DETONATION INDICATING EQUIPMENT for ALLISON ENGINES

WHEN the Allison Division began to work on the detonation problem in 1941, the commercial equipment available was not considered adequate, so a program was initiated to develop equipment for detecting detonation on the Allison liquid-cooled engine.

The equipment described here, the authors conclude, has proved to be successful in determining detonation limits, in acting as a danger signal, and in detecting certain installation troubles. As a routine flight instrument it permits maximum power to be developed with minimum hazard, and under certain conditions permits maximum safe cruising economy. It may also be connected to servomechanisms for automatic control.