07/31/2012. Remarks by Walter van Tilborg: "This original design single-seat light helicopter of Buford John Schramm was intended for amateur construction. The type was marketed in kit form by RotorWay, Inc and it had been developed from the Schramm Javelin prototype, first flown in 1965. The first Scorpion made the first flight in the late 1960s and was powered by a 65 hp Mercury 6500SS modified outboard engine and featured an open cockpit.
A small number of Scorpion aircraft was built and in 1971 an improved model was introduced with better (aluminium) rotor blades, a longer tail boom and an 115 hp Evinrude Vulcan V-4 engine, a strengthened drive system and an enclosed cabin. During 1971 one aircraft with an 140 hp Vulcan V-4 engine was evaluated by the US Army. Examples of the Scorpion 1 were built with open or with a semi-enclosed cabin.
Sheldon Mortenson built this Scorpion I in 1970 and made only minor changes, including replacement of the wheel with skids. Mortenson donated his black enamel finished Scorpion to the EAA museum in 1981."