alcohol / water
In Vietnam, we mixed methanol-alcohol and demineralized water together, for use in the Douglas A1 Skyraider, to protect the radial engine during high ordnance load takeoff. Once aloft, any remaining solution was jettisoned to conserve weight. I understood that this was it's sole purpose. Protection against destructive pre detonation.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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