Leduc 0.21

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Leduc 0.20
Role Research aircraft
National origin France
Manufacturer Breguet
Designer René Leduc
First flight 7 August 1953
Number built 2

The Leduc 0.21 was a research aircraft built in France in 1953 to refine the practicalities of ramjet propulsion. Initially proposed as the 0.20, it was essentially similar to its predecessor, the Leduc 0.10, but scaled up by around 30%, with tip tanks added to the wings. Again, it was not capable of take-off under its own power, and had to be carried aloft and released.

Two examples were built and completed a very detailed flight test program from 1953 to 1956 to develop automated, operationally viable throttle controls for the ramjet. This included a total of 284 free flights. Designed for subsonic speeds only, the 0.21 reached a top speed of Mach 0.95.


General characteristics

  • Crew: One
  • Length: 12.50 m (41 ft 0 in)
  • Wingspan: 11.60 m (38 ft 1 in)
  • Wing area: 22.0 m2 (237 ft2)
  • Empty weight: 3,300 kg (7,260 lb)
  • Gross weight: 6,000 kg (13,200 lb)
  • Powerplant: 1 × Leduc ramjet, 63.7 kN (14,300 lbf) thrust


  • Maximum speed: 900 km/h (560 mph)



  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 570.
  • World Aircraft Information Files. London: Bright Star Publishing. pp. File 900 Sheet 5.

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