Questions tagged [rotary-wing]

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6
votes
2answers
1k 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
votes
2answers
1k 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
votes
4answers
620 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, ...
7
votes
2answers
639 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
votes
3answers
8k 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
votes
4answers
4k 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
votes
1answer
281 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
votes
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
votes
3answers
18k 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 ...
38
votes
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; ...