hypergolic - meaning and definition. What is hypergolic
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What (who) is hypergolic - definition

COMBINATION USED IN A ROCKET ENGINE WHOSE COMPONENTS SPONTANEOUSLY IGNITE WHEN THEY COME INTO CONTACT WITH EACH OTHER
Hypergolic; Hypergol; Hypergolic fuel; Hypergolic-fuel; Hypergolic compound; Hypergolicity
  • The attendant wears a full [[hazmat suit]] due to the hazards of the hypergolic fuel [[hydrazine]], here being loaded onto the ''[[MESSENGER]]'' space probe.
  • Hypergolic propellant tanks of the [[Orbital Maneuvering System]] of Space Shuttle ''Endeavour''
  • An early hypergolic-propellant rocket engine, the Walter 109-509A of 1942–45.

hypergolic         
[?h??p?'g?l?k]
¦ adjective (of a rocket propellant) igniting spontaneously on mixing with another substance.
Origin
1940s: from Ger. Hypergol, prob. from hyper- + Gk ergon 'work' + -ol.
Hypergolic propellant         
A hypergolic propellant combination used in a rocket engine is one whose components spontaneously ignite when they come into contact with each other.

Wikipedia

Hypergolic propellant

A hypergolic propellant is a rocket propellant combination used in a rocket engine, whose components spontaneously ignite when they come into contact with each other.

The two propellant components usually consist of a fuel and an oxidizer. The main advantages of hypergolic propellants are that they can be stored as liquids at room temperature and that engines which are powered by them are easy to ignite reliably and repeatedly. Common hypergolic propellants are difficult to handle due to their extreme toxicity and/or corrosiveness.

In contemporary usage, the terms "hypergol" and "hypergolic propellant" usually mean the most common such propellant combination: dinitrogen tetroxide plus hydrazine.

Examples of use of hypergolic
1. The second stage has 3' tonne of the same hypergolic liquid propellant.
2. The first stage, GS1, comprises a core motor with 138 tonne of solid propellants and four strap–on motors, each with 42 tonnes of hypergolic liquid propellant.