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Originally Posted by aerohead
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.
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Interesting. I've been aware of the usage of WM-50 to prevent hot starts on gas turbines, while on piston-engined aircraft I've been more aware of its usage at high altitude.
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I understood that this was it's sole purpose. Protection against destructive pre detonation.
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That's the most usual purpose on spark-ignited engines, as the water content allows a leaner AFR.