Andreas Maurer wrote in message . ..


I don't think that the scenario you describe can lead to a wing stall:
The cause that returns the wing to normal deflection is of course that
the pilot reduces AoA by pushing the stick forward. The instance the
pilot reduces g-load this way he also reduces his stall speed - I
doubt that it's possible to stall if the pilot was able to pull a
high-g pull-up only one second before without having a highspeed
stall. Of course the relative AoA-rise indeed occurs when the wing
tips are moving downwards, but the overall AoA is reduced a lot more
with the elevator (otherwise he woudn't lower the AoA enough to cause
the rapid unbending of the wing).

I couldn't find the photos last night so I can't attempt any
measurements of wing deflection. The scenario I imagine is this. The
pilot makes an agressive contest finish pull up. The pull up starts
at over 100kts, the pilot continues to pull as the speed decays to say
60kts where the wing experiences an accelerated stall. The reduction
in lift causes the wings to start to unflex. What happens next
depends on how well the glider is coordinated and how quickly the
pilot pushes forward to exit the accelerated stall. Isn't it possible
that the push forward makes the wings unflex at a rate that leaves the
tips stalled?

Andy