The theory of governing for aircraft turbo alternators Available to Purchase

CONSTANT frequency 400Hz 3 phase, aircraft main electrical power is mostly obtained by employing a main engine driven constant speed drive (C.S.D.) of cither the pneumo or hydromechanical type. The latter, in the form of the Sundstrand (USA) pattern, is the most used and over the years has been improved so that it is at present a very reliable unit. It is, however, very costly to buy and maintain and the quality of the governing it gives is not outstanding.