Download: Water injection: NACA report from 1942

Report of the National Advisory Committee for Aeronautics (NACA) at Langley Field, August 1942.

This report highlights, curves and downforce tests, the various advantages of fighter jet engines equipped with additional water injection.

The main conclusions are:

  • The injection of water increases the octane number of the mixture.
  • The water injection allows the increase of the effective average pressure with a reduced specific consumption.
  • The injection has a cooling effect of the internal parts of the engine (piston and cylinder).
  • Water injection does not provide fuel economy when fuel is not being used to its thermochemical limits.
  • In extreme conditions, the injected water can dilute with the lubricating oil and cause damage.

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