Encyclopedia Astronautica
Diamant B-1

N2O4/UDMH propellant rocket stage. Loaded/empty mass 21,500/3,500 kg. Thrust 396.52 kN. Vacuum specific impulse 251 seconds.

Cost $ : 4.000 million. No Engines: 4.

AKA: L-17.
Status: Out of production.
Gross mass: 21,500 kg (47,300 lb).
Unfuelled mass: 3,500 kg (7,700 lb).
Height: 14.08 m (46.19 ft).
Diameter: 1.40 m (4.50 ft).
Span: 2.30 m (7.50 ft).
Thrust: 396.52 kN (89,142 lbf).
Specific impulse: 251 s.
Specific impulse sea level: 221 s.
Burn time: 110 s.
Number: 11 .

More... - Chronology...

Associated Countries
Associated Engines
  • Vexin C SEP N2O4/UDMH rocket engine. 99.1 kN. Out of production. Isp=251s. Used on Diamant B launch vehicle. First flight 1970. More...

Associated Launch Vehicles
  • Diamant B French orbital launch vehicle. As a follow-on to the Diamant-A, CNES decided to evolve a more capable launch vehicle. The Diamant-B used a new first stage with 50% more propellants and 33% more thrust; the same second stage; and a fatter third stage. Six Diamant-B boosters were ordered. Originally four of these were to be used to test the Europa 2 launch vehicle's Perigee-Apogee System. These tests were cancelled and instead CNES used five of the six boosters for orbital attempts. More...
  • Diamant BP.4 French orbital launch vehicle. In January 1972 a further evolution, the Diamant BP.4, was authorized. The second stage was replaced with the P4 Rita motor developed for the MSBS SLBM. The larger 1.38 m diameter fairing developed for the British Black Arrow launcher allowed larger payloads to be accommodated. Three launches of the BP.4 in 1975 completed the Diamant saga. More...

Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

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