That's mean the J-hook in video game or army sim game are unrealistic. You can't brake and drop attitude suddently. Airflow will create a vortex/donut causing lost all the lift, and the heli will drop like a friking rock.
They can, it just requires precise and consistent control inputs. Too much collective change too quickly is likely what would cause a VRS in a vertical landing. Also, they’re not very power efficient most of the time.
VRS happens because of the inefficiency of rotor for creating quick lift. In short the portion of the blade closer to the center will have zero lift. The heavier the chopper the longer the blades required to create higher lift. This will also create a large portion of the blade closer to center unable to create lift. When the chopper is descending, these portion of the blade which won't create lift will allow air to rush upwards. As long as the blades are producing downwash stronger than upwash of the center. Nothing will happen. But if the chopper descends too fast. The inner upwash will be stronger than downwash. Causing the downwash air to such into the centre and moving upwards. This won't create lift and the chopper will crash. The solution is not to use longer blades but to fly like electric drones with high efficiency fixed rotor blades. Due to poor energy density of batteries, it's impossible to electrify chopper. We need a breakthrough in helicopters design.
It is quite unlikely you would recover from fully established vortex ring state, as you lose control of the entire wing surface, therefore any cyclic or collective input has no effect. VRS comes from extremely poor handling and spacial awareness and 'incipient vortex ring' develops first. This is evident from increasing vibration and rate of descent. The best practice to exit incipient VRS is to lower the collective and nose forward to get the air flow over the disc again. Once above 30 kts ish, apply power and fly away. Doesnt look like this demonstration was remotely approaching VRS or even incipient VRS, which when developed will give a rate of descent of up to 8000' per minute. To get into VRS you need low air speed, typically less than 30 kts, high rod and then pwr applied. So much nonsense on you tube.
It is quite unlikely you would recover from fully established vortex ring state, as you lose control of the entire wing surface, therefore any cyclic or collective input has no effect. VRS comes from extremely poor handling and spacial awareness and 'incipient vortex ring' develops first. This is evident from increasing vibration and rate of descent. The best practice to exit incipient VRS is to lower the collective and nose forward to get the air flow over the disc again. Once above 30 kts ish, apply power and fly away. Doesnt look like this demonstration was remotely approaching VRS or even incipient VRS, which when developed will give a rate of descent of up to 8000' per minute. To get into VRS you need low air speed, typically less than 30 kts, high rod and then pwr applied. So much nonsense on you tube.
Correct me if I'm wrong but the story goes like this right? So the Swiss pilot Claude Vuichard had a lot of experience flying a helicopter somewhere around three or four thousand hours. He had a lot of experience with approaches and high and out of ground affect hovers. He knew the traditional recovery procedure of pointing the nose forward lowering the collective to lower the power which reduces the amount of power you're giving to the rotors which is increasing the vortices encompassing your rotor system which when in vortex ring state will only make the situation worse and also with a high pitch angle when is Vortex ring state such as when the collective is pulled up without the proper air flowing over the rotors such a high angle of attack cannot sustain lift with all the dirty air being fed back into the rotor system when in Vortex ring state. He knew to push the nose forward and lower the collective reduce the power and increase your AirSpeed and come out of the vortices and regain ETL. Claude Vuichard knew what to do when in vortex ring state and new when in a high out of ground hover to avoid getting into a descent rate and increasing the chances of getting into vortex ring state. One day though he was flying near the mountains and was in a hover and was being carried by an updraft. He was at a high altitude and the air was thin but he was being carried upwards by an updraft. Suddenly the updraft went away and he fell through into a descent rate the wind changes then was behind him and suddenly he was in Vortex ring State. He was quickly approaching the ground and all around him were obstacles such as trees other cliffs and such things of such a nature. He knew how to perform the regular recovery but the ground was coming up fast and he knew he didn't have time to regain his airspeed come out of the dirty air on time before the ground caught up with him. He was going to hit the ground and made a decision to step over to the right with the cyclic to a softer spot of ground and try and pull up on the collective to cushion the landing. In doing so he realized he'd come out of the vortex ring state and was holding a hover. He immediately pushed forward and continue to pull up on his power to regain lift and enter forward flight. After doing this he realized "there's a better way to recover from vortex ring state" and hence the Vuichard recovery method was created. Did I get that story right?
Fully-developed vortex ring state due to the helicopter decending into its own downwash. Pilot esacaped by flying the helicopter to the left, ino clean air. This is called the "Vuichard Manoevre".
Great idea .... One thing I don't understand the Lama is a CCw rotor sys( looks like I am not rated) and should escape to the right by description note "2" but instead in the videos it escapes to the left??! Someone could explain where IAm wrong?
GENIOOOOOOOOOOOO !!!!!! GRACIAS POR ESTE VIDEO. I ALSO TAKE OFF MY HAT TO MR.VUIVHARD BECAUSE OF HIS BRILLIANT TECHNIQUE, BUT WHAT IMPRESSED ME MOST, WAS HIS WAY OF SHOWING IT. CONGRATULATIONS AND I REITERATE MY GRATITUDE
I had heard of vortex ring state as a risk for helicopters and found this video. The visualization provided by the mist makes it stunningly clear what is going on and why it would be such a risk in flight.
So we apply full power, so as soon as you apply full power pedal you have over torqued your machine ( that is great if we are training ) You pop out of a fully developed vortex ring state within 30 ft from a ROD of 2000 fpm plus ? Going sideways not forward, so not in a great place to climb. Why not just push the cynic forward as one gets into incipient vortex ring.
I managed to wrap my head around it from explanations, and had a working mental picture of what was happening, but seeing it like that in such exact detail was unreal, great job 👏 👍
Vortex Ring State is a dangerous state to be in. The Vuichard Recovery Technique is a risky maneuver and in my opinion should only be attempted if no other better option is available. Don't believe me. Just pause the video at 3:38 and see just how close he comes to striking his own tail boom and he has obviously had lots of practice. Different models of helicopters the margin of error for this maneuver may be greater or lesser.
Thank you very much for your comment. The vortex ring state is a special flight state that should not be achieved in training, but as mentioned at the beginning of the movie: This video allows the vortex ring state to continue to develop for demonstration purposes. When practicing, recovery should be initiated at the first signs (lightness in the seat) in the initial stage of the vortex ring. On the other hand, I disagree that in the "Vuichard Recovery Technique" the rotor disc gets closer to the tail boom. In the sequence 3:38 you mentioned, it is a perspective from below that gives this impression! Look at other sequences, e.g. 2:55-3:00, and you will see that the rotor disc is high during the recovery. With the „Vuichard Recovery Technique“, additional power is applied on the rotor, which increases the rotor conicity. Also, during the lateral movement, there is no backward movement of the rotor disc, which move the rotor disc any closer to the tail boom. In the future, these maneuvers will certainly be practiced only in the simulator, so that pilots can use them reflexively in critical situations, as you also mentioned. It is clear that the best recovery technique is the one you don't need, so I will soon bring a new video on "How to avoid a Vortex Ring Sate in helicopter operations". Part I of III will be released in the next few months. Safe flights
MOOD MUSIC IS AS LAME AS PEE WEE HERMAN.. WHEN YOU PUT THESE OVERLAYS IN, YOU'RE SHOWING US HOW PATHETICALLY STUPID YOU ARE. DISTRACTIONS DO NOT MAKE YOU LEARN EASIER. AND IF YOU DIDN'T DO IT = IT'S STILL LAME AS FUUUUUCK!
