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Characteristic velocity
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Characteristic velocity or c∗ , or C-star, pronounced "see star," is a measure of the combustion performance of a rocket engine independent of nozzle performance, and is used to compare different propellants and propulsion systems.
Formula
c∗=p1×Atm˙
c∗ is the characteristic velocity (meters/second)
p1 is the chamber pressure (pascals)
At is the area of the throat (square meters)
m˙ is the mass flow rate of the engine (kilograms per second)
