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sci.specific-impulse-Isp Calculator
Calculates rocket specific impulse Isp = ve/g₀ in seconds from exhaust velocity and converts to effective exhaust velocity. SpaceX Merlin 1D vacuum: Isp = 311 s; RS-25 (Space Shuttle main engine): 453 s — LOX/LH₂ gives highest chemical Isp (450–480 s); hydrazine monopropellant: 220 s.
Inputs
Ve M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
P E Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
P A Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Mdot Kg S
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
Ae M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
thrust F (kN)
Forward propulsive force generated by the engine or motor. Net thrust = gross thrust minus inlet momentum drag.
specific impulse Isp (s)
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.
effective exhaust velocity c* (m/s)
Reference formula or conversion factor shown for context.
F = ṁ·Ve + (Pe−Pa)·Ae
Reference formula or conversion factor shown for context.
pressure thrust term (Pe−Pa)·Ae (kN)
Forward propulsive force generated by the engine or motor. Net thrust = gross thrust minus inlet momentum drag.
Isp context
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.