want to read about : Controls and instrumentation - Engine thrust
Engine torque
18. Engine
torque is used to indicate the power that is developed by a
turbo-propeller engine, and the indicator is known as a torquemeter.
The engine torque or turning moment is proportional to the horse-power
and is transmitted through the propeller reduction gear.
19. A torquemeter system is shown in fig. 12-4. In this system, the axial thrust produced by the helical gears is opposed by oil pressure acting on a number of pistons; the pressure required to resist the axial thrust is transmitted to the indicator.
20. In addition to providing an indication of engine power; the torquemeter system may also be used to automatically operate the propeller feathering system if the torquemeter oil pressure falls due to a power failure. It is also used, on some installations, to assist in the automatic operation of the water injection system to restore or boost the take-off power at high ambient temperatures or at high altitude airports (Part 17).
Engine torque
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| Fig. 12-4 A simple torquemeter system. |
19. A torquemeter system is shown in fig. 12-4. In this system, the axial thrust produced by the helical gears is opposed by oil pressure acting on a number of pistons; the pressure required to resist the axial thrust is transmitted to the indicator.
20. In addition to providing an indication of engine power; the torquemeter system may also be used to automatically operate the propeller feathering system if the torquemeter oil pressure falls due to a power failure. It is also used, on some installations, to assist in the automatic operation of the water injection system to restore or boost the take-off power at high ambient temperatures or at high altitude airports (Part 17).
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