Encyclopedia Astronautica
Ariane 4-1


N2O4/UDMH propellant rocket stage. Loaded/empty mass 245,900/17,900 kg. Thrust 3,034.10 kN. Vacuum specific impulse 278 seconds.

Cost $ : 20.000 million. No Engines: 4.

AKA: L-220.
Status: Retired 2003.
Gross mass: 245,900 kg (542,100 lb).
Unfuelled mass: 17,900 kg (39,400 lb).
Height: 23.60 m (77.40 ft).
Diameter: 3.80 m (12.40 ft).
Span: 8.30 m (27.20 ft).
Thrust: 3,034.10 kN (682,093 lbf).
Specific impulse: 278 s.
Specific impulse sea level: 248 s.
Burn time: 205 s.
Number: 187 .

More... - Chronology...


Associated Countries
Associated Engines
  • Viking 2B SEP N2O4/UDMH rocket engine. 720 kN. Isp=278s. Used on Ariane 2/3. First flight 1984. 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 40 French orbital launch vehicle. 3 stage core vehicle with original Ariane H10 upper stage. A fully fueled Ariane core cannot lift off the ground without strap-on liquid or solid motors. When Ariane 4 is launched in this configuration, the propellant tanks of the first and second stages are not completely filled. More...
  • Ariane 42P French orbital launch vehicle. Ariane 4 with 2 solid rocket strap-ons. More...
  • Ariane 44P French orbital launch vehicle. Ariane 4 with 4 solid rocket strap-ons. More...
  • Ariane 40-3 French orbital launch vehicle. 3 stage core vehicle with Ariane Ariane H10-3 upper stage. 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 42P-3 French orbital launch vehicle. As Ariane 42P but with Ariane H10-3 upper stage. More...
  • Ariane 44P-3 French orbital launch vehicle. As Ariane 44P 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...
  • Ariane 44LP-3 French orbital launch vehicle. As Ariane 44LP 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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