Encyclopedia Astronautica

N2O4/UDMH rocket stage. 98.10 kN (22,054 lbf) thrust. Mass 15,200 kg (33,510 lb).

AKA: L14-YF40.
Status: Active.
Gross mass: 15,200 kg (33,500 lb).
Unfuelled mass: 1,000 kg (2,200 lb).
Height: 1.90 m (6.20 ft).
Diameter: 2.90 m (9.50 ft).
Thrust: 98.10 kN (22,054 lbf).
Burn time: 303 s.
Number: 17 .

More... - Chronology...

Associated Countries
Associated Engines
  • YF-40 Beijing Wan Yuan N2O4/UDMH rocket engine. 49 kN. Out of production. Isp=295s. Used on CZ-4A launch vehicle. First flight 1988. More...

Associated Launch Vehicles
  • CZ-4B Chinese orbital launch vehicle. The CZ-4B introduced in 1999 was an improved model of the CZ-4B with an enhanced third stage and fairing. It measured 44.1 metres in length with a first stage thrust of 300 tonnes. More...

Associated Manufacturers and Agencies
  • SAST Shanghai Academy of Spaceflight Technology, Shangai, China. 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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