wrote in message
...

The planform of the wing has a huge effect on stall behavior.
If this is a rectangular wing, like a Cub or Champ, washout isn't
usually necessary since the stall will start at the root anyway. If
it's tapered or elliptical, washout is necessary to get the stall
started at the root. It will start around midspan otherwise, and
aileron effectiveness at low speed is lost. Some aerobatic airplanes
have tapered or elliptical wings with no washout, but they're not for
the average weekend flier. The stall characteristics can be very
abrupt to get quick snap rolls and so forth.

Even with washout, the Emeraude (elliptical planform - 23012 airfoil) will
stall fairly abruptly. Like, at 50 you're flying - at 49 you're not.

Rich S.