Hi all
We use water/meth injection on our Fairchild Metro 3 and 23's. All it does is help recover the lost power from low density air, ie Damm hot ! We use about 30 litres per takeoff on the 2 engines (TPE-331-12U) And the turbines love it ! I believe however the methanol is to stop the water freezing through the compressors and in the inlet when its extreamly cold.