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Because without a tail rotor the body of the helicopter would spin the opposite way of the main rotor so the tail rotor is perpendicular to prevent that : Way it works is the tail rotor spins at the same speed as the main rotor to over power the body's need to spin by giving just the right amount of need to go the other way : Hope I Helped , jd703
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∙ 14y ago
Wiki User
∙ 9y agoto help it move left and right
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Is there any helicopter without tail?
No, that is impossible. You see, helicopters must have that tail rotor in order to keep steady. Without one, it would spin out of control in the opposite direction that the main rotor is going. The tail rotor provides a counter form of propulsion that keeps the fuselage (body) of the copter from spinning out of control. The pilot also controls the speed and angle of the tail rotor, so as to turn the helicopter by speeding up or slowing it down. As for Chinooks, those big military helicopters with two main rotors, each rotor spins in the opposite direction to stop from entering a tailspin.
How does a helicopters rotor blades make the helicopter turn left and right?
By adjusting the speed of tail rotor, which points to the side, the pilot can turn the helicopter in flight. The main upper rotor actually plays only a minor part in making helicopter turn. The part supplying most of the control is the tail rotor. Because the main rotor is spinning in one direction, without a tail rotor, the body of the helicopter would spin around in circles in the opposite direction. The reason for this is explained in the first part of Newton's third law of motion: for every action there is an equal and opposite action. The torque generated to make the rotor turn also exerts torque on the body of the helicopter "willing" it to spin the opposite direction. However, the tail rotor spins, pushing air to the side. This creates force in the opposite direction, keeping the helicopter stable. By simply adjusting the speed of the tail rotor, the helicopter can be turned in flight.
Why do some helicopters have different numbers of blades?
If you mean rotor blades, theoretically, only one (provided it is counterbalanced and moves fast enough). But you'll typically see two or more. Helicopters use more than one because it requires less rotor speed to get the same lift, and it also runs a lower risk of failure in the mechanical systems. Many rotocraft use four or five, and some up to six or seven blades. There are a few helicopters that use two main rotors, and they are counter rotating so that their torque cancels and a tail rotor is not necessary. But the mechanical complexity of these main rotor systems impinges on mechanical reliability.
Accuracy of a lathe depends mainly on?
The accuracy of a lathe depends on the following:Skill of the machinistWear on the slides and carriagesAlignment of both head and tail stockWear on the main spindle assemblyWear of the tail stock and in some cases the centerTypes and accuracy of the measuring tools used
How do you use the word fuselage in a sentence?
The "fuselage" is the main part of an aircraft, to which the wings and tail are attached. So, for example, you might write: "The fuselage of the jet was painted bright blue."
Why does helicopter does not rotary about it axis?
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 direction does a helicopter's rotors spin?
Depending on the make of the helicopter, some will rotate clockwise and others will rotate counter-clockwise. However, the main rotor and tail rotor will spin opposite of each other. If the tail rotor spins clockwise, the main rotor will spin counter-clockwise. The main rotor also spins for lift, the tail rotor for control.
Are main rotor and small rotor on helicoper touching and so have to be synchronized during flight to not collide?
AnswerNo. They can't be touching and moving at the same time.The typical helicopter has a Main Rotor and a Tail Rotor that turn at different RPMs. The Main Rotor usually has to turn much slower due to its radius and mass. Typical speed is approximately 300 rpm. The Tail Rotor turns faster as it is smaller; typically 2000rpm. The rotors are separated enough that they do not mesh together and do not require to by synchronized.The Boeing CH-47 has two Main Rotors and no tail rotor. The Main Rotors are synchronized and are designed to inter-mesh during rotation.Typical helicopers are synchronized in the sense that they are driven off of the same transmission. So as the engine turns at a high RPM, the transmission and gearboxes transmit a proportional displacement to the Main Rotor and a proportional displacement to the Tail Rotor.
The rotor blade on the side of the helicopter that moving in the opposite direction?
The tail rotor is moving "perpendicular" to the main rotor, not "opposite". The tail rotor creates thrust opposite to the thrust of the main rotor, to keep the fuselage from spinning. Most helicopters spin the main rotor counter-clockwise looking from above, which puts a clockwise rotation on the fuselage. You need a tail rotor pushing the tail counter-clockwise to keep the fuselage pointed in the direction the pilot chooses.
How many wings does a helicopter have?
Helicopters do not have any wings. Airplanes have wings Helicopter has rotors. A helicopter has at least two sets of rotors. One rotor creates lift ( Main Rotor on the top ) & the other prevents the helicopter from spinning in circles( Tail Rotor).
Why do some helicopters have enclosed tail rotors?
An enclosed tail rotor is safer and resistant to fouling.
What is a helicopter blade called?
the blade is called rotor bladesThe rotor blades on top are called Main Rotor Blades, because they are the main source of lift for the helicopter. The smaller rotor blades on the tail are called Tail Rotor Blades.
What are something that cancels torque in a helicopter?
tail rotor compensates for torque when you lose tail rotor they go into auto rotation mode/ thcopter spins with rotors ouch
Why do some helicopters have a small tail rotor?
Tail rotors are to correct the effect of engine torque and help steer the helicopter
Why doesnt a helicopter Spin out of control?
Most helicopters have a tail rotor for stability while others (often Russian military helicopters) have two main rotors. In both cases the two rotors spin in opposite directions, in order to cancel out any torque effect of a single rotor.
What is the name of the helicopter with two propellers used to carry supplies?
Undetermined. All helicopters have 2 rotors; usually a Main Rotor and a Tail Rotor. So, I assume you meant 2 Main Rotors of same diameter.Boeing Ch-47 Chinook - One rotor mounted in the front over the cockpit and one rotor in the rear.V-22 Osprey - Both rotors are mounted on engine pods mounted at the tips of the wings. The engines rotate from helicopter mode to airplane mode. This helicopter just went into operational service after years of development.There are helicopters with no tail rotor. It has two rotors on top. One going clockwise the other going counter clockwise. Called Coaxial rotors or co-rotors are a pair of helicopter rotors mounted one above the other on concentric shafts. The military ones look like jets so even with jet engines. Very nasty looking helicopters.They are much faster and can turn and maneuver much faster. You can look it up. Helicopters with Coaxial rotors. I do not mean the ones with the fan in the tail. These just have wings on the tail.The other one is the NOTAR is the name of a helicopter anti-torque system which replaces the use of a tail rotor. Developed by McDonnell Douglas Helicopter Systems (through their acquisition of Hughes Helicopters), the name is an acronym derived from the phrase no tail rotor but uses air to keep the copter from spinning.
Why do the CH-47 Chinook helicopters have counter rotating rotor blades?
Most helicopters have a tail boom and tail rotor. This tail rotor is present to counteract the torque produced by a helicopters main rotor. If there was no tail rotor, the helicopter would tend to rotate in a direction opposite to that which the main rotor blade spins which would make flying difficult or even impossible. The Chinook doesn't have a tail rotor, instead it has twin main rotors. If they both span in the same direction then this would act to cause the helicopter to twist. However as they rotate in opposite directions the two twisting forces cancel each other out. This has other advantages as it means that the full power of the engines goes towards generating lift and thrust as opposed to driving the vertical stabilising rotor on other helicopters.
