The S-18 folding wing aircraft is available as a plans or kit built aircraft. It is an all metal 2-place side-by-side aerobatic plane. The basic structure is the same as the proven T-18 Thorp with a wider and longer fuselage. Revised airfoil on the folding wing. Engines approved are 0-290 thru 0-360 allowing cruise performance from 160 to 180 mph.