65.28 Turbine Engine Performance

65.28.2 Define the following terms and describe the relationship between them, and their application to engine operation:

(a) power

Power is the rate at which work is done.

In the context of aircraft engines, power refers to the amount of work that the engine can produce.

(b) thrust

Thrust is the force that propels an aircraft forward.

In the context of aircraft engines, thrust is generated by the engine and is used to overcome the drag on the aircraft.

(c) torque

Torque is the twisting force that is produced by the engine.

In the context of aircraft engines, torque is used to turn the engine's crankshaft.

(d) shaft horsepower (SHP)

SHP is the amount of power that is produced by the engine's crankshaft.

It is calculated by multiplying the engine's torque by its rotational speed.

65.28.4 Describe the effect of the following factors on turbine engine performance:

(a) altitude

Altitude affects the amount of air entering the engine.

As altitude increases, the air becomes less dense, which can lead to a decrease in thrust and power output.

(b) pressure

Pressure affects the amount of air entering the engine.