want to read about : Controls and instrumentation Electronic indicating systems
SYNCHRONIZING AND SYNCHROPHASING
58. Synchronizing and synchrophasing systems are sometimes used on turbo-propeller engined aircraft to achieve a reduction of noise during flight.
59. On a multi-engined aircraft, a synchronizing system ensures the propeller speeds are all the same. This is achieved by an electrical system that compares speed signals from engine-mounted generators. Out-of-balance signals, using one engine as a master signal, are automatically corrected by electrically trimming the engine speeds until all signals are equal.
60. A synchrophasing system ensures that any given blade of an engine propeller is in the same relative position as the corresponding, blade of the propeller on the master engine. This again is auto- matically achieved by very fine trimming of engine speeds resulting from phase signals from the syn- chrophasing generators.
61. On turbo-jet engines, synchronization can be achieved in a similar manner to that used for a turbo- propeller engine. On multi-spool engines, only one spool is synchronized. Manual trimming of engine or shaft speed can be done with the assistance of a synchroscope. This visually indicates, in comparison with a master engine, if the other engines are running at exactly the same speed; the normal engine speed indicator is, of course, not sufficiently sensitive to use for synchronizing.
SYNCHRONIZING AND SYNCHROPHASING
58. Synchronizing and synchrophasing systems are sometimes used on turbo-propeller engined aircraft to achieve a reduction of noise during flight.
59. On a multi-engined aircraft, a synchronizing system ensures the propeller speeds are all the same. This is achieved by an electrical system that compares speed signals from engine-mounted generators. Out-of-balance signals, using one engine as a master signal, are automatically corrected by electrically trimming the engine speeds until all signals are equal.
60. A synchrophasing system ensures that any given blade of an engine propeller is in the same relative position as the corresponding, blade of the propeller on the master engine. This again is auto- matically achieved by very fine trimming of engine speeds resulting from phase signals from the syn- chrophasing generators.
61. On turbo-jet engines, synchronization can be achieved in a similar manner to that used for a turbo- propeller engine. On multi-spool engines, only one spool is synchronized. Manual trimming of engine or shaft speed can be done with the assistance of a synchroscope. This visually indicates, in comparison with a master engine, if the other engines are running at exactly the same speed; the normal engine speed indicator is, of course, not sufficiently sensitive to use for synchronizing.
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