Questions tagged [rotary-wing]

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2answers
85 views

Normal tendency of helicopter with counter clockwise rotating main rotors (top view) with force trim off and leaving controls?

Is it normal for the helicopter with CCW rotating main rotors to pitch down and roll left in forward flight, when force trim is turned off and hands off the cyclic? Moreover, when we put the ...
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0answers
57 views

To which side did the first Cierva autogyros fall?

The first Cierva autogyros, before the introduction of the flapping articulation, fell to the right when the take-off was attempted, according to witnesses. That had an explanation, as the rotor ...
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2answers
79 views

Clarification on autogyro thrust formula

I'm slightly confused regarding the formula quoted here: How to calculate the amount of thrust of a autogyro during auto rotation? When they say thrust is equal to the weight. Do they mean use earth ...
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0answers
37 views

In a gyroplane, how can the angle of attack of the rotor disk be calculated?

In a gyroplane, how can the angle of attack of the rotor disk be calculated as a function of the relevant variables? Those 'relevant variables' are the rotor's angular velocity, the aircraft's ...
3
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2answers
281 views

When starting a turbine helicopter, why should one slowly increase RPM (throttle)?

After the ignition switch is turned ON, my Captain always increases the RPM (throttle) very slowly. I don't know why, because our helicopter has an ECU. One day, my Captain asked me "Do you know why ...
6
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2answers
2k views

Is there a minimum start altitude for autorotation landings?

If a helicopter is flying relatively low, say for sightseeing, can it still land using autorotation if required? What about if there was an issue during a routine landing? Is there any cutoff point ...
3
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2answers
2k views

Do coaxial rotors provide twice the amount of lift?

Do coaxial rotors provide twice the amount of lift given same diameter and RPM?
7
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4answers
741 views

Is a fixed wing more efficient in reaching a certain altitude than rotary wing?

Given the limited amount of energy (battery or fuel) let's reach the maximum possible altitude! Rotary wing aircraft pushes the air directly downwards and propels itself straight up. Fixed wing, ...
8
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2answers
881 views

How much could human power add to the endurance of an electric gyrocopter?

If we take a single seater electric gyrocopter like this one, could a human-powered propeller like this add to the endurance of the aircraft? The gyrocopter only needs a 32km/h forward speed to stay ...
7
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3answers
10k views

Why don't helicopters prefer shorter rotors with more blades? [duplicate]

My understanding of helicopters is that, despite theoretically increasing efficiency, longer blades are worse in practice than short ones in every respect (except, perhaps, cost): Longer blades are ...
8
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4answers
6k views

Is it harder to learn to fly rotary wing after learning on fixed?

I have a private license for single engine land and I want to transition to helicopters. I have been told by some that learning helicopters is more of a challenge after learning fixed wing. However I ...
3
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1answer
316 views

Are the implications of weight and balance for rotary wing aircraft similar to fixed wing aircraft?

Original discussion here. How does weight and balance for rotary wing aircraft work? Is lateral CG more or less of an issue, or is it comparable to fore/aft CG since the lifting surface is rotating ...
7
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2answers
2k views

Why are rotary wing aircraft less efficient than fixed wing aircraft?

This question showed that rotary wing is less efficient than fixed wing, but the answers don't really address why. Why are rotary wing aircraft less efficient than their fixed-wing counterparts? ...
10
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3answers
22k views

How does the efficiency of a fixed wing compare to a rotary wing?

Is fixed wing more efficient than rotary wing? If yes, why is that?
14
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6answers
4k views

Is a propeller a wing?

An aviation expert claimed to me that a propeller is a wing. While I understand that propellers use similar principles to generate force, it muddied the definition of a rotary wing aircraft vs a ...
39
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4answers
4k views

Is a rotary wing craft capable of supersonic flight?

Just what the title states. Since the Wright brothers, aviation technology for fixed-wing craft has advanced by an order or more. Rotary wing craft on the other hand (I know little about aviation; ...