Tests have been carried out in order to determine the effect of water injection on the operation of a full-scale aircraft engine. A Jaguar Mk IV supercharged aircraft engine was used and quantities of water as great as 83 lb. per 100 lb. of fuel were injected. As would be expected, the use of water permitted large gains in power without increase in cylinder temperature and apparent detonation. An increase of approximately 90 b.hp. was obtained. Quite appreciable cooling of the air-fuel charge was noted. The specific fuel consumption remained the same or slightly better with injection. From the results it would appear that alcohol does not improve the operation of the engine appreciably, although tests were conducted only at full rich mixtures.
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