Questions tagged [rotor-head]
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14
questions
42
votes
6answers
20k 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 ...
17
votes
1answer
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 ...
13
votes
3answers
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 ...
8
votes
9answers
6k 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 ...
7
votes
1answer
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 ...
6
votes
1answer
239 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?
5
votes
1answer
874 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?
5
votes
1answer
2k 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 ...
4
votes
2answers
930 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 ...
3
votes
1answer
433 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 ...
3
votes
2answers
1k 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 ...
2
votes
1answer
225 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 ...
1
vote
1answer
162 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 ...
1
vote
0answers
280 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% ...