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An enclosed tail rotor is safer and resistant to fouling.
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∙ 15y ago
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Why do some helicopters have a small tail rotor?
Tail rotors are to correct the effect of engine torque and help steer the helicopter
Which Helicopters have Fenestron tail rotors?
Those are the helicopters designed by Aerospatiale (which was later merged into Eurocopter). IIRC, the first model to use it was the Dauphin.
How do modern helicopters counteract the rotation of the overhead propeller?
Their tail-rotors counter-act the torque (or spinning) effect of the overhead propellors
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 type of engine used in helicopter?
Early helicopters all used piston engines up to the 1960's . Now most helicopters use jets, except for a few small civilian helicopters. The jets are connected to a very strong and complex transmission which turns the main and tail rotors.
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.
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 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
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.
Why do helicopters need tail rotors?
When helicopters main rotors are turning, it is the natural reaction of the fuselage of the helicopter to spin the other way, this is known as torque, a tail rotor spinning counteracts this force by pushing the other way, The rotor pedals change the pitch of the blades on the tail rotor, if the pilot wants to spin left, he compresses the left anti-torque (yaw) pedal, and the blades will alter their pitch to offer less resistance, making the fuselage spin left, if he wants to turn right, then the pilot will press the right pedal,this will make the blades on the tail rotor change pitch to make even more resistance...this overpowers the torque force and makes the helicopter turn right. hope this helps :)
How does the function of the propeller differ in airplanes as opposed to helicopters?
Fixed wing aircraft use propellers for thrust only. A helicopter uses it's rotors for lift, thrust, and directional control. The tail rotor uses blade pitch to control yaw.
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.
