Encyclopedia Astronautica
Hermes A-1-1


Nitric acid/Amine propellant rocket stage. Loaded mass 5,000 kg. Thrust 71.00 kN. Nitric acid/Tonka propellants.

Status: Retired 1951.
Gross mass: 5,000 kg (11,000 lb).
Height: 7.80 m (25.50 ft).
Diameter: 0.86 m (2.82 ft).
Thrust: 71.00 kN (15,961 lbf).
Number: 5 .

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Associated Countries
Associated Engines
Associated Launch Vehicles
  • Hermes A-1 The Army Hermes A-1 single stage test rocket was an American version of the German Wasserfall anti-aircraft rocket. More...

Associated Manufacturers and Agencies
  • GE American manufacturer of rockets, spacecraft, and rocket engines. General Electric Corporation, USA. More...

Associated Propellants
  • Nitric acid/Amine Drawing on the German World War II Wasserfall rocket, nitric acid (HNO3) became the early storable oxidiser of choice for missiles and upper stages of the 1950's. To overcome various problems with its use, it was necessary to combine the nitric acid with N2O4 and passivation compounds. These formulae were considered extremely secret at the time. By the late 1950's it was apparent that N2O4 by itself was a better oxidiser. Therefore nitric acid was almost entirely replaced by pure N2O4 in storable liquid fuel rocket engines developed after 1960. Early storable rocket systems sought to improve ignition characteristics and perforamance by eliminating the kerosene portion of the fuel. An amine is an organic compound produced when one or more hydrogen atoms of ammonia is replaced with organic groups. Mixed amine fuels were first developed by the Germans in World War II. TONKA-250, developed for the Wasserfall rocket, was used by the Russians after the war in various engines under the specification TG-02. More...

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