helicopter components Flashcards
HELICOPTER MAJOR COMPONENTS
AIRFRAME
FUSELAGE
LANDING GEAR
POWERPLANT
TRANSMISSION MAIN
ROTOR SYSTEM
ANTITORQUE SYSTEM
Fundamental structure, of a helicopter can be made of either METAL or WOOD, COMPOSITE MATERIALS, or some combination of the two
AIRFRAME
LANDING GEAR
of helicopters
Skids and wheels
simple and lighter weight, so it is the best choice for small helicopters as weight is always a consideration.
SKIDS
helicopter can ground taxi (as opposed to hover taxi) around other aircraft and people without worrying about producing a high downwash.
WHEELS
The two most common types of engine used in helicopters are the
RECIPROCATING ENGINE
TURBINE ENGINE.
, also called piston engines, are generally used in smaller helicopters.
Reciprocating engines
Are more powerful and are used in a wide variety of helicopters
TURBINE ENGINE
transfers power from the engine to the main rotor, tail rotor, and other accessories during normal flight conditions
transmission system
- reduces engine output rpm to optimum rotor rpm. This reduction is different for the various helicopters.
MAIN ROTOR TRANSMISSION
- also called Tail Rotor Drive Line or Tail Drive Line, runs from the rear cover of the main gearbox to the disconnect coupling at the intermediate gearbox.
TAIL ROTOR DRIVE SYSTEM
- allows the engine to be started and then gradually pick up the load of the rotor.
CLUTCH
- Since lift in a helicopter is provided by rotating airfoils, these airfoils must be free to rotate if the engine fails.
FREEWHEELING UNIT
The rotor consists of a
mast, hub, and rotor blades.
- is a cylindrical metal shaft that extends upwards from and is driven, and sometimes supported, by the transmission
MAST