Helicopters Essay

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Question 1 – how the turning rotor makes a helicopter move upwards Source 1 Essentially, helicopters stay up for the same reason airplanes move forward through the air. A rotating propeller creates changes in air pressure, lowering it in some areas and raising it in others. Combined with a specially curved wing, the effect is known as lift, and its what pulls an airplane forward or allows helicopters to lift off the ground vertically. Without some sort of rotary propeller system, neither aircraft would ever leave the ground. There are two basic types of aircraft, fixed-wing and rotary-wing. A traditional airplane would be considered a fixed-wing aircraft, because the wings are in a rigid position behind or over the propellers. Helicopters, on the other hand, are rotary-wing aircraft, because the wing-shaped rotor blades spin in a circle above the aircraft's body. The individual blades of a helicopter's rotor are adjustable during flight, while a fixed-wing aircraft's wings have very few moving parts. The reason why helicopters stay up in the air is because the individual rotary blades are shaped like airplane wings. Once the spinning rotor assembly has reached a certain speed, the curved blades chop up the air around them, creating lower pressure above the blade and higher pressure below. This action creates a pushing or lifting force from below. The pilot uses hand and foot controls to change the angle of attack on each blade as they spin. This angle affects whether the helicopter will rise, descend, turn, or even hover. Source 2- A helicopter has one or more motor-driven rotors instead of fixed wings. It can take off and land vertically, move in any direction on a lateral plane, or hover in one place. The lift developed by a fixed-wing aircraft's wing depends on two things: the angle of attack of the wing and the velocity of the air in relation to the

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