
Hydyne is a mixture of 60% unsymmetrical dimethylhydrazine (UDMH) and 40% diethylenetriamine (DETA), developed in 1957 at Rocketdyne for use in liquid-fuel rockets. Hydyne was used as the fuel for the first stage of the Juno I rocket that launched Explorer 1, the first successful satellite launch conducted by the United States. == Improved perform...
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http://en.wikipedia.org/wiki/Hydyne

A rocket fuel comprised of 60% UDMH and 40% diethylene-triamine.
Found on
http://www.braeunig.us/space/glossary.htm
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