# Questions tagged [rotary-wing]

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### Could floppy rotor blades be usable?

Autogyro and helicopter blades are more or less flexible, and when not stiffened by centrifugal force they droop noticeably. A extreme case would be that of fabric blades. They have been used at least ...
• 10.8k
2k views

### Why do helicopters experience a brief dip in altitude during IGE marginal power takeoffs?

The scenario is this: A helicopter is hovering IGE, and executes a marginal power takeoff. What causes the dip in altitude that occurs around 10 knots during the takeoff? Most pilots seem to describe ...
344 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 ...
125 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 ...
• 10.8k
1 vote
137 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 ...
1 vote
110 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 ...
• 10.8k
434 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 ...
• 31
4k 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 ...
• 3,559
3k views

### Do coaxial rotors provide twice the amount of lift?

Do coaxial rotors provide twice the amount of lift given same diameter and RPM?
• 177
894 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, ...
• 223
1k 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 ...
• 339
12k 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 ...
• 2,274
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 ...
351 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 ...
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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? ...
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28k 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?
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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 ...
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