What unique characteristic allows hypergolic propellants like $ ext{UDMH}$ and $ ext{N}_2 ext{O}_4$ to be suitable for reliable maneuvering systems?
Answer
They ignite spontaneously upon contact, requiring no external ignition source.
Hypergolic combinations ignite immediately when they meet, which is ideal for orbital maneuvering systems that must fire reliably after long periods of dormancy.
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