Rabouyt D2

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Rabouyt D2
Alpavia D2 Rabouyt Heliplane F-WSSL LEB 5.6.71 edited-2.jpg
The prototype Rabouyt D2 "Heliplane" displayed at the June 1971 Paris Air Show.
Role Two seat hybrid helicopter/autogyro
National origin France
Manufacturer Rabouyt
Introduction 1971
Number built 1

The Rabouyt D2 was a two seat autogyro but its rotor was engine driven for vertical take-offs. In level flight the aircraft was powered by the same engine driving a shrouded, pusher configuration propeller. It was designed and built in France in the early 1970s.

Design and development[edit]

The D2 was primarily an autogyro driven by a pusher configuration, shrouded propeller whilst supported by an autorotatiing undriven two blade rotor. It was unusual in that the rotor could be powered, by the same engine that drove the propeller, during a vertical take-off phase to overcome the autogyro's normal limiting need for a take-off run.[1]

The D2's main rotor had constant chord blades of laminated wood, covered with geodesic glass fibre fabric. They were pillar mounted, together with a torque limiting coupler, at mid fuselage between the cabin and engine compartment. The fuselage was a steel-chromium-vanadium pod, with two side by side seats in a cabin glazed to the nose and accessed by a forward opening door on each side. The pusher configuration engine was mounted behind the cabin, driving a four blade propeller turning within a circular, aerofoil shroud supported by a ventral pod extension and braced to the rotor pillar. A vertical tail consisting of a small fin and large rudder was mounted on a boom from the lower fuselage. The D2 landed on a fixed tricycle undercarriage, each wheel within a streamlined fairing on a cantilever leg. The nosewheel was steerable via the rudder pedals.[1]

The Rabouyt D2 first appeared in public at the Paris Air Show of 1971, though it is not known if the aircraft had flown by this date. For early testing it was fitted with a low powered engine which was being replaced in early 1973 by a 150 hp flat-four of unspecified type.[2] It is not known if it was flown.

Specifications[edit]

Data from Jane's All the World's Aircraft 1974-75[1] All performance figures are estimates at the maximum take-off weight.

General characteristics

  • Crew: Two
  • Length: 5.29 m (17 ft 4 in) without rotors
  • Width: 2.36 m (7 ft 9 in) overall
  • Height: 2.45 m (8 ft 0 in) overall
  • Max takeoff weight: 750 kg (1,653 lb)
  • Powerplant: 1 × flat-four , 110 kW (150 hp)
  • Main rotor diameter: 10.00 m (32 ft 10 in)
  • Main rotor area: 78.5 m2 (845 sq ft) two blade
  • Propellers: 4-bladed shrouded

Performance

  • Cruising speed: 180 km/h (112 mph; 97 kn)
  • Minimum control speed: 30 km/h (19 mph; 16 kn)
  • Range: 720 km (447 mi; 389 nmi)

References[edit]

  1. ^ a b c Taylor, John W R (1974). Jane's All the World's Aircraft 1974-75. London: Jane's Yearbooks. p. 81. ISBN 0 354 00502 2. 
  2. ^ "Rabouyt". Flight: p.165. 1 February 1973.