Encyclopedia Astronautica
Timberwind 250

DoE nuclear/lh2 rocket engine. 2451.6 kN. Development ended 1992. Isp=1000s. Used on Timberwind launch vehicle.

Thrust (sl): 1,912.300 kN (429,902 lbf). Thrust (sl): 195,000 kgf. Engine: 8,300 kg (18,200 lb). Thrust to Weight Ratio: 30.1204819277108.

Status: Development ended 1992.
Unfuelled mass: 8,300 kg (18,200 lb).
Diameter: 8.70 m (28.50 ft).
Thrust: 2,451.60 kN (551,142 lbf).
Specific impulse: 1,000 s.
Specific impulse sea level: 780 s.
Burn time: 493 s.

More... - Chronology...

Associated Countries
See also
Associated Launch Vehicles
  • Timberwind American nuclear-powered orbital launch vehicle. DARPA project. Nuclear fission engine using pebble bed reactor with spherical fuel elements. More...

Associated Manufacturers and Agencies
  • AEC American agency overseeing development of rocket engines and rockets. Atomic Energy Commission, USA. Responsible for development of nuclear weapons and nuclear power applications. Became part of the newly-created Department of Energy in 1971. More...

Associated Propellants
  • Nuclear/LH2 Nuclear thermal engines use the heat of a nuclear reactor to heat a propellant. Although early Russian designs used ammonia or alcohol as propellant, the ideal working fluid for space applications is the liquid form of the lightest element, hydrogen. Nuclear engines would have twice the performance of conventional chemical rocket engines. Although successfully ground-tested in both Russia and America, they have never been flown due primarily to environmental and safety concerns. 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...

Associated Stages
  • Timberwind 250 Nuclear/LH2 propellant rocket stage. Loaded/empty mass 170,000/45,000 kg. Thrust 2,450.00 kN. Vacuum specific impulse 1000 seconds. More...

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