LE-7A Specifications
- Operational Cycle: staged combustion
- Fuel: hydrogen
- Oxidizer: liquid oxygen
- Mixture ratio (oxidizer to fuel): 5.90
- Short nozzle:
- Rated thrust (sea level): 843 kN (190,000 lbf)
- Rated thrust (vacuum): 1,074 kN (241,000 lbf)
- Specific impulse (sea level):
- Specific impulse (vacuum): 429 seconds
- Long nozzle:
- Rated thrust (sea level): 870 kN (200,000 lbf)
- Rated thrust (vacuum): 1,098 kN (247,000 lbf)
- Specific impulse (sea level): 338 seconds
- Specific impulse (vacuum): 440 seconds
- Dry mass: 1,800 kg (4,000 lb)
- Length:
- short nozzle = 3.2 m
- long nozzle = 3.7 m
- Throttle capability: 72-100%
- Thrust-to-weight: 65.9
- Nozzle area ratio: 51.9:1
- Combustion chamber pressure: 12.0 MPa (1,740 psi)
- Liquid hydrogen turbopump: 41,900 rpm
- Liquid oxygen turbopump: 18,300 rpm