S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
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Thruster-specific Impulse<br />
F<br />
I sp = [Ns/kg]<br />
o<br />
m<br />
Isp = thruster specific impulse [Ns]<br />
F = thrust force [N]<br />
o<br />
m = Propellant mass flow rate [kg/s]<br />
- 8-<br />
Specific impulses are often quoted in units of seconds, corresponding <strong>to</strong> a modification of the<br />
above definition <strong>to</strong> that of the impulse delivered per unit of weight of propellant.<br />
The values in seconds then follow from those in Ns/kg by division with the gravitational<br />
acceleration standard, g (=9.82 m/s 2 ).<br />
with:<br />
I sp<br />
o<br />
=<br />
F<br />
o<br />
mg<br />
0<br />
o<br />
m g = w<br />
=<br />
F<br />
o<br />
w<br />
[s]<br />
0 [kp/s] in propellant weight flow unit