What are the 3 different regions for autorotation in order?

During vertical autorotation, the rotor disc is divided into three regions—the driven region, the driving region, and the stall region.

What are 5 major parts of airframe of a fixed-wing aircraft?

The airframe of a fixed-wing aircraft consists of five principal units: the fuselage, wings, stabilizers, flight control surfaces, and landing gear. [Figure 1-13] Helicopter airframes consist of the fuselage, main rotor and related gearbox, tail rotor (on helicopters with a single main rotor), and the landing gear.

How does autorotation produce lift?

The rotational speed of the rotor system is held constant, and lift is created by increasing each rotor blade’s angle of attack. This is accomplished by raising the collective pitch control in the cockpit. Basic aerodynamic theory tells us that an increase in lift will be accompanied by an increase in drag.

What is autorotation in fixed wing aircraft?

For fixed-wing aircraft, autorotation is the tendency of an aircraft in or near a stall to roll spontaneously to the right or left, leading to a spin (a state of continuous autorotation).

What is full down autorotation?

What is a “Full Down Autorotation”? A: When a helicopter loses power to turn the main rotors, a helicopter pilot must ensure continued rotation of the rotors to support a controlled descent to the ground by entering an autorotation.

What are the parts of an airframe?

Airframe, basic structure of an airplane or spacecraft excluding its power plant and instrumentation; its principal components thus include the wings, fuselage, tail assembly, and landing gear.

What are the 5 main components of an aircraft?

5 Main Components of an Aircraft

• Fuselage. The fuselage is one of the major aircraft components with its long hollow tube that’s also known as the body of the airplane, which holds the passengers along with cargo.
• Wings.
• Empennage.
• Power Plant.
• Landing Gear.

What is autorotation in fixed-wing aircraft?

What is mandibular autorotation?

Abstract. Mandibular autorotation is a generally accepted cephalometric phenomenon that occurs when surgical superior repositioning of the maxilla is planned. This investigation was undertaken to determine whether autorotation of the mandible is a biologic phenomenon as well.

What happens during autorotation?

Definition. Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor. It is analogous to gliding flight in a fixed-wing aircraft.

What is autorotation in an airplane?

Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor. It is analogous to gliding flight in a fixed-wing aircraft.

What does autorotation mean for a fixed wing aircraft?

For fixed-wing aircraft, autorotation is the tendency of an aircraft in or near a stall to roll spontaneously to the right or left, leading to a spin (a state of continuous autorotation). Contents. Autorotation in fixed-wing aircraft. A typical graph of lift coefficient and drag coefficient versus angle of attack.

What causes an aircraft to roll on its side?

Any disturbance of the angle of attack on one wing will cause the whole wing to roll spontaneously and continuously. When the angle of attack on the wing of an aircraft reaches the stalling angle the aircraft is at risk of autorotation.

What do you need to know about autorotation in a helicopter?

If executed properly, the helicopter will settle into a steady descent rate and rotor speed and the next phase of autorotation begins. Once the pilot obtains a steady descent rate and airspeed, he must look for a safe LZ. Throughout this phase, he must keep the rotor speed in a safe range, typically between 85% and 105% of nominal speed.

What does aft cyclic mean on a helicopter?

If the helicopter is flying with sufficient forward speed, aft cyclic can also be very helpful. This pitches the nose up and allows the high-speed oncoming air to blow up through the rotor. This also powers the rotor like a windmill. This aft cyclic / pitch up is only temporary.