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Questions tagged [rotor-head]

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2 answers
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why does the rotor could head (Nr) "overspeed" if the collective is lowered suddenly, what is the Physics behind it

I know that in helicopters the N2 and Nr are coupled. I would appreciate a physical explanation leading to the cause of how the rotor blades could overspeed if collective (power) is lowered suddenly I ...
YamchaAviator's user avatar
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1 answer
242 views

Rotor system Weight of a Helicopter

I was wondering whether there is a "rule of thumb" or some kind of estimate (ideally with a source) that states how heavy a rotor system (blades, swash disk, actuators) typically is as a ...
Clex's user avatar
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0 answers
109 views

How much power and lift margin do helicopters have for hover?

Suppose you are designing a helicopter and trying to size the rotor system for hover and flight. Your helicopter has a certain gross weight at sea level, standard atmosphere. How much additional lift ...
Gerry's user avatar
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2 votes
1 answer
316 views

Does a cyclic in a helicopter essentially control rotor attitude?

So the basics of helicopter control as I understand it, at least, in terms of roll and pitch, are as follows: A helicopter is caused to move through space by means of tilting the main rotor disc, ...
Romeo_4808N's user avatar
1 vote
0 answers
286 views

What are these features on the V-22 ospreys rotor?

On the outside of the V-22s rotor fairings there seems to be some kind of hinged weights directly opposite of each of the three rotor blades. Does anybody know what their purpose is?
user33651's user avatar
  • 1,021
9 votes
3 answers
995 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. ...
user33651's user avatar
  • 1,021
5 votes
1 answer
997 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?
Mys_721tx's user avatar
  • 183
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 ...
lineage's user avatar
  • 281
4 votes
2 answers
2k views

What is the function of the Apache's Strap Pack?

I have recently been reading about the issues with the Apache's (AH-64) strap packs. I've read that the strap pack holds the rotor blades on to the hub. However, it appears the blade also connects ...
OSUZorba's user avatar
  • 2,639
5 votes
3 answers
7k views

How does a Delta-3 hinge on a helicopter tail rotor work?

I am trying to understand how adding offset hinges would provide a self-feathering force. Does anyone have more information on Delta hinges on helicopters? I am a bit confused with the information I ...
Gerry's user avatar
  • 838
2 votes
1 answer
278 views

Could a rotor head wing be plausible?

Could a helicopter support a detachable wing with no controls on top of the rotor head in place of a radar dome? Could the rotor head be made to support more weight? Would it be more fuel efficient at ...
Muze's user avatar
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1 vote
1 answer
218 views

What rotors would be best for atmospheric reentry?

What rotor blade set up would be the best for entering Earth atmosphere or to shed speed before landing in place of a parachute? I understand that the longer blades are more efficient, but are not as ...
Muze's user avatar
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1 vote
0 answers
409 views

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% ...
user avatar
3 votes
1 answer
826 views

How does the load transfer from a prop to the airframe?

I was just watching this video... Restoration and startup of a Wright 1820 Cyclone ...and it got me thinking: a propeller shoves back air, and this creates a forward force on the prop. The prop ...
MichaelK's user avatar
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3 votes
2 answers
2k views

Why is this type of rotor hub so rare...?

I wonder why is this type of helicopter rotor hub so rare... It is a very simple construction, having no flap or lead-lag hinges. A universal, constant-speed joint leaves the rotor free to find his ...
xxavier's user avatar
  • 11.1k
13 votes
3 answers
3k views

Would an aircraft with no ailerons, no elevators and no rudders be safely flyable?

With contrarotative propeller (or not, if twin engine), cyclic and collective blade control. Would such an aircraft be safely flyable, and how efficient would it be, assuming it can have perfectly ...
user avatar
43 votes
6 answers
21k views

Can a helicopter stand on the ground upside down on its rotor head?

From what I understand the rotor head needs to be strong enough to hold the craft weight hanging below it, and sounds pretty strong. The blades however look quite fragile (for a piece of metal). In ...
PTwr's user avatar
  • 549
8 votes
9 answers
7k views

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 ...
Kozuch's user avatar
  • 301
6 votes
1 answer
304 views

what is the statistical risk of head rotor failure?

What are the chances of rotor failure? What percentage of crashes are related to a malfunction of the rotor head?
Jesús Martín Berlanga's user avatar
7 votes
1 answer
2k views

What are the mechanisms fitted in the SA321G Super Frelon rotor head?

Past the cyclic-collective pitch control, I understand (maybe incorrectly) that additional mechanisms are required to prevent or limit vibrations and loads on the mast and the blades. Aerospatiale ...
mins's user avatar
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