RE: Wing washout ??
From the RCU glossary:
This term is used to describe a designed warp in the wing of an airplane. The warp makes the angle of attack more steep at the wing tips than at the root of the wing. This helps prevent tip stalls.
Actually, P-40 driver is correct and it should read "lower angle of attack". The glossary is incorrect.
Basically the wing chordline at the wing root has a higher angle than the tip ribs. This causes the wing centersection to stall before the tips and reduces "tip stall" tendencies. As you flair for landing the center stalls and the tips keep flying longer. EDITED TO CORRECT