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I have heard of alcohol and/or water injection for years. I think that some aircraft used it in the 40's.



Garrett used water-methanol injection in their TPE-331 turboprop engine mounted in a Fairchild Metroliner. 60% +/- 2% methanol, 40% +/- 2% water mixture. Increased shaft horsepower from 1000 to 1100 at sea level. The aircraft are still being used to this day at FedEx/UPS cargo feeder airlines.