Test to determine minimum fuel head to operate Liberty "12" engine on propeller load (power plant section report)
DescriptionThis test was conducted to determine the minimum fuel head at the carburetor, required for normal operation on propeller load of a Liberty "12" aviation engine fitted with Zenith U. S. 52 carburetors. The minimum fuel head required varies from 1/2 inch of fuel at extreme idle to 16 inches at full throttle, 1,700 revolutions per minute, for carburetors which give a mixture sufficiently rich to produce smooth operation over the entire range of speeds. If the carburetors give a lean enough mixture at any speed to produce rough operation of the engine, the head required at that speed may exceed that at full throttle.
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