How does a helicopter turn??

Question:
i heard that a copter turns wit its blades......is it true???and wat for is te rotor at te back?

Answers:

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In forward flight, consider the rotating main rotors to be a "disk." To turn, say to the right, the pilot will move the cyclic control "the stick" to the right which lowers the "disk" to the right side and raises the left side. In effect, it's the same thing as banking an airplane's wings for a turn...the helicopter's fuselage simply follows the main rotor.

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The pedals are used to coordinate the turn by increasing or decreasing the thrust of the tail rotor (anti-torque rotor.) This is done to achieve the same "comfortable" effect in a turn as a rudder does in an airplane. An uncoordinated turn will push the occupants to the opposite side of the cabin of the turn due to centrifugal force.

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Finally, in order to maintain a level altitude during a turn, the pilot will pull up or increase the "collective control"...which is another control stick operated with his left hand. The collective increases and decreases the angle of attack of the main rotor blades...which increases (or decreases when lowered) lift. This is the equivalent of pulling back on the wheel slightly in an airplane during a turn...a little additional lift is needed in a turn to maintain a level altitude.

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At a hover, the anti-torque pedals are used to turn...accompanied by slight increases or decreases made with the collective...depending on which way you're turning.

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At all times during the flight, hover, climb, or descent, the main and tail rotors turn at a constant RPM. They do not speed up or slow down. Speed and rate of climb are a result of the combination of forward cyclic (making the "disk" go down in the front and increasing the collective control (blades' angle of attack.)

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Thrust to the anti-torque rotor is increased or decreased by increasing or decreasing its blades angle of attack...which is done through a linkage to the pedals. The "tail rotor" RPM is constant under all flight conditions...it does not "speed up" or "slow down."

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http://www.helis.com/howflies/tailrot.ph...

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(I'm a 3,000 hour helicopter pilot.)

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i think its the back rotor.....the big one in the middle stays still and the back blows the helicopter to the side so it turns.........

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For rotation about the vertical axis (yaw) the anti-torque system is used. Varying the pitch of the tail rotor alters the sideways thrust produced. Yaw controls are usually operated with anti-torque pedals corresponding to a fixed-wing aircraft's rudder pedals.

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http://en.wikipedia.org/wiki/helicopter#...

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A helicopter turns by altering the pitch (angle) of the blades.

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The back rotor is used to create counterforce so the helicopter doesn't just spin in a circle all the time as it would do without it.

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Helicopters can tilt the main rotor in any direction, which moves the helicopter in its horizontal axis. It also uses the tail rotor to turn the helicopter round on its vertical axis. Used together a helicopter can turn very quickly.

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i think the tail rotor is for turning by increasing or decreasing its speed .the main rotor is for lift and moving forward and backward .lifts if it speeds and lands if it slows.the tail rotor is must for a chopper in order to stabilize the torque produced by the main rotor.

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my dear the helicopter do not turn, it should be how does it run or its blade spin. OK

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The main rotor blades are tilted into the direction the copter needs to go the rotor at the backs only purpose is to stop the tail turning or rotating it is a stopper of rotation. not a rudder.

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You change the pitch of the blades on the tail rotor to control rotational speed.

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helicopter does turn with the blades but only the angle of blades is not enough.
When the rotor blades of the top start rotating it forms a plate which throws air down this throw is used to turn,when it is tilted to left the chopper banks(i.e turns what u think) to left and similarly for right.for moving forward it tilts the plate to front.
Whereas the rotor at the back is to counter the rotational force caused by the main rotor this helps to keep helicopter stable or else if it is not there the helicopters body(fuselage) will rotate to opposite direction .

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The main and tail rotor spin at constant speeds, the tail being much faster. At slow speeds and at a hover, the tail rotor is used for the most part. Increasing the pitch of the tail rotor causes it to create enough thrust to overcome the torque of the main rotor and turn, decreasing the pitch allows the torque of the main rotor to turn it in the opposite direction. The pilot still has to keep it balanced with the cyclic ( main rotor control ). The tail is controlled with the pedals just like on a fixed wing for the rudder. At higher speeds they fly by banking and a little yaw control sort of like an airplane.

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Helicopters turn in two different ways. When it is hovering (no forward movement) it can simply change the pitch of the tail rotor (anti torque) to turn the body of the helicopter on on the main rotors axis. The rudder pedals perform this operation.

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During Fast Forward Flight (FFF) it turns much like a a conventional aircraft by banking using the cyclic (stick). The physics benhind this refute some of the earlier answers. By pushing the cyclic to the side actually changes the pitch on the front and back blades because of gyroscopic procession. The actual force is always 90 degrees offset when the disk is spinning in the green zone (normal operation RPM).

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Check out http://www.howstuffworks.com/helicopter....
for more info and animations.

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yes helicopters maneuver using their rotor blades. the back rotor is for turning left and right by slowing its RPM down it will turn one way and by increasing its rpm it will turn the other way. the main rotor on used for increasing/decreasing lift, tilting the helicopter forward,back,left, and right.

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There is a cam in the collective control system that opens the butterfly in the carburetor (or fuel injection unit) as the collective is raised, and closes it as the collective is lowered. This cam is the primary means of keeping the RPM in its normal operating range during flight. In flight, the throttle is only used to make minor changes to the engine power to maintain the required RPM.

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Individually, the controls are not difficult to understand or use. However, each individual control input effects all other controls. The co-ordination between the controls makes a helicopter more difficult to control than an aeroplane.

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For example, when you raise the collective, the load (and drag) increases with the increase in pitch angle and the cam increases the engine power to maintain the RPM . This increase in engine power causes the nose to turn to the right (torque reaction); at the same time the nose pitches up and rolls to the right, requiring forward cyclic and left cyclic to maintain the required attitude.

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If you push the cyclic forward you tilt the main rotor and create more forward thrust but less vertical thrust, therefore the speed will increase but the helicopter will descend. As the speed builds up, the nose pitches up, rolls to the right and turns to the left. This requires more forward cyclic, some left cyclic and some right pedal. The RPM will increase slightly (rotor efficiency increases as the forward speed of the helicopter increases) requiring a decrease in throttle setting.

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This requires co-ordinated control movements to achieve a smooth flight.

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it's by changing the pitch or angle of the blades
the back blades are used to prevent it from completely spinning out of control