dude thank you so much for your videos, im an ex fixed wing pilot learning helicopters on the flight sim and using your videos to feed my hunger for learning about these truly beautiful machines
At, 3:55, you go into the dissymmetry of lift, and explain that with Gyroscopic procession, the advancing blades create lift that translate to a NOSE-UP tendency. However, in your video explaining the Compensation for Dissymmetry of Lift, at 1:00 you explain "if dissymmetry of lift were allowed to continue without compensation, there would be no way to maintain forward flight. The advancing side would continue to produce more lift than the retreating side, causing a constant roll to the LEFT." I don't know if this is a mistake or if I'm just missing something. TLDR: In one video you say dissymmetry of lift creates a left-rolling tendency, while in this you say it's creates a nose-up tendency.
Hello there I'm Saul from Peru even though my mother language is not English but I understand I little bit , thanks 4 ur videos , it helps me to understand better how alot of thing works in rotary wings, I'm helicopter mechanic here fixing Huey II and EC145.
Thank you. Your instruction is concise and understandable. Although I only fly simulated helicopters in X-Plane (at least during this non-lotto winning period of my golden years) if I've paid proper attention to your tutorials they should be instrumental in my more effectively avoiding vertical ring states and settling with power during simulated attempted landings. I seem to be aces at crash landing. Getting something up in the air is one thing but getting that same something back to earth safely is the real trick shot.
Great stuff! In relationship to transitioning to forward flight & the T/R, it may be worthwhile to also mention dissymmetry of lift is increasing T/R effectiveness and reducing the left pedal/overall torque requirement. Thanks again.
I love your vids! As an IP I find them very useful! The only thing I’ll disagree with is that translational lift essentially“begins” at 16kts. From that moment the airflow is totally horizontal and continues to become more and more until climb airspeed. Until then at 10-20 kts (as you know of course) only the fore half sees horizontal airflow etc…
Great videos sir! Thanks a lot. A small question though: in the concept introduced at 3:40, don't the effects of gyroscopic precession and dissymetry of lift get compensated by cyclic feathering and blade flapping? Or they're greater than what can be compensated by these and a forward cyclic is necessarily required? I believe I am missing something, would appreciate if you could help.
Gandharv Mahajan. We compensate for Dissymmetry of Lift with blade flapping and cyclic feathering. Gyroscopic Precession is compensated for in the control rigging. I expanded on these more in my videos (Compensation for Dissymmetry of Lift ruclips.net/video/culBbvszRpk/видео.html) and (Gyroscopic Precession ruclips.net/video/MH1emIx5Ubs/видео.html). I hope these help.
Thanks a lot for your prompt reply, appreciated. So to clarify, the blade flapping (for DL)and control rigging (for GP) do not compensate for the effects of the blow back (4:00) and forward cyclic must be applied to prevent the helicopter from pitching up?
Helicopter Lessons In 10 Minutes or Less: I understand now. Thanks a lot and again, you're doing a great job with the videos. I'm watching them all multiple times before i begin training. Any tips for a person who's gonna start training for CPL(helicopter) soon?
Gandharv Mahajan. The biggest advice would be to have an understanding of the basics before you get started. By understanding the importance of ETL or IGE when flying can keep you out of a lot of trouble.
Well explained. The slight difference I recommend is the drawing from top down should have had forward flight in the same direction as the drawings above (if you get my meaning).
Tray Wilson. I understand what you're saying but for my videos I try to keep all top-down diagrams in the same direction for continuity. You can see in my Aerodynamics in a Takeoff video where I combine multiple aerodynamic forces from my other videos. I reasoned that having changing directions would muddy the water and make it harder to put everything together. I do appreciate the feedback though.
thank you very much for these wonderful videos. if you allow me I have a question. why do you say that the lift on the advancing blade is higher than that on the receding blade? even if it is already compensated by the beat articulation, so they must be equal
Thanks for your videos. Does dissymmetry of lift cause a left roll or a blowback? In your previous video on DL its states that it produces a left roll and is compensated with blade flapping and cyclic feathering but in this one it's compensating for a blowback. Just trying to understand how GP applies even to DL.
Very fascinating video! I recently read about Translational Lift in Mark Garrison’s book, “Guts N’ Gunships” where he describes the role of Translational Lift in getting their fully loaded Charlie Model Gunships into the air. This video really helped me visualize it
But wont the tip vortices always be present at the tip of rotors blades? Since the pressure difference is always present which produces lift, how can tip vortices disappear from tips? And as per the video, do airplanes too 'outrun' their tip vortices? Or they are always present, which I think they are?
The vortices primarily refer to the overall churning of air underneath the rotor system and are not limited to tip vortices. Once the helicopter outruns these, it is operating in a cleaner air environment. The tips will still spin of vortices but the helicopter should be outrunning most of the negative effects.
Rashmi Ranjan Nayak. That's correct. After passing through ETL, the rotor system outruns all of its vortices and operates in cleaner air. This means it is more efficient.
Lol this is all pretty awesome. Though I bet it would take a bit extra to explain what a pilot must do to combat these effects if they dont have a mixing unit like the larger helicopters.
Thank you Sir! Just passed my SIFT yesterday, I can finally ask you the name of the intro song, I can't find it anywhere, also love all your intros, they make me very excited to become an Army aviator!
@Aaron Rubinstein 58, I bombed the Spatial Apperception, was a very weird portion. These videos definitely help, I'd suggest reading the Federal Aviation handbook for helicopters
Generally a threshold. The speed varies by aircraft. But once you’re through it, the helicopter is outrunning it’s vortices and is efficient. Below it, the helicopter is churning in its own wake.
Hi, I think the switch you’re talking about is an ELT (Emergency Locator Transponder) it’s used of you need to alert the coastguard or similar that you’ve had an accident. ETL is a form of aerodynamics.
nice videos ,i really want to know how the AOA change when a vortex ring state at first until totally in . i know the basic thing i want more detail .if you have time ,please make a new video .please.
I now understand translational lift, ETL, and transverse flow effect all in six and a half minutes…beautiful…
dude thank you so much for your videos, im an ex fixed wing pilot learning helicopters on the flight sim and using your videos to feed my hunger for learning about these truly beautiful machines
I wish you worked at my pilot school. I feel you explain everything so clearly, thank you for your videos
We are waiting for more videos since a long time. Your content is so clean and easily understandable. Please upload more
Watching your videos is helping me understand what I’m reading in the FAA handbook so much!!
At, 3:55, you go into the dissymmetry of lift, and explain that with Gyroscopic procession, the advancing blades create lift that translate to a NOSE-UP tendency. However, in your video explaining the Compensation for Dissymmetry of Lift, at 1:00 you explain "if dissymmetry of lift were allowed to continue without compensation, there would be no way to maintain forward flight. The advancing side would continue to produce more lift than the retreating side, causing a constant roll to the LEFT." I don't know if this is a mistake or if I'm just missing something. TLDR: In one video you say dissymmetry of lift creates a left-rolling tendency, while in this you say it's creates a nose-up tendency.
Christian Cattell. Good catch! If left uncompensated for, Dissymmetry of Lift would cause a nose-up tendency due to gyroscopic precession.
Great information! helped me a lot in IERW for the UH72A
Taking the AFOQT tmrw! Feeling confident about rotor systems because of these videos, thank you!
Best description of helicopter flight I've ever heard. Great video!
Such great content, taught simply and well explained. Thanks for putting the time into creating this channel. Drawings are progressing haha.
Thank you soooo much!!! Such a great explanation!!! Thank you.
These videos are just awesome dude. Thank you!
Hello there I'm Saul from Peru even though my mother language is not English but I understand I little bit , thanks 4 ur videos , it helps me to understand better how alot of thing works in rotary wings, I'm helicopter mechanic here fixing Huey II and EC145.
Thank you for these videos 🙏
Thank you. Your instruction is concise and understandable. Although I only fly simulated helicopters in X-Plane (at least during this non-lotto winning period of my golden years) if I've paid proper attention to your tutorials they should be instrumental in my more effectively avoiding vertical ring states and settling with power during simulated attempted landings. I seem to be aces at crash landing. Getting something up in the air is one thing but getting that same something back to earth safely is the real trick shot.
Excellent explanation
Please add more videos as your videos are greatly helpful
Great lesson
your videos are the best!!!
just amazing
Excellent video thanks
thanks for the lesson please keep doing more content like this
Great videos! Please keep them coming
Great stuff! In relationship to transitioning to forward flight & the T/R, it may be worthwhile to also mention dissymmetry of lift is increasing T/R effectiveness and reducing the left pedal/overall torque requirement. Thanks again.
Nice videos. One suggestion....use different color markers for airflow.
My friend. Thank you.
I love your vids! As an IP I find them very useful! The only thing I’ll disagree with is that translational lift essentially“begins” at 16kts. From that moment the airflow is totally horizontal and continues to become more and more until climb airspeed. Until then at 10-20 kts (as you know of course) only the fore half sees horizontal airflow etc…
Excellent!!! Great review before check ride.
Thank you 😊
Good one again! Thanks
Great videos sir! Thanks a lot. A small question though: in the concept introduced at 3:40, don't the effects of gyroscopic precession and dissymetry of lift get compensated by cyclic feathering and blade flapping? Or they're greater than what can be compensated by these and a forward cyclic is necessarily required? I believe I am missing something, would appreciate if you could help.
Gandharv Mahajan. We compensate for Dissymmetry of Lift with blade flapping and cyclic feathering. Gyroscopic Precession is compensated for in the control rigging. I expanded on these more in my videos (Compensation for Dissymmetry of Lift ruclips.net/video/culBbvszRpk/видео.html) and (Gyroscopic Precession ruclips.net/video/MH1emIx5Ubs/видео.html). I hope these help.
Thanks a lot for your prompt reply, appreciated. So to clarify, the blade flapping (for DL)and control rigging (for GP) do not compensate for the effects of the blow back (4:00) and forward cyclic must be applied to prevent the helicopter from pitching up?
Gandharv Mahajan. Both blade flapping and cyclic feathering (forward cyclic) work together to offset that blowback effect.
Helicopter Lessons In 10 Minutes or Less: I understand now. Thanks a lot and again, you're doing a great job with the videos. I'm watching them all multiple times before i begin training. Any tips for a person who's gonna start training for CPL(helicopter) soon?
Gandharv Mahajan. The biggest advice would be to have an understanding of the basics before you get started. By understanding the importance of ETL or IGE when flying can keep you out of a lot of trouble.
Great video mate, can you do one where you explain the aerodynamics in an auto rotation - comparing the TAF on the way down
Good vídeo ! 👍🏾🚁
These military intros are awesome.
Great for me Just. Become interested in helicopters and the technical side
Only video I have watched where I got it in one, thanks for the simple to the point expl.
Are the effects of dissymmetry of lift felt before the effects of transverse flow?
muito bom
What is blowback? Is it just the gyroscopic precession causing a nose up?
Well explained. The slight difference I recommend is the drawing from top down should have had forward flight in the same direction as the drawings above (if you get my meaning).
Tray Wilson. I understand what you're saying but for my videos I try to keep all top-down diagrams in the same direction for continuity. You can see in my Aerodynamics in a Takeoff video where I combine multiple aerodynamic forces from my other videos. I reasoned that having changing directions would muddy the water and make it harder to put everything together. I do appreciate the feedback though.
Is it “to” ETL or “through” ETL?
Thank you 😊 #HLI10OL #SkyBaum
Is it ETL happened btwn 16-24 kts for all helicopters? Nice video btw. Thanks Jacob!
be a ahmad. The airspeed varies slightly but that range generally covers the range most helicopters pass through ETL.
Lemme guess: the variations in speed depend more on the diameter of the rotor disk than anything else?
thank you very much for these wonderful videos. if you allow me I have a question. why do you say that the lift on the advancing blade is higher than that on the receding blade? even if it is already compensated by the beat articulation, so they must be equal
Dissymmetry of lift
@@shamalkhan8551 yes dissymmetry of lift
great
Thanks for your videos. Does dissymmetry of lift cause a left roll or a blowback? In your previous video on DL its states that it produces a left roll and is compensated with blade flapping and cyclic feathering but in this one it's compensating for a blowback. Just trying to understand how GP applies even to DL.
Very fascinating video! I recently read about Translational Lift in Mark Garrison’s book, “Guts N’ Gunships” where he describes the role of Translational Lift in getting their fully loaded Charlie Model Gunships into the air. This video really helped me visualize it
But wont the tip vortices always be present at the tip of rotors blades? Since the pressure difference is always present which produces lift, how can tip vortices disappear from tips?
And as per the video, do airplanes too 'outrun' their tip vortices? Or they are always present, which I think they are?
The vortices primarily refer to the overall churning of air underneath the rotor system and are not limited to tip vortices. Once the helicopter outruns these, it is operating in a cleaner air environment. The tips will still spin of vortices but the helicopter should be outrunning most of the negative effects.
Nice one. One question ...At ETL level of flight is it more efficient than case one i.e in zero speed ground effect ?
Rashmi Ranjan Nayak. That's correct. After passing through ETL, the rotor system outruns all of its vortices and operates in cleaner air. This means it is more efficient.
Okay, but why would it pitch up/blowback if there is flapping to compensate? Wouldnt the flapping take out the effect?
I'm not a pilot but i understood your explanation. Very good.
Lol this is all pretty awesome. Though I bet it would take a bit extra to explain what a pilot must do to combat these effects if they dont have a mixing unit like the larger helicopters.
Thank you Sir! Just passed my SIFT yesterday, I can finally ask you the name of the intro song, I can't find it anywhere, also love all your intros, they make me very excited to become an Army aviator!
Most of the music is from the app Splice in its free music section.
@Aaron Rubinstein 58, I bombed the Spatial Apperception, was a very weird portion. These videos definitely help, I'd suggest reading the Federal Aviation handbook for helicopters
Hows the journey coming along?
@@cascadianapplications7124 I graduated as a 154F (CH47-F) pilot last month! Was a long journey, feel free to reach out with any questions!
You could add that on approach after you leave ETL that the blowback goes away and the nose drops back into a hovering attitude.
Ray Blevins. Good point. Thanks for the feedback!
3:58 ah so that's why my helicopters flip backwards like pancakes!
Is EFL a threshold or a envelope? Meaning, do I still experience EFL above and beyond 25+ knots or is it only at 16-24?
Generally a threshold. The speed varies by aircraft. But once you’re through it, the helicopter is outrunning it’s vortices and is efficient. Below it, the helicopter is churning in its own wake.
Why the helicopter is buftting during ETL ?
does this have anything todo with the ETL switch in an r22?
im trying to find out what that switch does in a sim
Hi, I think the switch you’re talking about is an ELT (Emergency Locator Transponder) it’s used of you need to alert the coastguard or similar that you’ve had an accident. ETL is a form of aerodynamics.
@@hangtenhelicopters4498 thanks
Speed of translation lift occurs at 12-14 knts according to my reference. Is it so??
Mbuyi-Gereon Lopa. All the references I’ve seen say 16-24. Which reference are you looking at?
nice videos ,i really want to know how the AOA change when a vortex ring state at first until totally in . i know the basic thing i want more detail .if you have time ,please make a new video .please.
siyu guan. Thanks for the feedback. I do plan on making a video covering Vortex Ring States / Settling with Power for this channel. Stay tuned!
Roger
After airborn th3n freefall gravity dif😂ferent than on ground and that is top secret in aerodynamics... Normally expect around 9.8 m/s^2
Use more colors.
ETL is a goofy theory like the downwind stall. Its a wives tale.
Let her fly
When do we get a face reveal ? 😶🌫️