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BrF5/UDMH
BrF5/UDMH propellant. No engines reached the operational stage using this storable propellant combination. The handling problems and safety risks of the toxic bromine pentafluoride oxidizer outweighed the performance benefits. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's.

Specific impulse: 231 s. Specific impulse sea level: 231 s.

Optimum Oxidizer to Fuel Ratio: 3.8. Temperature of Combustion: 3,220 deg K. Density: 1.72 g/cc. Oxidizer Density: 2.480 g/cc. Oxidizer Freezing Point: -63 deg C. Oxidizer Boiling Point: 41 deg C. Fuel Density: 0.793 g/cc. Fuel Freezing Point: -57 deg C. Fuel Boiling Point: 63 deg C.

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