Damn, but that's a lot of parts, all pushing and pulling and spinning around. A single-rotor copter is complex enough, but this is crazy. No surprise that so far, only the Russian Kamov has made this arrangement work consistently. The various US Sikorsky prototypes apparently use a somewhat different system, where the inner, upper rotor shaft is also hollow, the control rods pass up through it and engage the upper blades from above, and there's one big control assembly at the bottom. I'm not sure whether that uses one big nested double swash-plate, or two separate ones.
A pedal turn in a coaxial uses the torque of each rotor to yaw the aircraft. In a stationary hover the torque of each counter-rotating rotor disc cancels each other out. To yaw, the collective pitch is increased on one disc and reduced on the other disc. Overall the aircraft still generates the same amount of lift, but one disc is producing more lift, and therefore more torque, than the other. The difference in torque between the rotor discs induces the aircraft to yaw.
Question: On single rotor classic helicopters, the cyclic control, operates 90 degrees ''before'' the swas plate is pointing, because of gyroscopic effect. For example the pilot leans the cyclic to the FRONT direction, the swash plate leans to the LEFT direction, so that with the gyroscopic effect, the helicopter will lean FRONT like the pilot wanted. What happens to coaxial contra-rotating helicopters? The contra-rotating rotors cancel each other on the gyroscopic effect of the cyclic control? The move-lean of the cyclic by the pilot is still 90 degrees ''before'' the swash plate, like the single rotor helicopters, or there is no need for that anymore and the cyclic control lean is in the same direction to the swash plate lean?
How are the rotor blades balancing done? It seems that determining which rotor was generating an out of balance vibration would be difficult, if not impossible.
This is a semi-rigid hingeless rotor, based on a Bell rotor which uses composite "flexbeams" (the black U shaped thingy) and elastomeric bearings. (in the blade grip root, the matte grey stuff is the elastomer) The flexbeam provides a bit of rigidity while the bearings have nice internal damping for the lead/lag motion. If you want to build a working scaled down rotor I'd recommend to make it completely rigid, flapping has little to no benefit on small scales.
amazing job if done from scratch that is, question though, unless the rotor blades are designed to be elastomeric materials where is the flapping and lead/lag hinges
I have made main-tail rotor model, and i'm thinking of making a coaxial rotor model. So I started looking at designs everywhere. Yours is impresive so i was thinking of building yours. Thats why I asked about the flapping hinges. I have no access to good quality elastomeric materials, so i have to do with Semi-rigid or fully articulated rotors.
As child I hated coaxial helis, becuase they looked different than I used to see. Now when I understand the advantages I just love them. This was modelled in solidworks, or something similar?
How does the coaxial rotor helicopter steer left and right if it doesnt have tailrotor. I am not talking about tilt. For instance standard helicopter rotates horizontaly by using tail rotor to move its tail left and right.
As far as I know there are 3 general types of rotor systems. The rigid system, wich i believe is the one you have unless i'm missing something, the semi-rigid and fully articulated. All others are a combination of these Flapping is needed so to compensate for disimetry of flight, also to reduce bending moment at the blade root or rotor hub. This was one of the first problems early helicopter designers ran into eg; (Juan de la Cierva).
you should see it, if you know what to see that is, question though, are the blades rigid unless they are made of elastormeric materials? and why does it need a flapping hinge anyways?
A very impressive animation! Great job. Maybe you can answer a question for me. How are pedal turns accomplished in a coaxial helicopter? What's happening in the rotor system to cause the fuselage to yaw felt or right around the vertical axis as desired?
Increasing the collective of one rotor, while decreasing the collective of the other, causes differences in torque to the helicopter, the two rotors do not cancel out each other 100%, and the helicopter makes yaw control.
Look for "differential pitch" in the video - the upper and lower rotors change collective pitch, but in opposite directions. More pitch for one rotor and less for the other means more torque reaction in one direction of rotation and less in the other, so the helicopter yaws.
Very good animation. Doesn't the two swashplates produce too much friction? Shouldn't be better to to place the whole servomechanism in the rotating zone?
i understand how the swashplates opperate but I was wonderimg, how to the blades spin two oposite directions on the same shaft? Im sure its not and one is outside and the other is in, but are there two motors? that wouldnt make sense. Answers would be very much apreciated!
+talksfor lifetwo It depends on the design and application. In real life size helicopters a differential gearbox splits the torque between the two rotors, primarily for safety reasons: e.g. if one engine quits the other engine can continue driving the rotors and optionally generator(s), oil pump(s), etc. (Some helicopter gearboxes can be quite complicated though.) There are also single engine coax rotor helicopters, in these designs there is obviously no other way than splitting a single engines torque. But for example in RC helicopters every gram is very important because the aircraft itself is very light and safety is not a major concern. So in very small RC's adding a gearbox would unnecessarily increase the weight, the friction and therefore would require stronger engines and carry more fuel to get the same result. There are RC helicopters with differential gearboxes though but usually the larger ones.
If this set of coaxial rotor is self balanced then why cyclical pitch adjustments utilized? Make whole structure robust and eliminate this chopper sound that all helicopter utilize for balancing.
Great animation and very complex,the only thing that you should add is a more details on the titles for person like me that try to understan how exactly works
Good morning everyone, sorry, I'm ignorant in the matter but I am very interested, I have three questions for you experts: 1 / coaxial exists in saving for autorotation ??? 2 / In the coaxial exists operation swashplate ??? 3 / Why is recommended not rise much with a coax ??? I thank you for your answers.
Hi , 1/Yes Autorotation maneuver is possible for coaxial rotors. 2/What do you mean ? I don't understand. There is 2 swashplate on the rotor. Each one is for a single rotor. 3/Probably to avoid upper rotor to interfer with lower rotor. But, i did never hear that. Look at some demo of Ka-52 for example, I'm not sure vertical speed input or flare is limited.
este video-animacion esta muy bien y estos aparatos tienen muy buena efectividad. y maniobrabilidad. pero son muy complicados tienen muchas piezas en movimiento y el doble de bielas tanto para el CICLICO como para el COLECTIVO. ( aparte de que cada rotor funciona en un sentido de giro )
ALOT OF RUSSIAN HELICOPTER ARE DESIGNED, BUILT, & FLOWN OF THIS TYPE OF ROTOR SYSTEM & HAVE DONE SO FER MANY MANY YEARS. THEY DO NOT REQUIRE A TAIL ROTOR SINCE ONE MAIN ROTOR CANCELS OUT THE OTHER IN FLITE. LOOK UP "KAMOV" HELICOPTERS HERE ON UA-cam!
Damn, but that's a lot of parts, all pushing and pulling and spinning around.
A single-rotor copter is complex enough, but this is crazy. No surprise that so far, only the Russian Kamov has made this arrangement work consistently.
The various US Sikorsky prototypes apparently use a somewhat different system, where the inner, upper rotor shaft is also hollow, the control rods pass up through it and engage the upper blades from above, and there's one big control assembly at the bottom. I'm not sure whether that uses one big nested double swash-plate, or two separate ones.
amazing job showing the rotor hub!, now can you show us the bottom Coaxial gearbox transmission? the flight controls & the input drive?
Mechanical engineering is a wonderful art
A pedal turn in a coaxial uses the torque of each rotor to yaw the aircraft. In a stationary hover the torque of each counter-rotating rotor disc cancels each other out. To yaw, the collective pitch is increased on one disc and reduced on the other disc. Overall the aircraft still generates the same amount of lift, but one disc is producing more lift, and therefore more torque, than the other. The difference in torque between the rotor discs induces the aircraft to yaw.
Thanks. Just what i wanted to know as my little RC does it in varying the differential speed of the two rotors.
When you think that sane people trust their lives to such sophisticated machines while being subjected to tremendous stresses it's just insane.
Question: On single rotor classic helicopters, the cyclic control, operates 90 degrees ''before'' the swas plate is pointing, because of gyroscopic effect. For example the pilot leans the cyclic to the FRONT direction, the swash plate leans to the LEFT direction, so that with the gyroscopic effect, the helicopter will lean FRONT like the pilot wanted.
What happens to coaxial contra-rotating helicopters? The contra-rotating rotors cancel each other on the gyroscopic effect of the cyclic control? The move-lean of the cyclic by the pilot is still 90 degrees ''before'' the swash plate, like the single rotor helicopters, or there is no need for that anymore and the cyclic control lean is in the same direction to the swash plate lean?
I assume the other swashplate is actuated 90 degrees in the opposite direction
Same doubt. Did you get an answer?
How are the rotor blades balancing done? It seems that determining which rotor was generating an out of balance vibration would be difficult, if not impossible.
Exacly. Coaxial rotor are really elegant designs
I think co axial helicopter will be very useful in future, will not it ?
Well done, superb animation and I love the music track.
This is a semi-rigid hingeless rotor, based on a Bell rotor which uses composite "flexbeams" (the black U shaped thingy) and elastomeric bearings. (in the blade grip root, the matte grey stuff is the elastomer) The flexbeam provides a bit of rigidity while the bearings have nice internal damping for the lead/lag motion. If you want to build a working scaled down rotor I'd recommend to make it completely rigid, flapping has little to no benefit on small scales.
uFN, do you own this coaxial rotor designed in SolidWorks or Autocad? Is there any way you can give me up or sell to an educational project?
Lot of effort into the animation. Good job.
amazing job if done from scratch that is, question though, unless the rotor blades are designed to be elastomeric materials where is the flapping and lead/lag hinges
This is beautiful animation
I have made main-tail rotor model, and i'm thinking of making a coaxial rotor model. So I started looking at designs everywhere. Yours is impresive so i was thinking of building yours. Thats why I asked about the flapping hinges. I have no access to good quality elastomeric materials, so i have to do with Semi-rigid or fully articulated rotors.
The music was made for this video in order to avoid youtube putting ads on it, thus it has no title as yet.
Viva Kamov!
Freekin work of art! What program was this done in?
As child I hated coaxial helis, becuase they looked different than I used to see. Now when I understand the advantages I just love them. This was modelled in solidworks, or something similar?
How does the coaxial rotor helicopter steer left and right if it doesnt have tailrotor. I am not talking about tilt. For instance standard helicopter rotates horizontaly by using tail rotor to move its tail left and right.
Superb Animation ! Extremely useful , But the music is Mind-Blowing ! Amazing ! Please Any link to download it ? and who Made it ?
Great video! With all those small parts on the assembly it makes choppers scary!
this was so helpful , i was finding for such a video ....gizz thanks
As far as I know there are 3 general types of rotor systems. The rigid system, wich i believe is the one you have unless i'm missing something, the semi-rigid and fully articulated. All others are a combination of these Flapping is needed so to compensate for disimetry of flight, also to reduce bending moment at the blade root or rotor hub. This was one of the first problems early helicopter designers ran into eg; (Juan de la Cierva).
you should see it, if you know what to see that is, question though, are the blades rigid unless they are made of elastormeric materials? and why does it need a flapping hinge anyways?
uFN, do you own this coaxial rotor designed in SolidWorks or Autocad? Is there any way you can give me up or sell to an educational project?
A very impressive animation! Great job. Maybe you can answer a question for me. How are pedal turns accomplished in a coaxial helicopter? What's happening in the rotor system to cause the fuselage to yaw felt or right around the vertical axis as desired?
Just increasing the speed of the upper or lower rotor u get yaw desired
Increasing the collective of one rotor, while decreasing the collective of the other, causes differences in torque to the helicopter, the two rotors do not cancel out each other 100%, and the helicopter makes yaw control.
@@rollingthunder6215 No - both rotors turn at constant speed.
Look for "differential pitch" in the video - the upper and lower rotors change collective pitch, but in opposite directions. More pitch for one rotor and less for the other means more torque reaction in one direction of rotation and less in the other, so the helicopter yaws.
Very good animation.
Doesn't the two swashplates produce too much friction?
Shouldn't be better to to place the whole servomechanism in the rotating zone?
how would you control that servo properly and precisely?
It produces no friction, LOL, - ball-bearing xD
i wish to make such a model how can i get more detailed information about the building
Simply awesome.
I am curious, if you have rotors going in both directions, do you still even need lead lag and flap movements for the blades
where can i get this music??? :O its amazing! and the animation...even better :D nice job man
i understand how the swashplates opperate but I was wonderimg, how to the blades spin two oposite directions on the same shaft? Im sure its not and one is outside and the other is in, but are there two motors? that wouldnt make sense. Answers would be very much apreciated!
+talksfor lifetwo Looks like a swash plate operation. Lots of youtube videos.
Kyle Simon alright listen, fuck u mean?
+talksfor lifetwo It depends on the design and application.
In real life size helicopters a differential gearbox splits the torque between the two rotors, primarily for safety reasons: e.g. if one engine quits the other engine can continue driving the rotors and optionally generator(s), oil pump(s), etc. (Some helicopter gearboxes can be quite complicated though.) There are also single engine coax rotor helicopters, in these designs there is obviously no other way than splitting a single engines torque.
But for example in RC helicopters every gram is very important because the aircraft itself is very light and safety is not a major concern. So in very small RC's adding a gearbox would unnecessarily increase the weight, the friction and therefore would require stronger engines and carry more fuel to get the same result. There are RC helicopters with differential gearboxes though but usually the larger ones.
there are 2 swashplates, cause 2 directions, and one shaft is inside the external, rod in barrel, simple as that.
uFN, do you own this coaxial rotor designed in SolidWorks or Autocad? Is there any way you can give me up or sell to an educational project?
That was totally awesome!
I suspected as much. Elegant design but I'm afraid it i might have to adapt it cuz i dont have access to such materials
Can I buy this model?
If this set of coaxial rotor is self balanced then why cyclical pitch adjustments utilized? Make whole structure robust and eliminate this chopper sound that all helicopter utilize for balancing.
No cyclic adjustment = no roll/pitch changes. Self balancing is only to a point where you exceed the flapping hinge dampers.
great video, anyone know what song this is?
Azure Behavior - Flowjob
Where are the oil systems?
Damn right!! Beat that air into submission. We're flying tonight.
They are safer than normal choppers
@@rollingthunder6215 lol!
Are they powered with the same engine
Yes, one engine (or two engines with their outputs connected) turn both rotors in opposite directions via a set of gears.
As we say in OZ. Bloody Awesome mate !
Great animation and very complex,the only thing that you should add is a more details on the titles for person like me that try to understan how exactly works
Con que programas hacen esta animación grafica ?
It's better if it's displayed in 2 blades per rotor than 4 blades which made it complexity seeable.
which software did you use for the drawings?
what did you use to render this video?
Hey! How did you rigged this? Can you explain please?
Wow, simply wow.
Good morning everyone, sorry, I'm ignorant in the matter but I am very interested, I have three questions for you experts:
1 / coaxial exists in saving for autorotation ???
2 / In the coaxial exists operation swashplate ???
3 / Why is recommended not rise much with a coax ???
I thank you for your answers.
Hi ,
1/Yes Autorotation maneuver is possible for coaxial rotors.
2/What do you mean ? I don't understand. There is 2 swashplate on the rotor. Each one is for a single rotor.
3/Probably to avoid upper rotor to interfer with lower rotor. But, i did never hear that. Look at some demo of Ka-52 for example, I'm not sure vertical speed input or flare is limited.
What’s up with the Europorn music
GREAT VIDEO MAN!!!!!!!!!!!!!
what software you used to draw this
Looks simple enough.
beautiful
music?
Fuck!!! the Russians are amazing designers
This animation are Amazing!
very nice congratulations
OMG real 3D explaining thhanks so much
este video-animacion esta muy bien y estos aparatos tienen muy buena efectividad. y maniobrabilidad. pero son muy complicados tienen muchas piezas en movimiento y el doble de bielas tanto para el CICLICO como para el COLECTIVO. ( aparte de que cada rotor funciona en un sentido de giro )
i saw this animation in my aircraft mechanical assembly class, but i came back for the song :D
for awsome things like this i chose an engeneering college... but till i can understand these concepst... and build my own... there is a long way...
good animation
that was amazing...
Must... get... the ... song...
Excellent film footage and animation. The soundtrack could be better. I watched it three times.
nah man the soundtrack is fire
I came out more confused that when i came in . please explain this to me slowly
I love this video and song
Very Cool!
KA 52 ALLIGATTOR
kamov made tail rotor just obsolete
why do they want to show two rotors upper and lower--=- one would be enough to learn from and better
Are you a Bill Nye the rocket scientist or what?
Instead of that disco music, someone could've explained the system verbally! Geez!
Nice
sumpah ni animasi keren banget. cara kerja dual rotor helikopter
Exactly like that.
uFN, do you own this coaxial rotor designed in SolidWorks or Autocad? Is there any way you can give me up or sell to an educational project?
De la mecanique à l'état pur
No, I'm Lionel the brain surgeon.
(I wonder if anyone will get this joke tho)
uFN, do you own this coaxial rotor designed in SolidWorks or Autocad? Is there any way you can give me up or sell to an educational project?
i would call it ,,, coaxial spinn-yodosha :)
ALOT OF RUSSIAN HELICOPTER ARE DESIGNED, BUILT, & FLOWN OF THIS TYPE OF ROTOR SYSTEM & HAVE DONE SO FER MANY MANY YEARS. THEY DO NOT REQUIRE A TAIL ROTOR SINCE ONE MAIN ROTOR CANCELS OUT THE OTHER IN FLITE. LOOK UP "KAMOV" HELICOPTERS HERE ON UA-cam!
Music distracting😵💫
Waaoooowwww... amazing
Sensacional.
this is super mach O.o
helicopter physics mindfuck me so much...
this is mind fucking it looks to real to be fake 0.o
Hmm. Double swash
Legal
just hit mute, and it becomes very enjoyable
Germany Bauma 2020
Wow great animation! check out V23 VTOL on youtube
Very confusing machinery 😣
RRRRRRRRRRRRRRRRR!!!!!!!!!!!!
What program did you use for this?