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MW 50
MW 50 (Methanol-''Wasser'' 50) was a 50-50 mixture of methanol and water (German: ''Wasser'') that was often sprayed into the supercharger of World War II aircraft engines primarily for its anti-detonant effect, allowing the use of increased boost pressures. Secondary effects were cooling of the engine and charge cooling. Higher boost was only effective at altitudes below the full-throttle height, where the supercharger could still provide additional boost pressure that was otherwise wasted, while the smaller secondary effects were useful even above that altitude.
==Composition==
MW 50 is something of a misnomer, as it is actually a mixture of three fluids: 50% methanol acting primarily to achieve optimum anti-detonant effect, secondarily as an anti-freeze; 49.5% water; and 0.5% ''Schutzöl'' 39, an oil-based anti-corrosion additive. The similar MW 30 increased the water to 69.5% and decreased methanol to 30%.〔Bridgeman 1989, p. 296.〕 This increased the cooling performance but made it easier to freeze, the mixture intended to be used for lower-altitude missions. EW 30 and EW 50 mixtures also existed, which substituted methanol with ethanol; in emergency, pure water could be used.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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