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Chapter 9
 

Chapter 9

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Helicopter tail rotors and tail rotor drive systems.

Helicopter tail rotors and tail rotor drive systems.

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    Chapter 9 Chapter 9 Presentation Transcript

    • Chapter 9
      Tail Rotors
    • Tail rotors are required for single main rotor helicopters
      To eliminate tail rotors there are 4 other main rotor configuration
      Coaxial
      Tandem
      Side by side
      Intermeshing
      These systems are much more complex
      Single main & tail rotor system is the best compromise.
      Tail rotor must have pitch change, and flap axis
      Positive and negative pitch
      Controlled by foot pedals
    • Operation
    • Other Configurations
      Intermeshing
      Fenestron
      or
      Ducted Fan
      N
      O
      T
      A
      R
    • Other Configurations
      Tandem
      Co-axial
      Side by side
    • Other Configurations
      Ramjet
    • Must be driven by transmission – always driven
      Due to tail boom flexibility T/R shaft must be able to move in and out
      Hanger bearings are used to support shaft and provide alignment
      Alignment is important for reducing vibration
      It may be necessary to divert T/R D/S if T/R is mounted on top of vertical stab.
      An IGB would be used in this case
      IGB changes direction but not speed.
    • Tail Rotor Driveshaft
    • TGB – change direction and speed
      Bell 47 extension tube
      Universal at one end
      Splined for TGB at other end
      Attaches and supports TGB
      One piece aluminium alloy
    • Tail Rotor Gearbox
    • Tail Rotor Gearbox
    • Tail Rotor Gearbox
    • Tail Rotor
    • Tail Rotor Hub
    • Tail Rotor Controls
    • Tail Rotor Driveshaft
    • Dampener
    • TGB
    • TGB
    • Tail Rotor
    • Tail Rotor Control
    • Tail Rotor Driveshaft
    • Tail Rotor Driveshaft Couplings
    • AS 350
    • Pitch change ring
      Perform during no wind conditions