Questions tagged [helicopter]

A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft would usually not be able to take off or land.

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21
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4answers
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Do helicopters fly a standard pattern before landing?

How do helicopters approach and land at an airport? Do they use the same general traffic pattern as fixed-wing aircraft?
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Why do some helicopters have the tail rotor mounted higher than the tailboom?

Why do some helicopters have the tail rotor mounted high above the tailboom, whereas others have it at the end of the tail boom? Above the tailboom: Wiki Commons At the end of the tailboom: Boeing....
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Do aeroplanes have to balance torque like helicopters?

Helicopters need a tail rotor to balance the torque reaction that tends to rotate the main body sideways. Doesnt a single-engine plane suffer the same problem? I would imagine that (for example) the ...
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1answer
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Why was I getting an uncomfortable feeling in an R22 at 3,000 feet?

I was thinking through my flying experiences when I remembered a strange sensation while I was a student. In a Robinson R22, with about 35 hours experience, I was doing a solo flyout to a nearby ...
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Why aren't modern helicopters quieter?

Living closer to a Sikorsky factory, I can attest that modern civilian (and military) helicopters are quite noisy. In any case, they are considerably louder than light aircraft, turboprops, and even ...
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2answers
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Why do commercial helo pilots wear helmets?

I've been on my fair share of commercial helo rides, primarily in Canada. Over the course of more than ten rides in three different kind of helos (Bell 407, 412, and I think one other) there was only ...
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6answers
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How do helicopters turn using rotor?

I know that airplanes use rudder to turn, and use elevator for nose up and down. How do helicopters change their altitude and how do they make turns?
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1answer
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Is the autorotation in San Andreas movie realistic?

San Andreas is an awful movie, but given how helicopter-centric its plot is I'm wondering if they even got the autorotation landing correct? In the middle of the movie the hero is cruising in (I ...
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What is the definining line between a helicopter and a drone a person can ride in?

When I say drone in this context I don't mean an unmanned aircraft. I'm not sure what the terminology of a drone that has been adapted to carry a person? Is this picture below considered a helicopter ...
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How does a helicopter pilot execute an auto-rotation landing?

What are the critical steps a pilot follows to perform an auto-rotation landing?
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Do helicopter rotor tips regularly go supersonic?

In my question about helicopter noise, I made the assumption that one reason they are so darn noisy is that the main rotor tips go faster than the speed of sound. @FreeMan questioned whether that was ...
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How do helicopters avoid colliding?

When helicopters fly over a city, how do they avoid colliding with each other? For example, after a shooting or accident, both police and news helicopters could head to the same spot.
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Can a helicopter carry a large airplane?

I saw on YouTube a helicopter carrying an airplane. Is this possible, I mean is the maximum load compatible with the mass of this aircraft?
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Why are three-bladed helicopters relatively rare?

I admit that this observation is entirely subjective, but it seems to me that there three-bladed rotors are significantly less popular than two or four. Factors that I'm guessing contribute - ...
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What is the use of Stub Wings on Helicopters?

Some Helicopters like Russian Mi-24, UH-60 etx have Stub Wings. What is the role of such wings? Russian Mi-24 UH-60
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Was there any progress in ramjet-powered helicopters after 1960?

It seems in 1950's some countries investigated production of helicopters powered by ramjet engines on rotor tips - examples include American Hiller YH-32 Hornet or Polish JK-1 Trzmiel. The enthusiasm ...
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4answers
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Do helicopters try to take off and land into the wind?

When helicopters take off and land is it preferable to point the nose into the wind? Since a helicopter is providing its own lift does it matter which direction wind is coming from?
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1answer
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Why is there a plateau in helicopter H/V diagrams?

The "dead-man's curve" in a typical helicopter height/velocity (H/V) diagram is commonly referenced to indicate that "towering flight" is dangerous and avoided in general practice. (Simon explained, "...
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4answers
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How do “tip jet” helicopters cancel the torque effect of the main rotor?

Some helicopters use "tip jet" on the rotor blades tips such as the McDonnell XH-20 Little Henry and Hiller YH-32 Hornet. How do they cancel the rotor torque (often canceled by the tail rotor)?
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In helicopters, why not have electric motors controlling blade pitch?

From my related question comes this idea of electrically controlled blade pitch in helicopters. Control linkages in helicopter rotors seem to be pretty complex. This surely incurs a lot of friction, ...
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3answers
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What happens if Marine One's rotor blades fail?

While I was reading news, I came across this image of Marine One: This is Sikorsky UH-60 Black Hawk Citation of Image 1 Citation of Image 2 On a closer look, I see there are two big exhausts just ...
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How does this RC helicopter keep itself upright?

I have this (cheap, beginner-level) RC helicopter: It has 3 controls: one for climbing and descending (collective throttle), one for yawing (differential throttle), and one for pitching (the tail ...
17
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1answer
316 views

Are helicopters reinforced asymmetrically?

Helicopters are under a constant torque due to the action-and-reaction forces caused by the rotation of the rotor(s). In the tail rotor and tandem rotors configuration, the airframe is experiencing ...
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4answers
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Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aeroplanes)

Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aircr). Would there be a difference between a C172 and a 737?
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What is the loud noise of a helicopter when the rotors are not yet moving?

What is the loud noise when a helicopter is ready to start flying, but the rotor is not yet rotating? For example at Trump's "chopper talk", when he is intercepted by reporters on the way to Marine ...
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How do helicopters avoid detection from enemies by using IR suppressors?

no IR suppressor IR suppressor All I know is that it blends the hot air before releasing it How does an IR suppressor help an aircraft avoid detection from a missile? Wouldn’t the entire ...
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What are the differences between the CH-46 and the CH-47?

The CH-46 and the CH-47 Chinook are very similar-looking aircraft and seem to serve similar purposes - only though for different branches of the U.S. military. What are the differences between the CH-...
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Why can't helicopters fly at high altitudes?

I recently watched a movie and in the movie it stated that the helicopter could not fly to the top of mt.everest to rescue the person stuck on the top. So why can't helicopters fly at such high ...
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Are there any reported cases of noise from helicopters causing damage to property?

In the Netherlands, three cases have been reported of Chinook helicopters' rattle noise (low frequency sound) damaging solar panels. The Dutch defense ministry recognises this problem and the lawyer ...
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Why would helicopters not have black boxes?

Is there a legitimate argument against having a black box on helicopters? I'm assuming there must be reasons beyond financial ones?
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Why is a 0 kt, vertical climb in a helicopter not safe near the ground?

In the "Test Pilot" column in the July 2017 issue of AOPA Pilot, one of the questions was From reader David Franklin: If a given helicopter has a best rate-of-climb airspeed of 60 knots, its ...
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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 ...
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1answer
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Why do helicopters and airplanes use different headset plugs?

If the headsets and microphones for general aviation have the same impedance for helicopters and airplanes, then why do they have different connectors on them? Is it simply to make more money from ...
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Helicopters with landing skids, no wheels; How are they taken in and out of a hangar?

I'm sure many helicopters also need/use Hangars frequently. How do you take them to a hangar and take them out of it without wheels? Specially when they have to be taken indoors for some maintenance ...
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Can a helicopter stall?

Imagine that a helicopter raises its nose up and then there is a loss in speed. Can it enter a stall? If so, how do you recover from the stall?
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Do helicopters have trim? How does it work?

I recall having read somewhere that “helicopter in forward flight behaves just like a badly trimmed airplane”. So I'd like to ask: Do helicopters have trim? If so, how does it work? And is the ...
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How does the MD 900 accomplish auto rotation with the NOTAR system?

The MD-900 is a helicopter which seems to be quite popular with law enforcement agencies. As you can see, instead of an anti-torque tail rotor, a fan exhaust is directed out slots in the tail boom. I ...
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1answer
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How is auto-rotation different in coaxial rotor helicopters?

Coaxial Helicopters have two main rotor sets, one on top of the other, spinning in different directions to eliminate the need for a tail rotor. I've heard it said they're also more maneuverable, all ...
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Why do helicopter operations avoid IFR?

In almost any airplane commercial operation, unless you’re doing something very short haul daytime ops, an Instrument Rating is all but required with airplanes(it’s even in the FARs). Generally the ...
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What type of helicopter is shown in Star Wars The Last Jedi featurette?

There is a nice featurette about the new Star Wars movie The Last Jedi. One shot (1:32) shows a helicopter in the background. What is it?
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Can you fly a helicopter without a driver's license?

Assuming one does not have a driver's license, is it possible for one to obtain a pilot's license to fly a helicopter? Cost is not the question here. I want to know if one can never obtain a driver's ...
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What is the name of the maximum altitude at which a helicopter can fly?

What is the name of the maximum altitude at which a helicopter can fly? I recall it as "vertical limit", but I can't find a Wikipedia page for it other than a movie of the same title, which seems to ...
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What is “settling with power” and how does it differ from vortex ring state?

I've always heard these terms used interchangeably. I figured that "settling with power" was what the pilot did to cause the vortex ring state (VRS). But comments on another question indicate that ...
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1answer
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What are these sensors on the Night Stalkers' Chinook MH-47G?

What are these sensors (or lights) on this heavy assault Chinook MH-47G of the US 160th Special Operations Aviation Regiment, "Night Stalkers"? Source, picture by Russell Hill This regiment was the ...
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What exactly happens when I try to maintain the flare when coming to a hover?

I've been considering this question. I believe myself to be an average pilot but I'm embarrassed to say that I could not figure out the answer to the following question: I flare and use power to ...
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Can rotorcraft pick up a dangerous electric charge?

So, I was re-watching The Hunt For Red October, (in light of current Russian shenanigans with Sweden), and there was a scene in which a crew-member on the ground was electrocuted by making contact (...
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Is an “atmospheric geostationary satellite” feasible with current technology?

Meaning by "atmospheric geostationary satellite" a vehicle capable of hovering 30 km above Earth surface, hence insde atmosphere, for unlimited time, making use of air propellers, solar panels and ...
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Why does the US Marines continue to fly the AH-1 Cobra, retired by the US Army in the late 90s?

My father flew Bell AH-1 Cobra for the United States Army in the late 1970s and a young man in my daughter's USN winging class (July 2017) was being assigned to Camp Pendleton to fly Cobra's for the ...
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What is this helicopter (and probe) in the film “Act of Valor”?

In the film Act of Valor, two helicopters are used to airdrop troops and their boats onto a river. (Clip here.) Firstly can you identify the aircraft? Second, what is the extremely long probe on the ...
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What causes hunting movement in helicopter rotors?

The blade of an helicopter rotor can have three hinges: pitch hinge, flapping hinge and lead-lag hinge. Lead-lag (dragging): movement of a blade forward or aft in the plane rotation. Lead lag is ...

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