LE-7 - LE-7A - LE-7A Specifications

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