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.

Filter by
Sorted by
Tagged with
0 votes
1 answer
39 views

How to find accurate civil aviation flight traffic data? [closed]

I need to review civil aviation flight traffic data for several regions around the world. My preference is real-time data, but data delayed by 5-15 minutes is fine. Historical data (going back 1 year)...
user avatar
3 votes
1 answer
666 views

What exactly are Norways problems with the NH-90?

Several news sources (here, or here) report that Norway wants to terminate its contract with NH Industries and they want to return their delivered NH-90 helicopters. The citation goes as follows: &...
user avatar
  • 1,441
3 votes
2 answers
131 views

How a power assurance check works?

In a Bell 407 the power assurance check takes into account torque, pressure altitude and MGT (measured gas temperature aka TOT). The flight manual states that if MGT when tested is less than or equal ...
user avatar
  • 425
-1 votes
1 answer
111 views

How is the helicopter throttle control connected to the transmission system?

Both the throttle control and the transmission system regulate the rotor blade RPM but how are they connected to each other or are they different from each other.
user avatar
  • 1
22 votes
12 answers
6k views

Why aren't swarms of cheap consumer-level drones a viable anti-aircraft tactic?

In the Russia/Ukraine war, when it comes to cheap, consumer-level drones, I've only heard of them used for reconnaisance, not for anti-aircraft defence. But given that: In civil aviation, a single ...
user avatar
17 votes
5 answers
4k views

Could a patient be too large and too heavy for an ambulance helicopter?

On the German news website BILD, there is a short video clip about a patient near Lauterbach being too large and with 150kg too heavy for the helicopter. Another source. Images on the site show it has ...
user avatar
0 votes
1 answer
114 views

What are the specific features of TY-90? [closed]

The wikipedia article about the TY-90 anti-helicopter missile mentions that China developed the TY-90 specifically as a helicopter-based anti-helicopter missile. This differs from the solution adopted ...
user avatar
6 votes
2 answers
208 views

How does the Sikorsky X2 technology rotor control blade pitch?

All of the helicopters by Sikorsky using their X2 technology coaxial rotor system don't seem to have a conventional swashplate and control rod assembly for controlling the pitch of the rotor blades. ...
user avatar
  • 962
4 votes
1 answer
173 views

How does a helicopter phasing unit work?

I'm currently distance studying to become a B1.3 technician and the course material mentions a phasing unit in the control system, but the descriptions and images are very abstract and I'm having ...
user avatar
  • 43
26 votes
2 answers
5k views

Are helicopters easier to fly nowadays due to computers?

4 decades ago, someone who seemed to know about helicopters said that hovering in one was like balancing on a ball (like bears do in a circus). But it seems like by using computers hovering and other ...
user avatar
  • 363
5 votes
2 answers
547 views

Do rotorcraft flight hours count for airlines requirements?

I have a question about flight hours. Many civil airlines require first-officers to have over 1500 hours. I have 300 hours for fixed-wing, and also have 2000 hours for rotorcraft(helicopter). In this ...
user avatar
1 vote
2 answers
221 views

There is any kind of advantage and disadvantages in making the blades of a helicopter off-center?

So, english isn't my first language, so I probably couldn't find any kind of information about it due to not being able to define what I'm asking. Anyway, helicopter blades are normally like this: An ...
user avatar
  • 453
3 votes
1 answer
193 views

How does this Bell 206 cyclic control linkage work?

I'm studying the Bell 206 Maintenance manual to understand how the pilot's control inputs get converted to swash plate movements. This diagram seems to explain the cyclic well, but I can not figure ...
user avatar
2 votes
1 answer
134 views

What is the name of the unequal lift distribution across a helicopter rotor blade?

A helicopter rotor blade will generate more lift at the fast-moving tip than at the slow-moving root, unless it is twisted or tapered. Wikipedia calls this "asymmetry of lift", however I ...
user avatar
7 votes
3 answers
341 views

Why do smaller RC helicopters have visible twist in their rotors, and slightly bigger ones do not?

Smaller, cheap, RC helicopters generally have very pronounced twist in their blades, and also vary their chord - slightly larger, slightly more expensive RC helicopters have no visible twist or chord ...
user avatar
  • 436
15 votes
2 answers
1k views

Is any of the Ingenuity helicopter's special design attributes helpful in improving helicopters flying in Earth's atmosphere?

According to Wikipedia, the Ingenuity helicopter is an astonishing piece of engineering having some attributes beyond the equivalent of the classical helicopters: The lower gravity of Mars (..) only ...
user avatar
8 votes
2 answers
232 views

What are the design principles that result in thin, long-span, narrow chord main rotor blades?

Regardless of the overall design configuration of a helicopter, it appears that helicopters have main rotor blades that all fall into the class of ultrahigh aspect-ratio wing design: that is, you ...
user avatar
0 votes
0 answers
120 views

What impact had the removal of the horizontal stabilizer end plate on the H135?

In the last update of the H135 helicopter line (EC135 T2 -> EC135 T3) Airbus removed the end plate at the horizontal stabilizer on the tail. I heard from some some people that they had aerodynamic ...
user avatar
  • 101
15 votes
3 answers
5k views

Why would "hot gases" from a volcano damage helicopter rotors?

In the ongoing story about someone trying to rescue dogs from a volcano with a drone, I keep seeing variations of this claim repeated: Spanish authorities have dropped food down to the dogs with ...
user avatar
  • 1,173
2 votes
1 answer
271 views

How do ultralight helicopter like mosquito manage to fly without a swash plate?

It doesn't seem to have a swash plate. Does pilot shift his weight like in a hang glider?
user avatar
  • 910
5 votes
1 answer
363 views

How a takeoff decision point(TDP) for vertical takeoff vehicle is defined?

For a vertical takeoff vehicle like a helicopter, how the takeoff decision point is defined or computed? Look at the snapshot below, seems the height of TDP is related to the rejected takeoff distance?...
user avatar
  • 1,589
1 vote
1 answer
110 views

Hover Performance in Helicopter dynamics

What do we mean by “good” hover performance in Rotor dynamics? If I want to analyse hover performance of a helicopter, then What parameters should I monitor?
user avatar
0 votes
1 answer
94 views

Can I fly part 91 a German certified and registered helicopter in the USA? [duplicate]

Can I fly part 91 a German certified and registered helicopter in the USA?
user avatar
0 votes
0 answers
77 views

Private Helicopter landing on Private land [duplicate]

Can I land a helicopter on my property in Palm Beach County? The property is 6 acres along the Loxahatchee River in Unincorporated Jupiter / Palm Beach County. What is the pertinent FAA or County ...
user avatar
  • 1
1 vote
1 answer
291 views

Do any RAF helicopters have skids instead of wheels?

Are there any current, or Cold War-era, Royal Air Force helicopters fitted with skids as standard? I seem to recall hearing, when I served, that RAF helicopters only ever had wheels, whereas skids ...
user avatar
  • 119
5 votes
3 answers
1k views

How do Private Helipads Work regarding Airspace?

For executive helipads or helipads run by a private company but not within airport airspace (tourism or shuttle helicopters for example), how do they work from a regulations standpoint? Do pilots just ...
user avatar
  • 1,411
11 votes
1 answer
1k views

Why there is a descent segment during helicopter takeoff?

I am reading some regulations about vertical takeoff vehicles like a helicopter and there is some takeoff path is defined as below, and I am curious why there is a descent segment in its takeoff path? ...
user avatar
  • 1,589
4 votes
2 answers
2k views

Can you identify this helicopter?

I saw this helicopter in Hungary. It might be an Airbus H225M, but I'm not sure. Can you confirm or identify it correctly? Unknown helicopter seen in Hungary What is the red spot on the side, under ...
user avatar
2 votes
1 answer
386 views

How can I calculate the torque of a helicopter's main rotor?

Might be a simple answer that I am overlooking but... I am attempting to determine the torque of a helicopter main rotor so that I can design an anti-torque rotor to counteract it. Anyone aware of of ...
user avatar
2 votes
1 answer
158 views

What’s the difference between the MD 500E and MD 530F helicopters?

What’s the difference between the MD 500E and MD 530F helicopters? They look almost the same outwardly, and I can’t tell the difference. I would assume parts of the 530F are more modern, but what ...
user avatar
  • 2,414
5 votes
4 answers
705 views

Can any helicopters use negative collective to descend rapidly?

On a helicopter, the collective is used to adjust the attack angle of all the main-rotor blades in the same direction by the same amount, causing the amount of lift generated to increase or decrease ...
user avatar
  • 26.2k
7 votes
2 answers
646 views

To operate on Mars, how large would a manned helicopter's rotor blades have to be?

I asked this question at https://space.stackexchange.com/questions/53931/manned-helicopter-on-mars but there was disagreement over whether a (now deleted) answer was correct, so I've re-asked it here. ...
user avatar
  • 179
12 votes
1 answer
2k views

What are those ball-shaped things on some helicopter blades?

I saw these things swinging in a video of a rotor from the blade point of view. I don't know what are they for but I am quite curious. And why some helicopters have it and some don't? Source: alamy ...
user avatar
2 votes
1 answer
79 views

What are the stability criteria of helicopters?

In airplanes, longitudinal stability is maintained if centre of lift lies aft of center of gravity. Like in the airplane shown in the figure below, do helicopters also have stability criteria? They ...
user avatar
  • 1,475
5 votes
1 answer
260 views

Why do helicopters not flip when using cyclic pitch control to move?

Let's say a helicopter wants to move forward. To do so, cyclic pitch is applied to the blades 90 degrees off which applies a torque on the blades to tilt the craft forward. Once the helicopter is ...
user avatar
9 votes
1 answer
696 views

Why paint a British roundel on a non-British Lynx?

In recent years, some of the Westland Lynx helicopters of the Portuguese Navy have undergone some form of mid-life update (MLU) in order to have their engines and avionics upgraded. Also, allegedly, a ...
user avatar
10 votes
3 answers
355 views

Could the Mars helicopter Ingenuity have been test-flown outdoors at JPL just for the heck of it? (not that they would)

The Ingenuity helicopter that has flown on Mars is designed for roughly 0.01 bar pressure and a colder atmosphere made of mostly CO2. See links (including video) in this answer to What JPL laboratory ...
user avatar
  • 4,556
4 votes
0 answers
120 views

Can we bring a rotorcraft like Ingenuity to an altitude of the same pressure as the one on Mars?

At Perseverance's and Ingenuity's location the atmospheric pressure is about 750 Pa (0.11 psi). On Earth, we find that pressure about 110,000 ft high. If we built a copy of Ingenuity, could we bring ...
user avatar
  • 165
5 votes
2 answers
681 views

What control inputs are required to perform a "turning-while-in-flight" maneuver in a helicopter?

My question is relatively simple and has to do with the required control inputs to perform a simple turning maneuver over a large area. Suppose a helicopter is traveling in forward flight, straight ...
user avatar
5 votes
1 answer
891 views

How does a hot tip-jet supply fuel to its engines?

Some tip-jets move their rotors by running jet engines on each end of the rotor. Obviously there must be some ways to supply fuel to those engines through a rotating body. How is this accomplished?
user avatar
  • 183
13 votes
2 answers
3k views

How does helicopter mustering make financial sense?

I've seen and know that helicopter mustering is popular in Australia and what I do not understand is why this works from a business perspective. Helicopters are expensive and dangerous machines so it ...
user avatar
  • 211
17 votes
1 answer
3k views

What are the spikes on Ingenuity's blades?

I am puzzled by the spikes on Ingenuity's blades (marked by a red box in the image below). What is their function ? Are these special to Ingenuity? Why don't they collide during high RPM? Don't they ...
user avatar
  • 281
13 votes
2 answers
2k views

What options are there in Canada for treatment of severe depression and anxiety for pilots?

I'm a Canadian commercial helicopter pilot, and I've been struggling with severe depression and anxiety issues since childhood. I'm very good at faking it, well, good enough that I've been able to lie ...
user avatar
5 votes
3 answers
1k views

Helicopter mast bumping in low g condition

The helicopter shown in the concrete pouring video seems to taking off from a hill and descending down in a way which can be classified as low G with low rotor loading. Although, the helicopter is ...
user avatar
  • 1,075
1 vote
0 answers
54 views

Why does the UH60 have a titled tail rotor? [duplicate]

I've been looking at helicopter design recently, particularly UK military helicopters. I've noticed that most tail rotors are parallel/flush with the tail of the helicopter in most designs. When ...
user avatar
4 votes
2 answers
213 views

Does anyone know if RHP (assumed to be rotor horse power) is equivalent to SHP (shaft HP)?

I was recently reading a NAVAER aircraft characteristics summary of the proposed XHCH-1 helicopter of 1951. In the engine section it gives the engine power in "Rhp" and later in a 1956 ...
user avatar
  • 41
3 votes
2 answers
339 views

How does gross weight affect helicopter autorotation?

The factors which affect helicopter autorotational aerodynamics include airspeed, gross weight, rotor RPM, and density altitude. The effects of these factors can be examined during a few phases of the ...
user avatar
  • 598
7 votes
0 answers
197 views

Why do GPS Copter Approaches require a slower final approach speed than conventional Copter Approaches?

AIM 10-1-2 says helicopter instrument approaches are designed with a maximum speed of 90 KIAS. However, it specifically exempts the final segment on GPS helicopter approaches, saying the maximum speed ...
user avatar
  • 598
2 votes
2 answers
254 views

How much is a swashplate system more energy efficient than a fixed blade system for the same load

When reading about the lifting capacity of swashplates (as found in helicopters) vs fixed blade systems (as found in e.g. DJI drones), I read a lot of comments about the fact that the bigger rotors of ...
user avatar
  • 107
1 vote
3 answers
149 views

Is there a way for the helicopter rotor to get its power half by wind, half by engine?

Imagine a gyroplane, if something happen mid-flight (when the plane is basically an autogyro and the engine provides no power to the helicopter rotor) and just the wind generated by forward flight can ...
user avatar
  • 315

1
2 3 4 5
12