Encyclopedia Astronautica
Snapshot


EOS electric/cesium rocket engine. 8.5 mN. In Development, 1962-1964. Isp=5100s. Launched on Blue Scout Junior launch vehicle on Snapshot test; a contact ionization engine; thruster anode diameter was 5 cm.

The thruster for the Snapshot test was a contact ionization engine using cesium propellant. The thruster anode diameter was 5 cm, and a barium-coated wire filament neutralizer was used. Beam power supply voltage was 4500 V, and the power per thruster was 0.4 kW, producing 8.5 mN thrust at a specific impulse of 5100 seconds. The Snapshot engine operated in space stably for about an hour, but continuous arcing at the high voltage terminals induced severe electromagnetic interference in other spacecraft systems.

Electrical Input Power: 0.40 kW.

Status: In Development, 1962-1964..
Thrust: 0.0085 N (0.0019 lbf).
Specific impulse: 5,100 s.
First Launch: 1964.

More... - Chronology...


Associated Countries
See also
Associated Launch Vehicles
  • Blue Scout Junior American suborbital launch vehicle. Smaller Air Force version of Scout used for suborbital military tests. More...

Associated Manufacturers and Agencies
  • EOS Electro-Optical Systems, Queanbeyan, NSW, Australia. More...

Associated Propellants
  • Electric/Cesium 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. More...

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