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Virtually all modern helicopters have a tail rotor which pulls against the torque that comes from the main rotor. This tail rotor also provides additional directional control assistance to the rudder.
Most tail rotors turn at a 3:1 or 6:1 ratio to the main rotor. Meaning, for every revolution of the main rotor, the tail rotor makes 3 revolutions.
You can read more about tail rotors here:
http://en.wikipedia.org/wiki/Tail_rotor
http://www.cybercom.net/~copters/mech/tail_rotors.html
What else can I help you with?
Is a helicopter an airplane?
Yes, a helicopter is known as a 'rotary wing aircraft'
Does a helicopter have a rotary engine?
No, rotary engines went out of use in aircraft in WW1.
Which of these areas of technology best classifies the helicopter?
Rotary-Lift Aircraft
How dangerous are remote control helicopters rotary blades?
Remote control helicopter rotary blades can be fairly dangerous if the helicopter is flying around a person's face. They are often times made of metal, and can damage one's eyes very easily.
What are the advantages and disadvantages of a helicopter?
Can move in any axis
What way does rotary motion move?
Rotary motion moves in a circular path around an axis. The object rotates about a fixed point, spinning on its axis. This type of motion is commonly seen in objects like wheels, propellers, and turbines.
What is a rotary aircraft?
A rotory aircraft is essentially a helicopter or a type of aircraft that relies on the movement of its wing to produce lift.
In what way does the take off of a helicopter differ from that of an aeroplane?
While airplanes need to be in motion with enough momentum to create enough airspeed for lift off, helicopters can lift off vertically without any momentum of the aircraft. Both aircrafts need a rotary wing. Helicopter wings are rotary and have the capabilities to change the angle or pitch in order to create more or less lift. Airplanes have rotary and fixed wings.
What is the science behind a helicopter?
In avionics, a helicopter is known as a Rotary Wing Aircraft. (As distinct from a fixed wing aircraft. ) This indicates the operating principle is based on the ordinary wing profiles used to generate lift.
Is an example of rotary motion?
The rotational motion of an object on a fixed axis. IE - A Wheel on a car. Theoretically speaking, there is no such thing as rotational force. The molecules are trying to move in a strait line, but are being pulled back by the axis bond.
What is the rotary effect of the force called when a force causes a structure to rotate?
The rotary effect of a force causing a structure to rotate is called torque. Torque is the measure of the force causing the object to rotate around an axis. It is influenced by both the magnitude of the force and the distance from the axis of rotation.
Can you give me a brief description about the helicopter?
helicopters fly and have big wirly things on their heads and look like birds The helicopter is an aircraft using rotary wings to give lift and a tail rotor or counter-rotating wings to give stability.
