An unfired Isayev S2.720A bi-propellant regenerative thrust chamber
developed for use in the second stage of the Soviet S-75M Surface to Air
Missile (SAM) system and produced by the Isayev Design Bureau. This
chamber burns a hypergolic mixture of triethylamine/xylidine (fuel) with
nitric acid as the oxidizer and is rated at 34 KN vacuum thrust.
Chamber measures 40″ tall with the nozzle having an 8.5″ diameter. All
parts are numbered, with the affixed metal label reading “CZ 720 0000-0
204420.” The chamber is also bolted to a four-legged display stand with
an overall height of 45″. In fine condition.
Alexei Isayev
specialized in small-scale, liquid-fuelled rocket engines for Soviet
manned and unmanned spacecraft. From 1957 to 1967 his engines powered
the rockets carrying the first artificial satellites, the first man in
space, and the first unmanned probes to the Moon and Venus. At the same
time, in the 1950s, he was working on engines for surface-to-air
missiles (SAMs) and air-to-sea missiles. An unusual artifact of the Cold
War and a reminder that the space programs were largely an offshoot of
military research and development. RR Auction COA.
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