Specific Impulse

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Thrust = Isp * dm/dt * g0 [Newtons, g0=9.80665 m/s^2]

Isp = ve/g0 [seconds]

ve is the average exhaust velocity along the axis of the engine. ve = vexhaust + Area*(p_exhaust - p0)/(dm/dt)

Boeing: Rocketdyne: Space Shuttle Main Engine

Max Thrust in Vacuum = 512300 lb

Specific Impulse in Vacuum = 452 seconds * 9.80665 = 4432.6058 m/sec

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