Encyclopedia Astronautica
Ariane 4L


N2O4/UDMH propellant rocket stage. Loaded/empty mass 43,772/4,493 kg. Thrust 752.00 kN. Vacuum specific impulse 278 seconds.

Cost $ : 10.000 million.

AKA: L-40.
Status: Retired 2003.
Gross mass: 43,772 kg (96,500 lb).
Unfuelled mass: 4,493 kg (9,905 lb).
Height: 19.00 m (62.00 ft).
Diameter: 2.22 m (7.28 ft).
Span: 2.22 m (7.28 ft).
Thrust: 752.00 kN (169,057 lbf).
Specific impulse: 278 s.
Specific impulse sea level: 248 s.
Burn time: 142 s.
Number: 384 .

More... - Chronology...


Associated Countries
Associated Engines
  • Viking 5C SEP N2O4/UDMH rocket engine. 752 kN. Isp=278s. Used on Ariane 42L, Ariane 44L, Ariane 44LP. First flight 1988. More...

Associated Launch Vehicles
  • Ariane 44LP French orbital launch vehicle. Ariane 4 with 2 liquid rocket + 2 solid rocket strap-ons. More...
  • Ariane 44L French orbital launch vehicle. Ariane 4 with 4 liquid rocket strap-ons. More...
  • Ariane 42L French orbital launch vehicle. Ariane 4 with 2 liquid rocket strap-ons. More...
  • Ariane 42L-3 French orbital launch vehicle. As Ariane 42L but with Ariane H10-3 upper stage. More...
  • Ariane 44LP-3 French orbital launch vehicle. As Ariane 44LP but with Ariane H10-3 upper stage. More...
  • Ariane 44L-3 French orbital launch vehicle. As Ariane 44L but with Ariane H10-3 upper stage. 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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