Encyclopedia Astronautica
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.

Thrust (sl): 43.200 kN (9,712 lbf). Thrust (sl): 4,407 kgf. Thrust to Weight Ratio: 0.

Status: Out of production.
Diameter: 1.45 m (4.75 ft).
Thrust: 49.00 kN (11,015 lbf).
Specific impulse: 295 s.
Specific impulse sea level: 260 s.
Burn time: 135 s.
Number: 4 .

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Associated Countries
See also
Associated Launch Vehicles
  • CZ-4A Chinese orbital launch vehicle. The CZ-4 was developed and manufactured by the Shanghai Academy of Spaceflight Technology. Its first stage was essentially the same as that of the CZ-3 and the second stage was identical to that of the CZ-3. The CZ-4's third stage, however, was a development, featuring a thin wall common intertank bulkhead tankage and two-engine cluster with both engines gimbling about two perpendicular axes. The third stage engine cluster connected to the tank aft bulkhead through the engine bay. The CZ-4 had two payload fairing configurations: Type-A and Type-B. The CZ-4 was designed for launching satellites into polar and sun-synchronous orbits. More...

Associated Manufacturers and Agencies
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...

Associated Stages
  • CZ-4B-3 N2O4/UDMH rocket stage. 98.10 kN (22,054 lbf) thrust. Mass 15,200 kg (33,510 lb). More...
  • CZ-4A-3 N2O4/UDMH propellant rocket stage. Loaded/empty mass 15,150/1,000 kg. Thrust 100.81 kN. Vacuum specific impulse 303 seconds. More...

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