Intro to helicopters translift


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Intro to helicopters translift

  1. 1. INTRODUCTION A helicopter is an aircraft that is lifted and propelled by one or more horizontal rotors, consisting of two or more blades. It is classified as a rotorcraft or rotary-wing aircraft The word “helicopter” is from the French word hélicoptère It links the Greek words helix/helikos (spiral or turning) and pteron (wing) Helicopter Flying Handbook 2012
  2. 2. ROTOR SYSTEM The rotor system is the rotating part of the helicopter that generate lift May be mounted horizontally, as the main rotor, providing lift vertically May be mounted vertically, tail rotor, to lift horizontally as thrust to counteract torque effect Helicopter Flying Handbook 2012
  3. 3. ROTOR SYSTEM There is more than one type of rotor system along with the number of rotor blades One type of rotor is the tandem rotor helicopter • An example of this is a Chinook Another type of rotor is the intermeshing rotor helicopter • An example of this is a Kaman Our studies here involve the single rotor helicopter • An example of this is a Robinson
  4. 4. MAIN ROTOR SYSTEM Consists of a mast, hub, and rotor blades. Mast- hollow cylindrical metal shaft that extends upwards Hub- at the top of the mast is the attachment point for the rotor blades Rotor blades- attached to the hub. There are 3 different type of classifications Semirigid Rigid Fully articulated Helicopter Flying Handbook 2012
  5. 5. TAIL ROTOR Is a smaller rotor mounted vertically or near-vertically on the tail It pushed or pulls against the tail to counteract the torque Helicopter Flying Handbook 2012
  6. 6. CONTROLLING FLIGHT Four flight control inputs  Cyclic  Collective  Antitorque pedals  Throttle Cyclic- typically located between the pilots legs and is called the “cyclic stick” or “cyclic”. The Cyclic varies the pitch of the rotor blades throughout each revolution. Tilting the cyclic in a direction moves the helicopter in that direction. Pushing the cyclic to one side the rotor disk tilts in that direction and the helicopter moves in that direction. Helicopter Flying Handbook 2012
  7. 7. CONTROLLING FLIGHT Collective- collective pitch or Collective is located on the left side on the pilot. The collective changes the pitch angle of the main rotor blades. Collective input allows all blades to change equally (collectively) increasing or decreasing lift or thrust. This results in the helicopter increasing or decreasing in altitude or airspeed. Helicopter Flying Handbook 2012
  8. 8. CONTROLLING FLIGHT Antitorque pedals- located in front of the pilots feet. The pedals control the direction of the nose. The pedals change the pitch of the tail rotor blades, increasing or reducing thrust by the tail rotor causing the nose to yaw in the direction of the applied pedal. They are to counteract torque or lack there of from the engine. Helicopter Flying Handbook 2012
  9. 9. CONTROLLING FLIGHT Throttle- this controls the power produced by the engine. This is located as a twist grip on the end of the collective control. The throttle adjusts for engine power to keep the rotor rpm maintainable and within allowable limits when the engine is providing the necessary power. Helicopter Flying Handbook 2012