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In Pop's B17 they had a water alcohol injection that was used for "War Emergency Power".
Basically you were running something like 30 pounds of boost, whcih gave the engine a life expectancy measured in minutes.
Without the water-alcohol mix injected into the engine the cylinder heads would have blown off the air cooled radials, not really what you wnated to happen low and slow trying to get off the ground with several tons of explosives aboard.
regards
Mech
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