[4] Baynes' Scud 3 was designed specifically to include such a launching aid but was also capable of high performance engineless flight.

The single cockpit was well ahead of the wings and their mounting pylon had a fairing which extended aft of the trailing edge and contained the engine.

He encouraged Villiers to persuade this engine to run inverted, in order to put the propeller line to the top of the mounting and thus minimise air resistance.

The engine was hung to the top of the pylon bulkhead, just ahead of the trailing edge, on a diagonally cross-braced pair of tubes from the hinge to the crankcase and with V-tubes to the cylinder head.

The engine was held in position by a diagonal longitudinal member attached to a nut on a screw thread which could be rotated with a crank in the cockpit.

As the lower end of this member moved forward, the engine rotated into the horizontal position, its fairing closing the fuselage opening.

The propeller was indexed to stop in a vertical position and its lower tip moved forward on retraction into a slot in the bulkhead, whilst the other blade pressed on a lever that caused hinged fairing doors, previously held open with springs, to close over it.

Photographs from the 1930s and '40s suggest that at some point the closing mechanism of the rear fairing was altered and a fixed slot provided for the propeller.