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Bell 8247
Part of Bell 8000
Bell Nitric acid/UDMH rocket engine. Out of Production. Version of Agena engine for the Gemini-Agena Target Vehicle. Minimum capability of five restarts and a demonstrated capability of fifteen restarts. First flight 1963.
AKA: XLR81-BA-13. Status: Out of Production. Date: 1962-1964. Number: 248 . Thrust: 71.20 kN (16,006 lbf). Unfuelled mass: 132 kg (291 lb). Specific impulse: 291 s. Burn time: 240 s. Diameter: 1.52 m (4.98 ft).
The Gemini-Agena Target Vehicle design was an adaptation of the basic
Agena-D vehicle using the alternate Model 8247 rocket engine and additional
program-peculiar equipment required for the Gemini mission. The XLR-8I-BA-13 was a liquid bi-propellant rocket
engine with a minimum capability of five starts and a demonstrated capability of fifteen starts under vacuum conditions.
This rocket engine consisted of the following major components:
- Thrust-chamber assembly
- Multiple-restart assembly
- Turbine-pump assembly
- Overspeed shutdown electronic-gate and cable assembly
- Turbine-exhaust duct
- Propellant manifolds
- Thrust-chamber nozzle extension
Fuel used was unsymmetrical dimethylhydrazine (UDMH); oxidizer used was
inhibited red fuming nitric acid (IRFNA). The propulsion system provided
the thrust necessary to place the GATV into a selected orbit and to accomplish
major orbital changes. A minimum of five starts was available for performing
these maneuvers.
Engine: 132 kg (291 lb). Chamber Pressure: 34.00 bar. Area Ratio: 45. Propellant Formulation: RFNA/UDMH. Oxidizer to Fuel Ratio: 2.57. Coefficient of Thrust vacuum: 1.829. Restarts: 13.
Family:
Storable liquid.
Country:
USA.
Propellants:
Nitric acid/UDMH.
Agency:
Bell.
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