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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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What's parked in Mil Moscow helicopter plant?

This answer has a photo of a Mil Mi-26 that I felt in love with, so I looked in Wikipedia and learned it's the largest production helicopter, second only to Mil V-12 that flew as a prototype. In turn,...
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How much is the fuel consumption rate of BK-117 B2 and C1 helicopters?

I'm Looking for technical specifications and also annual maintenance cost of BK-117 B2 and C1 helicopters. Is there any formal sources for that on the internet? I've looked up everywhere I could ...
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What is the bend in the tip of the blade for on this helicopter?

The newer Blackhawks have this angle added to the end of its rotor blades. What is it for? How does it add or take performance? (verticalmag.com) Side question: Could this be used on airplane ...
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What helicopter has the most rotor blades?

I have seen 2 rotor blades up to many and wonder when does having more rotor blades become less efficient? What helicopter has the most rotor blades? Related: Why don't helicopters prefer shorter ...
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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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Why in helicopter autorotation phase the opposing torque is eliminated?

As you many know, according to Newton's 3rd law for every action there is an equal and opposite reaction, as the main rotor of a helicopter turns in one direction, the fuselage tends to rotate in ...
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How does a circulation control helicopter work

This essay describes that this helicopter uses circulation control of the rotor for cyclic and collective control, but not how circulation control works. https://ntrs.nasa.gov/archive/nasa/casi.ntrs....
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Can I save money on becoming a helicopter pilot in the US if I do flight hours in Mexico?

Flight hours costs approximately $285 per hour. Below is a screenshot from a local (Newport Beach, CA) school regarding what it takes to become a private pilot. So I was hoping that maybe there ...
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Can you help me ID these two helicopters?

Hey folks! Desperate to find what these two helicopters are. Any help greatly appreciated!! A
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Why is the rotor system of an aircraft and the rotor system of a helicopter different? [closed]

Both aircraft with propeller(variable pitch) and helicopter rotor system can change pitch. Of course, for helicopter, there is not only collective pitch control but also cyclic control. The aircraft ...
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Why does the Apache create much more rotor noise than the A-129?

The AH-64 Apache attack helicopter was upgraded several times after its first flight in 1974. The Apache Longbow was a major upgrade which entered service in 2003. On the other hand, Agusta A-129's ...
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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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What happens if full collective pitch is suddenly commanded on most modern helicopters?

Related, but not the same: What happens when you apply full cyclic + collective? If the pilot suddenly applies full collective pitch on a turbine powered helicopter, will the engine stall? It seems ...
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Twin engine helicopters: is the throttle controlled separately for each engine or together?

There is usually a twist throttle on the collective for a single engine helicopter. On twin engine helicopters, does the twist throttle control it for both engines, or just for one?
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What happens when you apply full cyclic + collective?

Can a helicopter apply full cyclic and then full collective at the same time? Would'nt the blades on one side (opposite of the intended tilt direction) have already maxed their aoa, resulting in a net ...
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Do you need 40 hours in a helicopter to get a PPL add-on if you already have an ASEL PPL?

FAR 61.109(c) says: For a helicopter rating. Except as provided in paragraph (k) of this section, a person who applies for a private pilot certificate with rotorcraft category and helicopter class ...
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In what emergency situations would a pilot bail out of a helicopter?

The Hiller UH-12 POH actually mentions “Emergency Exit in Flight” as an emergency procedure. What emergencies would make the pilot do this and why don’t other helicopter POH’s mention this?
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Advance ratio formula for drone propeller in vertical climb

According to this wikipedia article. There are two expressions for advance ratio: For propellers: $$J = {V_\infty \over nD} \tag{1}$$ For helicopters: $$\mu = {V_\infty \over \Omega r} \tag{2}$$ We ...
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Why would a helicopter climb in a spiral?

I was just watching the James May's Toy Stories Christmas Special Flight Club*, and in it he commented that the helicopter was making a spiral climb to 8,000'. Why would the pilot spiral, not just ...
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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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Flying in a helicopter with open doors: why don't people fall out?

This has been puzzling for quite a long time. Every action movie or military documentary features helicopters with no door or with open doors and yet people inside look like they couldn't care less. ...
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Is autorotation possible in a tandem rotored helicopter?

I just wonder, whether a synchronized autorotation is possible in case of turbine failure (one or both gas turbine engines). All Gearboxes obviously must turn not to desynchronize -> lethal
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What are the common private pilot practices for helicopter off-airport landing in US?

These questions address the legal aspects of off-airport landing and basically conclude that the relevant laws and regulations are very fragmented. Aside from the legal aspects, what are common ...
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Has there ever been a diesel-electric helicopter?

Occasionally I come across the diesel-electric (DE) design for submarines and freight trains. They say something like "a diesel engine powering an electric drive lets the two operate at their most ...
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Would increasing rotor disc diameter increase efficiency in a helicopter by reducing disc loading?

Despite the obvious drawbacks of a larger rotor diameter would the reduced disc loading increase efficiency during hover and forward flight?
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What is the minimal landing area required for an EC135 air medical services helicopter?

The Netherlands has a few Eurocopter EC135s for air medical services. (See Wikipedia.) How much clear landing space is required (either theoretically, practically or regulatory) for these?
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Is it possible to design a helicopter with fixed rotor blades only (no blade angle/flap/pitch)?

I am not familiar with helicopter rotor design but I wonder if it is possible to build a working/flying helicopter with fixed rotors that cannot change the blade angle, flap, pitch or adjust blades ...
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Will Thrust on Rotor (Main) increase with altitude?

Can some one please let me know,if the thrust required on the rotor head increases with the increase in altitude in an Helicopter or decreases with increase in Altitude?. Thanks in advance, Pawan
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How far can one be from an helipad when marshalling an helicopter?

I considered 25 meters (as per UN SOP's) but after working years with MI-8's the downwash can flatten a big man. I'm interested in procedures from the FAA etc. ...
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Phoenix Area Helicopter ATC: What is “Hee-lah” (Gila?) One, and what is the 101 transition?

I've been listening to the Phoenix Tower LiveATC feed, and I hear references to "Hee-lah" (Gila?) One and the 101 transition with helicopters (see audio files below): Angel-Five TV-3 TV-15 Does ...
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2answers
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Are helicopter searchlights fixed or movable?

Can the helicopter crew move the helicopter searchlights or are they always fixed at a specific location on the helicopter? They are used by rescue helicopters mostly but I am not sure if crew can ...
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4answers
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Wheel or skid? Which advantages does each one have when used as the landing gear system compared to the other one?

I would like to discuss this topic in depth, as I have not found a clear answer yet. Which are the advantages of using skids instead of wheels (or viceversa) for the following considerations?: -As ...
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Are there attempts at fly-by-wire servo flap controlled rotor?

Reading this question and then this document about servo flap controlled rotor I was wondering if there has been any attempt at building one fixed hub helicopter with twistable blades hosting at 75% ...
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Does the commercial helicopter training in 61.129(c)(3)(i) require a CFII?

For the commercial ticket in a helicopter you need 5 hours of hood time. Can any CFI provide this training or does it require a CFII? 14 CFR 61.129(c)(3)(i): Five hours on the control and ...
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How is static droop achieved in mechanical governors

The Bendix power turbine governor in the Bell 206 is just simple flyweight arrangement which controls a pneumatic signal to the FCU. How is static droop achieved in this type of system?
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When helicopters are instructed to air-taxi direct to an airport location, are they allowed to pass above other aircraft and people?

When helicopters are instructed to air-taxi direct to a location at the airport, are they allowed to pass above other aircraft / people / road traffic?
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Would it be more effective to increase the length or chord of a rotor blade for better performance?

Would it be more effective to increase the length or chord of a helicopter rotor blade for better performance? (Say, 10%?)
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What do I need to get my pilot license? [closed]

I am thinking of getting my pilot license, I would love to fly a helicopter or a small plane, but I don't know where to start. What do I need to get a pilot's license? Things like: How much does it ...
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Do Military Turboshaft engines have a distinctly different sound from Civilian ones?

I live in India, and near an airbase so there are a moderate amount of helicopters flying overhead. My friend claims that he can distinguish between a civilian helicopter or a military one based on ...
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What happens when a helicopter loses an engine?

It seems like at this point it would be game over, since the spinning rotor is the only thing keeping it in the air. Is there any way to land a helicopter in this condition without crashing?
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Does the HAL LCH have fly-by-wire?

Is Automatic Flight Control System (AFCS) the same as Fly-by-wire? If not what's the difference? India’s Hindustan Aeronautics Limited (HAL) has carried out the first flight of a Light Combat ...
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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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Do helicopters have an auto hover system?

I'm not a helicopter pilot. The way I understand it, helicopter pilots have to constantly make small adjustments to make a helicopter hover steadily at a certain point in space, just like fixed wing ...
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Where can I find official information about a recent crash in Mexico?

I have heard about a helicopter crash involving an Agusta A 109 in Mexico, that seems to be causing some turmoil due to the deaths of a newly-elected governor and her husband. Is there any info about ...
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From which rating would it be easier to transition to an Osprey? Fixed-wing or rotary-wing?

If the future of flight was to be on aircraft that were a hybrid of fixed-wing and rotary-wing (for example the Osprey), assuming they had similar technical abilities and the same number of flight ...
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Are there disadvantages of coaxial rotor on attack helicopters?

My question stems from the fact that, although this is a very fierce looking, and formidable aircraft with a very powerful engine, Ka-52 Alligator has not seen many export success. Its export is very ...
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1answer
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How can you calculate the vertical speed of an helicopter during auto-rotation?

How can I calculate velocity of a helicopter when it falls with autorotation when the engine fails, given all the parameters such as mass , height , wing size etc.
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Is there a preferred turn direction for helicopters?

If I have a requirement to fly a helicopter in a circle or racetrack over a point of interest that's stationary or moving relatively slowly, is there any reason to prefer left or right turns? I'm not ...
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Why not simplified fly by wire helicopter controls?

I was discussing helicopter control with relatives over the holidays, particularly regarding how difficult it is to fly one and how changing any control requires adjusting the other two main controls. ...
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Why is the PIC position for helicopters the right seat, rather than the left seat as in airplanes?

So far as I am aware, in a fixed wing aircraft having side-by-side seating and dual controls but only a single set of instruments, those instruments are always positioned in front of the left seat. ...