Washout is essentially a decrease in Angle of attack at the tip of the wings. This can be achieved by warping the wing a bit by retensioning the covera bit with aheat gun or iron, so that the trailing edge of the wing tip is about a 1/4 higher than the trailing edge at the root. A similar effect can be obtained by raising the ailerons (assuming strip ailerons) a bit.

A classic stall spin accident on approach to landing involves the aircraft stalling in an uncoordinated turn to final approach. Depending on the presence of a slip or skid, the the inside wing can stall resulting in a nose down spin entry before impact with the ground or the outside wing can stall resulting in an over the top entry into a spin, which again, due to the low altitude at which it occurs, usually results in the plane impacting the ground before the spin can fully develop.