An electro-hydraulic speed and load division control for constant-speed air-turbine drives

This paper presents a description and analysis of an electro-hydraulic speed and load division control for an aircraft constant-speed air-turbine drive for a 400-cps (cycles per second) 60-kva alternator. The development program was undertaken as a product improvement effort over an existing mechanical speed control system. At this writing the development program has been completed and the system is undergoing flight and qualification testing. Representative performance data, in the form of test results, are presented.