Page 155 - The Jet Engine

Controls and instrumentation

relative position as the corresponding, blade of the propeller engine. On multi-spool engines, only one
propeller on the master engine. This again is auto- spool is synchronized. Manual trimming of engine or
matically achieved by very fine trimming of engine shaft speed can be done with the assistance of a
speeds resulting from phase signals from the syn- synchroscope. This visually indicates, in comparison
chrophasing generators. with a master engine, if the other engines are running
at exactly the same speed; the normal engine speed
61. On turbo-jet engines, synchronization can be indicator is, of course, not sufficiently sensitive to use
achieved in a similar manner to that used for a turbo- for synchronizing.

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