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Now on to water injection. In WW2 Pop was a B17 pilot. The engines in the B17 had a "war emergency power" setting with water injection. Turbocharged radials with pilot controllable wastegates. The war emergency power setting was just what it stated, additional power by overboosting the engines, something like 35 PSI of boost, and the water injection was there.
TO KEEP THE ENGINE FROM BLOWING IT'S CYLINDER HEADS OFF.
Nothing to do with fuel economy, but it did help you to clear the cliffs of Dover in a shot to hades plane with one engine left out of 4 and 50 feet of altitude, trying to save 4 crewmembers who were severely wounded.
regards
Mech
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