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Extra info for Basic Aerodynamics AL0966

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The blade area outboard of the 70 percent circle is known as the propeller or driven region. 13 shows that the aerodynamic force inclines slightly behind the rotating axis. This inclination causes a small drag force that tends to slow the tip portion of the blade. Rotor rpm stabilizes, or achieves equilibrium, when autorotative force and antiautorotative force are equal. The blade area inboard of the 25 percent circle is known as the stall region because it operates above its maximum angle of attack.

To recover from settling with power, reduce collective pitch, lower the helicopter's nose into the wind, and, as airspeed increases, start a slow right turn. 11. PENDULAR ACTION In general, the fuselage of the helicopter is suspended from a single point and has considerable mass. Because of this it has some freedom to move laterally or longitudinally, a pendular action. However, correct aviator cyclic control movements, free of overcontrol, cause the rotor tip path and the fuselage to move in unison.

The airspeed of the retreating blade slows down as forward airspeed is increased. 8B. As the airspeed of the retreating blade is decreased with forward airspeed, the blade angle of attack must be increased to equalize lift throughout the rotor disc area. 8C. 8. Retreating Blade Stall. 26 Upon entry into blade stall, the first effect is generally a noticeable vibration of the helicopter. This vibration is followed by the helicopter's nose lifting and a rolling tendency. If the cyclic stick is held forward and the collective pitch is not reduced, or is raised, the stall becomes aggravated, and the vibration increases greatly.

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Basic Aerodynamics AL0966


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