Encyclopedia Astronautica
Delta D


Nitric acid/UDMH propellant rocket stage. Loaded/empty mass 2,693/545 kg. Thrust 33.70 kN. Vacuum specific impulse 278 seconds.

Cost $ : 1.160 million.

Status: Retired 1969.
Gross mass: 2,693 kg (5,937 lb).
Unfuelled mass: 545 kg (1,201 lb).
Height: 5.58 m (18.30 ft).
Diameter: 0.84 m (2.75 ft).
Span: 0.84 m (2.75 ft).
Thrust: 33.70 kN (7,575 lbf).
Specific impulse: 278 s.
Burn time: 170 s.
Number: 24 .

More... - Chronology...


Associated Countries
Associated Engines
  • AJ10-118D Aerojet Nitric acid/UDMH rocket engine. 33.7 kN. Isp=278s. Used on Delta B, Delta C, Delta D upper stages. First flight 1962. More...

Associated Launch Vehicles
  • Delta B American orbital launch vehicle. Three stage vehicle consisting of 1 x Thor DM-21 + 1 x AJ10-118A + 1 x Altair More...
  • Thor Delta C American orbital launch vehicle. Three stage vehicle consisting of 1 x Thor DSV-2A + 1 x Delta D + 1 x Altair 2 More...
  • Delta D American orbital launch vehicle. Four stage vehicle consisting of 3 x Castor + 1 x Thor DSV-2C + 1 x Delta D + 1 x Altair 2 More...
  • Thor Delta C1 American orbital launch vehicle. Three stage vehicle consisting of 1 x Thor DSV-2A + 1 x Delta D + 1 x FW4D More...

Associated Propellants
  • Nitric acid/UDMH Drawing on the German World War II Wasserfall rocket, nitric acid (HNO3) became the early storable oxidiser of choice for missiles and upper stages of the 1950's. To overcome various problems with its use, it was necessary to combine the nitric acid with N2O4 and passivation compounds. These formulae were considered extremely secret at the time. By the late 1950's it was apparent that N2O4 by itself was a better oxidiser. Therefore nitric acid was almost entirely replaced by pure N2O4 in storable liquid fuel rocket engines developed after 1960. 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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