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Helicopters
Lift is Generated by Rotor Blades to Allow a Helicopter to Take Off! The Turning of the Rotor Blades Provides Lift.
Rotating the rotor blades would cause the helicopter fuselage to rotate in the opposite direction, if nothing were done to prevent it doing so. This is because of Newton’s Third Law, which states that every action has an equal and opposite reaction. To prevent this happening, a small rotor is placed sideways on the helicopter’s tail, and this pushes the fuselage back when it starts turning. The yaw pedals control the pitch of the tail rotor blades, and this also gives the pilot a means of turning the helicopter, by varying this pitch angle. Therefore the pedals are used to turn the helicopter on the spot.
It has been said that a helicopter is like a bumble bee – it shouldn’t theoretically be able to fly, but no-one told the bumble bee. But this is not quite true. The same principles of flight as for aeroplanes enable rotary winged aircraft to become airborne. The process is just a little more complicated when the aircraft has rotating wings…
The helicopter engine is therefore started, and this makes the blades rotate. The pilot then needs to alter the pitch of the blades, The angle between them and the airflow. This is done by raising the collective lever on the pilot’s left side. This increases the pitch of all the blades together, causing the required pressure difference, and the helicopter will then lift off the ground into a hover. \
http://aerospaceplanes.suite101.com/article.cfm/how_do_helicopters_fly
In order for an aircraft to fly, its wings need to act as an aerofoil. This means that when air is blown over the wings, the pressure difference between the upper and lower surfaces allow the aircraft to rise into the air.
