HI.II.D.K7

From the FAA library

• Helicopter Flying Handbookp. 2-15
  Chapter 2: Aerodynamics of Flight › Hovering Flight › Pendular Action

  This pendular action can be exaggerated by overcontrolling; therefore, control movements should be smooth and not exaggerated. [Figure 2-28] The horizontal stabilizer helps to level the helicopter in forward flight. However, in rearward flight, the horizontal stabilizer can press ... much like a pendulum. It is important to note that there is a difference in the amount of pendular action between a semirigid system and a fully articulated system. Because of the hard connection (offset) of the latter, the centrifugal…

• Helicopter Flying Handbookp. 2-15
  Chapter 2: Aerodynamics of Flight › Hovering Flight › Translating Tendency (Drift)

  risk of objects coming in contact with the blades, but at the cost of increased weight and complexity. Pendular Action Since the fuselage of the helicopter, with a single main rotor, is suspended from a single point and has considerable ... mass, it is free to oscillate either longitudinally or laterally in the same way as a pendulum. This pendular action can be exaggerated by overcontrolling; therefore, control movements should be smooth and not exaggerated. [Figure…

• Helicopter Flying Handbookp. G-4
  Glossary

  superimposed over each other, as on the engine/rotor tachometer. Mast. The component that supports the main rotor. Mast bumping. Action of the rotor head striking the mast, occurring on underslung rotors only. Navigational aid (NAVAID). Any visual or electronic device ... form or shape of helicopter parts. Payload. The term used for the combined weight of passengers, baggage, and cargo. Pendular action. The lateral or longitudinal oscillation of the fuselage due to its suspension from the rotor system. Pitch angle…