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Helicopter Structures

 Helicopter Structures

  • Is have unique flight characteristics by the structures are designed, and the helicopter is flying by rotor are rotating airfoils that provide lift, and airfoils faster over the curved upper surface of the rotor is caused negative pressure.
  • For increasing or decrease lift is can possible by a change the angle of attack of the rotating blade is made the helicopter lowering or raising if is flying horizontally is just by tilting the rotor plane of rotation of helicopter.

Airframe:

  • The airframe can be made of wood composite materials or something like that, because consist of many layers of fiber impregnated resin of the structure, the aluminum is used in tubular and sheet metal substructures and in high stress or heat usually use titanium or stainless steel, and always airframe designing aerodynamics materials technology for balancing of performance of flying.

Fuselage:

  • In the fixed-wing aircraft the tail booms and fuselage are often semi-monocoque structures, in the skin aluminum, is used and in the firewalls and engine deck the stainless steel is used in the modern helicopter.
  • Most helicopter fuselage vary from  those with a truss frame, no doors, 2 seats and monocoque shell flight compartment some cabine found on larger twin-engine, the multidirectional nature makes range visibility from the cockpit.

Landing Gear:

  • There is many helicopters have landing gear with wheels, and other have set of tubular metal skids replace the landing gear is just function on the ground.

Power plant: 

  • The reciprocating engine also called a piston engine is used in small helicopters and turbine engine is used in most training because is simple to operate the two types is most used in the engine of helicopters.

Main Rotor System:

  • The first response of creating a lift is defined as rotating the part is consist of rotor blades and hub and mast, the rotor blades is attached to the hub by some methods, and mast is cylindrical metal extends upwards is supported by transmission, the top of the mast is called hub.

Rigid Rotor System:

  • the rotor blades are rigid and  attach to the main rotor hub and are not free to move back (drag) or move up and down (flap) of the helicopter.

Antitorque System:

  • By these devices can counteract the effect of torque that creating by large rotating mass of main rotor blades and this force of torque is increase with engine power and try to spin the fuselage in against the direction of flying.

 

 


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