to help make the landing stick (stall
speed goes up, wing stops flying). Obviously, it also gives better aileron
response.

I agree completely with the effects of raising the flap, but not the
reasons given. What makes the glider "stick" is the reduction in lift
when the flap is raised, not any change in stall speed; in fact, raising
the flap makes the wing less likely to stall because a greater fuselage
angle of attack is now needed to stall. With the glider on the ground,
this angle of attack can't be achieved, as a recent thread made clear.
And this allows the wing to fly longer, enabling the pilot to control it
to a lower speed. (By "fly", I mean produce lift).

--
Change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA