The HM7B from Arianespace is an Upper-Stage Satellite Launch Vehicle Cryogenic Engine with a vacuum thrust of 64.8 kN and a specific impulse of 446 s. This engine uses LOX-LH2 propellants to generate thrust and has a propellant flow rate of 14.8 Kg/s. It has a mixing ratio of 4.9 and a TP rotational speed of 60,800 rpm. The HM7B cryogenic engine powers the cryogenic upper stage of Ariane 5 ECA and has recorded a run of 148 consecutive successes. It has a mass of 165 Kg and measures 2.01 m (height).
