Questions tagged [tail-rotor]

The tail rotor is a smaller rotor mounted at the end of a helicopter's tail.

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6
votes
2answers
356 views

How much force does a helicopter's tail rotor counteract?

How much force does a helicopters tail rotor counteract? What are the formulas for determining this? How much rotational torque is produced by spinning the blades?
5
votes
1answer
514 views

How does a Delta-3 hinge on a helicopter tail rotor work?

I am trying to understand how adding offset hinges would provide a self-feathering force. Does anyone have more information on Delta hinges on helicopters? I am a bit confused with the information I ...
27
votes
5answers
8k views

Why is the UH-60 tail rotor canted?

The Sikorsky UH-60 (S-70) has a tail rotor that is canted 20 degrees upwards. Why is that? Picture source
1
vote
1answer
117 views

Does shutting down the engine affect the rate of rotation during autorotation?

If a helicopter's tail rotor shears off while flying then the helicopter's fuselage will start rotating in the direction opposite to the main rotor's rotation direction. During autorotation, if I ...
11
votes
2answers
968 views

What factors govern the placement of a helicopter's tail rotor (left or right)?

An image search for 'helicopter' indicates that there isn't a consensus on whether to place the tail rotor to the left or the right of the tail boom, although I'm believe there may be a bias for left. ...
1
vote
0answers
650 views

Can a helicopter fly without a tail rotor? [duplicate]

Just wondering if a helicopter can fly without a tail rotor?
2
votes
1answer
1k views

Why do No Tail Rotor (NOTAR) helicopters use an enclosed variable pitch fan?

Aerotécnica AC-14 was an early no tail rotor prototype which used the ducted exhaust from the turboshaft to counter the torque of the main rotor. The concept seems simple with few moving parts. It ...
16
votes
3answers
4k views

What are the benefits of a non-orthogonal (scissor) tail-rotor?

Why is the tail-rotor of some helicopters (e.g., Boeing AH-64 Apache) made of non-orthogonal (scissor) blades? What are the aerodynamic benefits (or any other benefits) compared to the orthogonal ...