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Hiroc
Part of Atlas Family
American test vehicle, built and flown by Convair in 1945-1947 to test technologies applied to the later Atlas ICBM.

AKA: RTV-A-2. Status: Cancelled 1947.

In 1945 the U.S. Army Air Force awarded Consolidated-Vultee project MX-774, which was to lead to a long-range ballistic missile. The project included proving technologies using a test vehicle, the Hiroc (High-Altitude Rocket) . MX-774 was cancelled in June 1947, but Convair was allowed to complete and fly three test vehicles using available funds. A Reaction Motors XLR35-RM-1 four-chamber liquid-propellant rocket motor was fitted to the rocket's cylindrical body. Four fixed stabilizing fins provided stability. New technologies demonstrated gimbaled rocket nozzles, a separable nose cone, and the balloon internal pressure stabilized flight structure. The missile's skin was very thin, and was inflated by internal pressure like a balloon. Three Hiroc's were flown in July to December 1948. None were entirely successful. However the know-how obtained in designing and building the missiles would be the starting point for the Atlas ICBM just a few years later.


More at: Hiroc.

Family: test vehicle. Country: USA. Engines: LR35. Agency: Convair.

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