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BrF5/Hydyne
BrF5/Hydyne 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. Hydyne was a propellant blend pushed rather vigorously by the Redstone arsenal in the late 1950's, but it found little application.

Specific impulse: 227 s. Specific impulse sea level: 227 s.

Optimum Oxidizer to Fuel Ratio: 3.85. Temperature of Combustion: 3,195 deg K. Density: 1.78 g/cc. Oxidizer Density: 2.480 g/cc. Oxidizer Freezing Point: -63 deg C. Oxidizer Boiling Point: 41 deg C. Fuel Density: 0.860 g/cc. Fuel Freezing Point: -84 deg C. Fuel Boiling Point: 64 deg C.

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