HI.X.A.S2

From the FAA library

• Helicopter Flying Handbookp. 9-2
  Chapter 9: Basic Flight Maneuvers › The Four Fundamentals › Guidelines

  Good practices to follow during maneuvering flight include: 1. Move the cyclic only as fast as trim, torque, and rotor speed can be maintained. When entering a maneuver and the trim, rotor, or torque reacts quicker than anticipated, pilot limitations ... have been exceeded. If continued, an aircraft limitation will be exceeded. Perform the maneuver with less intensity until all aspects of the machine can be controlled. The pilot must be aware of the sensitivity of the flight controls…

• Helicopter Flying Handbookp. 4-3
  Chapter 4: Helicopter Components, Sections, and Systems › Main Rotor System › Semirigid Rotor System

  same plane as the hub. Whatever stresses are remaining bend the blades for compliance. Helicopters with semirigid rotors are vulnerable to a condition known as mast bumping which can cause the rotor flap stops to shear the mast. The mechanical ... design of the semirigid rotor system dictates downward flapping of the blades must have some physical limit. Mast bumping is the result of excessive rotor flapping. Each rotor system design has a maximum flapping angle. If flapping exceeds the design…

• Pilot's Handbook of Aeronautical Knowledgep. 5-44
  Chapter 5: Aerodynamics of Flight › High Speed Flight › Subsonic Versus Supersonic Flow

  Compressibility (and to a lesser extent viscosity) is of paramount importance at speeds approaching the speed of sound. In these speed ranges, compressibility causes a change in the density of the air around an aircraft. During flight, a wing produces ... lift by accelerating the airflow over the upper surface. This accelerated air can, and does, reach sonic speeds even though the aircraft itself may be flying subsonic. At some extreme AOAs, in some aircraft, the speed of the air over…

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

  Translating Tendency (Drift) During hovering flight, a single main rotor helicopter tends to move in the direction of tail rotor thrust. This lateral (or sideward) movement is called translating tendency. [Figure 2-27] To counteract this tendency, one or more ... following features may be used. All examples are for a counterclockwise rotating main rotor disk. Figure 2-27. A tail rotor is designed to produce thrust in a direction opposite torque. The thrust produced by the tail rotor is sufficient…

• Helicopter Flying Handbookp. 10-5
  Chapter 10: Advanced Flight Maneuvers › Rapid Deceleration or Quick Stop › Technique

  cyclic requires an equally rapid application of down collective. As collective is lowered, apply proper antitorque pedal pressure to maintain heading, and adjust the throttle to maintain rpm. The G loading on the rotor system depends on the pitch ... attitude. If the attitude is too high, the rotor system may stall and cause the helicopter to impact the surface. After attaining the desired speed (position 4), initiate the recovery by lowering the nose and allowing the helicopter to descend…

• Helicopter Flying Handbookp. 2-25
  Chapter 2: Aerodynamics of Flight › Turning Flight

  Figure 2-45. Forces acting on the helicopter during turning flight. Autorotation is the state of flight where the main rotor disk of a helicopter is being turned by the action of air moving up through the rotor rather than ... engine power driving the rotor. In normal, powered flight, air is drawn into the main rotor disk from above and exhausted downward, but during autorotation, air moves up into the rotor disk from below as the helicopter descends. Autorotation…