HM7B
Type: Upper Stage Engine
Country of Origin: France
Manufacturer: Snecma
First Flight: May 31, 1986
Status: Active
Propellant (O/F): Liquid Oxygen/Liquid Hydrogen
Mixture Ratio (O/F by mass): 5.0
Cycle: Gas-generator
Chambers: 1
Thrust (vac.): 64.8 kN
Thrust (s.l.):
Throttle: Fixed
ISP (vac.): 446 s
ISP (s.l.):
Chamber Pressure: 536 psi (37 bar)
Nozzle Ratio: 83:1
Burn time: 950 sec.
Ignitions: 1
Mass: 165 kg
Length: 2.1 m
Diameter: 0.99 m
Used in: Ariane 2, 3, 4, 5
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