Aircraft tachometer indicator - an analysis of design factors affecting starting performance

FIFTY years of powered flight have brought changes to aircraft controls. A pilot cannot properly control the flight of today's powerful machines without the use of instruments. Many of the newer instruments and control devices embody electronic elements for sensitivity and speed of response. Some have servo-system operation for highest accuracy. One of the oldest instruments, the engine speed indicator,1 still has an important place on the aircraft instrument panel. Without electronic components or servo elements the simple dragmagnet - eddy-current disk type of tachometer instrument continues to provide a highly accurate and dependable service to the pilot.