Transtage
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Transtage, given the United States Air Force designation SSB-10A, was an American upper stage used on Titan III rockets, developed by Martin Marietta and Aerojet.
History
Transtage was developed in anticipation of a requirement to launch military payloads to geostationary orbit; a contract for development of the stage was issued on 20 August 1962.[1] Transtage used a pressure-fed two-chamber configuration, using Aerozine 50 fuel and nitrogen tetroxide as oxidizer; the thrust chambers were gimbaled for steering and each produced Script error: No such module "convert". of thrust.[2] The design specification required up to three restarts during the first six hours of a mission.[3]
Forty-seven Titan III launches are known to have used Transtage upper stages;[4] of those, three are known to have suffered launch failures.[5] The first launch, boosted by a Titan IIIA, occurred on 1 September 1964;[6] the Transtage failed to pressurize, resulting in premature engine cutoff, and a failure to reach orbit.[5] The second launch, on 10 December, was successful, and all ensuing launches used the Titan IIIC launch vehicle. The last launch of a Transtage was on 4 September 1989, boosted by a Titan 34D rocket.[5]
See also
References
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