Is 'Airwolf' possible with our current technology? (Supersonic Helicopter)

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SUMMARY

The forum discussion centers on the feasibility of creating a supersonic helicopter akin to the fictional 'Airwolf,' which is capable of reaching speeds over Mach 1. Participants highlight the limitations of traditional helicopter designs, particularly retreating blade stall and the need for structural modifications, such as adding wings and a thrust source. Suggestions include using advanced materials like carbon fiber and Kevlar, as well as incorporating technologies like ducted fan jets and AI for stability. Ultimately, while the concept is intriguing, the consensus is that a true supersonic helicopter would likely resemble a fixed-wing aircraft more than a traditional helicopter.

PREREQUISITES
  • Understanding of helicopter aerodynamics, specifically retreating blade stall.
  • Familiarity with supersonic flight principles and challenges.
  • Knowledge of advanced materials such as carbon fiber and Kevlar.
  • Awareness of existing VTOL and STOL aircraft technologies, including tiltrotor designs.
NEXT STEPS
  • Research the principles of retreating blade stall in helicopter design.
  • Explore the capabilities and limitations of the F-35B as a supersonic VTOL aircraft.
  • Investigate the CarterCopter and its approach to transitioning from vertical to horizontal flight.
  • Learn about the use of AI in stabilizing advanced aircraft designs.
USEFUL FOR

Aerospace engineers, aviation enthusiasts, and anyone interested in the future of helicopter technology and supersonic flight innovations.

  • #31
boneh3ad said:
330 km/h is a far cry from supersonic.
what he said (very small).jpg

@NCIS1996 this is a science forum. It's a good idea to have your facts straight before posting, 'cause folks WILL notice when you don't.
 
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  • #32
boneh3ad said:
330 km/h is a far cry from supersonic.
Well, in fairness, that's its listed cruise speed. Maybe it's got, like, afterburners or something to go lots faster?

:wink:
 
  • #33
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  • #34
Aaronvan said:
I don't see the need for Mach 2 helicopter even if it were possible.
Kind of reminds me of some tussle about A10 still having too high attack speed :doh:
 
  • #35
Aaronvan said:
I don't see the need for Mach 2 helicopter even if it were possible.
Seriously? You don't think the military would LOVE to have almost instantaneous transport to a drop zone or a pickup zone (or even "just" Mach 2 if it were possible)? I don't think you've thought that through.

They would LOVE to have a Mach 2 helicopter (but sadly it isn't possible). Convertibles like the Harrier just aren't the same since they have down-pointing jets during hover and that would make it a little tough to drop troops by rope or hoist up a litter.
 
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  • #36
Dominic Santini said:
Well, the best we could possibly do for it would make it a rudimentary plane with very little surface control. It'd be functional; just wouldn't be as effective at dogfighting as planes would be. So, then the problem would be that we need to fill the time gap between folding the helicopter blades (it isn't going to be speedy-- the faster the rotors need to be, the bigger it also needs to get compensatingly so) with something to counter-act gravity with. I estimate that there may be three or four minutes of getting the rotors to cease rotation, and then another minute to fold it inwards. Perhaps less.
Finally, someone that understands aerodynamics and has relatively the same thought as me. The real problem will be those wings though. That's why nothing up to the osprey has succeeded. And the lift and forward flight engines are the same and mounted on the wings that rotate with them. If you put a real even small sized set of wings under a rotor, it either nullifies or destabilizes the lift from that rotor. As for the folding and storing of the rotors, the jet engines could provide the forward thrust while that took place, provided that while thing didn't destabilizes the flight characteristics of the aircraft. There is a crap ton of hurdles to get over to even begin building something that complicated.
 
  • #37
boneh3ad said:
No offense, but I am reasonably sure that you don't know anything about supersonic or hypersonic flight, helicopters, or the challenges involved in designing such vehicles.
I think no one also did reasurch on mach angles created by the main fuselage and how blades would fit inside that angle/cone and as most of the blades stick past the fuselage they would be expost to even greater forces
 
  • #38
airwolflover said:
I think no one also did reasurch on mach angles created by the main fuselage and how blades would fit inside that angle/cone and as most of the blades stick past the fuselage they would be expost to even greater forces
So how fast can we get this helicopter to on its rotors until the wings will create enough lift to support the transition, how big would they need to be without interfering with normal hover mode then their is how is everything going to fit in a certain mach angle
 
  • #39
If you would take the hull of the comanche alone (reshape the nose and without rotors ) it would go like a misile over mach 1
 
  • #40
Dominic Santini said:
Well, the best we could possibly do for it would make it a rudimentary plane with very little surface control. It'd be functional; just wouldn't be as effective at dogfighting as planes would be. So, then the problem would be that we need to fill the time gap between folding the helicopter blades (it isn't going to be speedy-- the faster the rotors need to be, the bigger it also needs to get compensatingly so) with something to counter-act gravity with. I estimate that there may be three or four minutes of getting the rotors to cease rotation, and then another minute to fold it inwards. Perhaps less.
Then there is the question how big can we make the wings how much speed need to create enough lift.
Can we gain enough elefation to do maybe a nose dive transition to gain speed and time for the transition?
 
  • #41
airwolflover said:
So how fast can we get this helicopter to on its rotors
Probably about negative one miles per hour...
 
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  • #42
Next to all this, the question is what are helicopters designed for what role do they need to fill.
Supersonische flight ? No we have jets to do that.
So what then?
The function that i read about in the comments that i would think would be best is the wispher or silent mode.
Does it need to faster than any helicopter on the battlefield? It sure does!
Does it need to go supersonic?
Nope!
 
  • #43
airwolflover said:
Does it need to faster than any helicopter on the battlefield? It sure does!
This is why the V-22 Osprey.
 
  • #44
airwolflover said:
Supersonische flight ? No we have jets to do that.
You're missing the point. Jets require long runways. The Harrier is what you're looking for, or as @Nugatory pointed out the Osprey.
 
  • #45
airwolflover said:
If you would take the hull of the comanche alone (reshape the nose and without rotors ) it would go like a misile over mach 1
What on Earth is your point with that statement? LOTS of airframes would go over mach 1 if reshaped and with no rotors, just jets engines.

Hell, if you reshaped me (it would take some work) and put a jet engine on me, I could probably go over mach 1.
 
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  • #46
The CarterCopter referenced in Post #21 is the closest anybody has come to a stopped rotor helicopter yet. After over 20 years of development, they have not yet hovered more than 5 seconds, or got the rotor speed stopped. Their top speed is slower than current fast helicopters. The Wikipedia link in that post is still good, and does a good job of discussing the tradeoffs in slowed/stopped rotor fixed wing flying machines. More info, and the photo below, at the Carter Aviation website: https://carteraero.com/home2/. Note that their best L/D is 11, which is not conducive to high speed.
CarterCopter.jpg

But it has actually flown, so is not vaporware. It just has, at this time, no real world advantages over existing technology.
 
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  • #47
The Rotary Rocket orbital class rocket would have been a (very) supersonic helicopter by some definition of helicopter. However they (and all the other private rocket companies around at the time) lost funding in the early 2000s financial crisis so they only did four test flights of the concept, none of them supersonic.

https://en.wikipedia.org/wiki/Rotary_Rocket
 
  • #48
phinds said:
What on Earth is your point with that statement? LOTS of airframes would go over mach 1 if reshaped and with no rotors, just jets engines.

Hell, if you reshaped me (it would take some work) and put a jet engine on me, I could probably go over mach 1.
No reshaping required. Anything of any shape can go supersonic with enough thrust.
 
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  • #49
boneh3ad said:
No reshaping required. Anything of any shape can go supersonic with enough thrust.
Yes, but it would also fall apart rather quickly if it were not aerodynamic.
 
  • #51
phinds said:
Yes, but it would also fall apart rather quickly if it were not aerodynamic.
Not necessarily. Space capsules are not what is traditionally considered "aerodynamic" and they don't fall apart.

Of course, If any object is subjected to forces, from any source, greater to those it can withstand, it will fall apart. But that's not any kind of trait inherent to supersonic air travel.
 
  • #52
boneh3ad said:
No reshaping required. Anything of any shape can go supersonic with enough thrust.
At least "no reshaping required beforehand",
 
  • #53
IIRC, in early episodes, they warily disengaged rotor before lighting off the booster.
Later in series, even this sop to reality was ignored...
Still, disbelief politely suspended, 'Airwolf' was usually fun...
 
  • #54
phinds said:
What on Earth is your point with that statement? LOTS of airframes would go over mach 1 if reshaped and with no rotors, just jets engines.

Hell, if you reshaped me (it would take some work) and put a jet engine on me, I could probably go over mach 1.
Hahaha if you would crash and burn at least it would be a exiting way to go out...

What i really meant was the main fuselage is capable off that kind of speed right? Also the main fusalege is what would create the mach angle/ cone?
What happens to the rotors if they would stay inside the mach angle
 
  • #55
airwolflover said:
at least it would be a exiting way to go out...
I see what you did there... :wink:
 
  • #56
berkeman said:
I see what you did there... :wink:
😉
 
  • #57
So my question is this wat if we could keep the blades inside of the mach angle/cone created by the main fuselage some how (someting like the folding wings of a f14 tomcat) keeping the tips of the rotor blades inside the mach angle
Could we keep them spinning and use jet propulsion and stub wings with al the control surface of jet???
 
  • #58
airwolflover said:
What i really meant was the main fuselage is capable off that kind of speed
Yes and my point was, so what? LOTS of fuselages are capable of that kind of speed. But not helicopters
 
  • #59
phinds said:
Yes and my point was, so what? LOTS of fuselages are capable of that kind of speed. But not helicopters
Read my last post
 
  • #60
Asking a question that makes no sense doesn't make any point that I can see.
 

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