In 1933
Avia introduced two designs based on their earlier training gliders but fitted with low powered engines, placing them amongst the first
motor gliders. The Avia 50-MP (MP for moteur planeur or motor glider) was the more basic of the two and was a development of the
Avia XV-A. The Avia 50-MP was a
monoplane with a two-piece
high wing of rectangular plan, with blunted tips and about 4.5° of sweep. Broad
chord ailerons filled about half the span. The roots were attached to a streamlined,
fuselage mounted pillar, and each wing was braced from about half span to the lower fuselage with a pair of parallel
struts. The pillar also mounted the
pusher configuration Poinsard flat twin engine, its cylinders exposed for air-cooling and driving a two bladed
propeller just behind the wing
trailing edge. The pilot's single, open
cockpit was immediately in front of the wing-mounting pillar in an oval section forward fuselage similar to those of the motorless gliders. The position of the propeller disc just behind the wing required the rear fuselage to be rather shallow, so it was formed by four longerons with
plywood covering, resulting in a rectangular section. The empennage was conventional, with a triangular
tailplane sitting on a low, raised step with a curved leading edge and carrying straight tapered, square tipped,
unbalanced elevators. The rear of the step mounted the rudder hinge bearing a tall, straight tapered and flat topped
balanced rudder. The rudder extended to a rounded heel at the keel via cut-aways in the inner edges of the elevators. The Avia 50-MP landed on an under-fuselage skid fitted with two retractable wheels to facilitate ground handling. The earliest design had always included the possibility of an alternative wheeled
undercarriage and by June 1934, just a month after the first tests, it had been fitted. Each of the normal size wheels were mounted on a V-strut from mid-fuselage, with an axle to the central fuselage underside. The tail was protected by a small bumper. The first flight was piloted by Eric Nessler and took place on 17 May 1934. There are references to its activities in the French glider scene at least until 1938, when it was being used by the L'Air group. ==Specifications ==