This video shows how a helicopter drive system transfers power from the high speed output of a gas turbine engine to a helicopter's rotors

00:00 Intro
01:15 Engines
02:10 High Speed Shafts
02:36 Freewheeling Units
03:32 Combining Gear
03:52 Bevel Gear
04:37 Planetary Gear
05:26 Tail Rotor Gears
06:05 Tail Rotor Drive Shaft
06:24 Intermediate Gears
06:48 Tail Rotor Gears

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