Encyclopedia Astronautica
End Hall Thruster


UM-NASA electric/lh2 rocket engine. 1 kW arcjet, ran on H2, N2, or a mixture, at about 12A, 1 kW, peak around 600s Isp, (20-30% efficiency). Isp=600s.

Electrical Input Power: 1.00 kW.

Specific impulse: 600 s.

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Associated Countries
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Associated Manufacturers and Agencies
  • UM-NASA American manufacturer of rocket engines. UM-NASA, USA. More...

Associated Propellants
  • Electric/LH2 The many versions of electric engines use electric or magnetic fields to accelerate ionized elements to high velocity, creating thrust. The power source can be a nuclear reactor or thermal-electric generator, or solar panels. Liquid hydrogen was identified by all the leading rocket visionaries as the theoretically ideal rocket fuel. It had big drawbacks, however - it was highly cryogenic, and it had a very low density, making for large tanks. The United States mastered hydrogen technology for the highly classified Lockheed CL-400 Suntan reconnaissance aircraft in the mid-1950's. The technology was transferred to the Centaur rocket stage program, and by the mid-1960's the United States was flying the Centaur and Saturn upper stages using the fuel. It was adopted for the core of the space shuttle, and Centaur stages still fly today. More...

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