Stall flutter is the result of the elastic axis of a wings surface being aft of the aerodynamic center, resulting in instability. A vicious cycle of lift, twist, stall and lift may ensue.
Earlier this year, columnist Dave Martin had the opportunity to fly Flight Designs CTSW (short wing) factory-built Light Sport Aircraft. This month, he flies the company's new CTLS (Light Sport model), and he details the differences between the two.