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S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...

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- 43-<br />

Main Performance of Bipropellant <strong>Systems</strong><br />

Thrust level: 4 ÷ 500N for satellites, up <strong>to</strong> 45 000 N for general spacecraft application<br />

Impulse bit: ≥ 10 -2 Ns (with thruster minimum on-time of 20 ms)<br />

Thruster-spec. Impulse: ≤ 2850 Ns/kg for F ≤ 25N (for steady state operation)<br />

≤ 3110 Ns/kg for F ≤ 400N<br />

Thruster-spec. Impulse: ≥ 1000 Ns/kg (for pulse mode operation)<br />

System-spec. Impulse: ≤ 2800 Ns/kg<br />

Advantages<br />

Higher Thruster-spec. Impulse, Isp (≤ 3110 Ns/kg)<br />

Higher System-spec. Impulse Issp (≤ 2800 Ns/kg) resulting in low system mass<br />

High thrust capability, up <strong>to</strong> 45 000 N<br />

Disadvantages<br />

Bipropellant system complexity with added valves, regula<strong>to</strong>rs, etc.<br />

Higher cost in comparison <strong>to</strong> monopropellant hydrazine systems.

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