What characteristic defines hypergolic storable propellants like Aerozine 50 and Nitrogen Tetroxide ($ ext{N}_2 ext{O}_4$)?

Answer

They ignite spontaneously upon contact with their oxidizer

Hypergolic propellants are distinguished by their self-igniting nature. When the fuel, such as Aerozine 50 (a hydrazine derivative), comes into contact with the designated oxidizer, such as Nitrogen Tetroxide ($ ext{N}_2 ext{O}_4$), combustion occurs instantly without any need for an external ignition system, like a spark or pyrotechnic charge. This property makes them exceptionally reliable for critical applications like orbital maneuvering systems (OMS) or long-duration missions where an engine must fire successfully after sitting idle for extended periods. The primary drawback of these storable chemicals is their high toxicity and corrosive nature, necessitating stringent safety protocols.

What characteristic defines hypergolic storable propellants like Aerozine 50 and Nitrogen Tetroxide ($ ext{N}_2 ext{O}_4$)?

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