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Reciprocating Engines
These types of engines are widely used on smaller types of helicopters.
Fenestron
This system uses a series of rotating blades shrouded within a vertical tail.
Belt drive clutch
It consists of a lower pulley attached to the engine, an upper pulley attached to the transmission input shaft.
Tail rotor
It is a smaller rotor mounted vertically or near vertically on the tail of a traditional single-rotor helicopter.
Clutch system
It allows the engine to be started and then gradually pick up the load of the rotor.
Turbine engines
These engines are more powerful and are used in a wide variety of helicopters.
Main Rotor Transmission
It is to reduce engine output rpm to optimum rotor rpm.
Dual Needle Tachometer
It is used to show both engine and rotor rpm or a percentage of engine and rotor rpm.
Fenestron
It is the common term used to describe the fan-in-tail rotor.
Tail rotor
It is used to eliminate torque produced by the main rotor system.
Note 
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