What is DUTCH ROLL?
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- Опубликовано: 24 авг 2024
- Dutch Roll is a complex subject so we hope you will enjoy this simplified explanation.
If you are interested in this topic, @MentourPilot does a fantastic job explaining it in his video: • What is a "Dutch Roll"?!
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#flightclub #dutchroll
pov: you’re here after reading about Southwest…
Yeah I am here
Lol facts
Yeppers. And this video did an excellent job of explaining it to a lay person like me.
I'm here because of SW
No shit sherlock
Who ended up here after the news that a 737 max just had a dutch roll incident on it's way from Phoenix to Oakland??
🙋♂️
*waves*
Also looked up the Dutch roll in skating!
Me
Absolutely. The news articles did a piss poor job of explaining what a dutch roll is and whether it was an instability prone to any airplane or another problem with the Max 8. Clearly, the flying public is concerned.
I used to fly Boeing 737s and like most jets they had something called a ‘Yaw Damper’ this became part of the fly by wire software in later aircraft. The yaw damper used to input small rudder inputs to prevent or stop Dutch roll, the movement was imperceptible in the rudder pedals and there was a small gauge in the control panel to show that it was moving which was barely noticeable. One day I boarded one of the company’s aircraft at Gatwick U.K. to fly to Barcelona Spain and back. The only noted defect was ‘Yaw damper inoperable’ which I checked was allowable so off we went. A short while into that flight I decided that I would never accept a 737 for flight with that defect again (as Captain we have that right no matter what the manual says). The flight there and back was horrible, there was nothing that we could do to stop the Dutch Roll, yes the effect reduces until the next tiny bump or turn or whatever, it was safe but absolutely awful, it must. have been even worse for the passengers near the back.
I guess it's like having a car suspension with spring only and dead shock-absorber..? Is it?
Sir, i sincerely thank you for this comment. I keep on being surprised how do native enlish speakers explain and tell their stories so that every word and an event is literally feelable. The thing is that I am a FO for Aeroflot, my type is A320 and at the moment I am trying to make all those things that happen with aircraft to come "throught my skin" to start to understand them instinctively. Harsh times in the industry lead to imminent aircraft-bound-to-ground situations and flights when we have to dispatch under multiple MEL is increasing. Thanks to your comment now I know that without a yaw damping function it may be reasonable to insist on switching to another aircraft.
Hlo sirr ❤️
737s dont have fly by wire
@@hansloyalitat9774 They said that LATER aircraft had the functionality of this component as part of the fly-by-wire system, not that the 737 had one.
I have followed hours of lectures on these topics and finally understood them in 4 minutes!
Thus proving professors are overpaid windbags.
Just learned about that 737 that had this occur on May 5th. Was curious about what this was exactly. Thanks for the video
Thanks for watching!
Same
I wonder if there could be more occurrences but may not making the media. Can't pay me to get on that plane. Whistle blowers, who were employees who knew of faults with the plane, were strong and healthy end up dying when they in the midst of giving depositions? "Suicide" for the 1st and "sudden illness" for the 2nd 🤔
Read about it. Go ahead and Google it and read about it! 'Boeing whistle blowers'. There is a third whistleblower, but I have a feeling that poor fellow is scared to even breathe or think the word Boeing....
I just saw a news bite about a plane doing a Dutch roll. Thank you for the excellent explanation.
This was so clear and concise that even I got the gist of it.
Or EVEN me.
Great work guys. I have just recently passed my CPL Aerodynamics already. But this gave me better understanding of the dutch roll. Thank you.
Well done on passing a very difficult subject! Thank you for sharing and all the very best in the future.
Hlo sir ❤️
I still have one unanswered question, why is it called "dutch roll"?
@@Chimla Well, this is just a guess, but here goes. In the age of sail, Dutch-built ships were made to operate in the shallower waters prevalent near the Netherlands. Therefore, they had rounder bottoms and less keel, which made them a bit roly-poly in heavy seas, and caused them to make more leeway.
@@R3dp055um another saying is that the moving motion of a dutch roll looks like Holland skaters
Thank you for the good, clear explanations.
Above all, 100,000 thanks for taking the trouble to use the more specific term " aeroplane" or "airplane" instead of the generic, imprecise and overused term "aircraft". You are the first narrator I found to do this.
You are welcome!
Unwanted resonance can break anything apart, as demonstrated by Nicola Tesla when he tested his steam motor in his apartment. He nearly rattled the building to collapse by a piston that weighs less than a human.
Tesla's oscillator? Thank you for brining this to our attention. This is very interesting!
its a myth
As per the Wikipedia; The MythBusters made a device powered by electricity rather than steam. It produced vibrations that could be felt hundreds of feet away, but no earthquake shaking on the bridge they attached to; they judged that the claim that the device produced an earthquake to be false (i.e. a "busted myth").
Aerodynamics is so interesting.
Not aerodynamics, this is flight mechanics.
@@Dan474834 caused by the aerodynamic
This was so helpful! Having a visual example is so much better than a textbook!
Excellent video! Tomorrow, I have Flight Dynamics examination, for which this video had everything related to the Dutch Roll. ❤
Just love the accent and have noticed that the tempo of speaking is slower than the previous videos. Another amazing video you have made! Appreciated!
These videos are so perfect, thank you, even understandable to someone who never went to flight school :)
thank you boeing for teaching me something new every day
Thank you for making that easy to understand without being a licensed pilot!
Happy to help!
amazing job of explaining with visuals. well done
Amazing video! I truely love the speed and the rhythm of your vioce ! Thank you !
Thank you so very much! That's really good feedback as we a trying out a new style.
Vertical stabilizer area actually matters a lot less than vertical stabilizer height. As long as you're not stalling the stabilizer with >10° sideslip maneuvers, it should provide a similar force for a similar displacement regardless of the chord of the stabilizer. Just like a shallow and deep wing will create similar forces at low AOA.
Wouldn’t increasing the height increase the the surface area also?
Nice Video. Clear presentation. Also thanks to some real great inputs from folks who particularly discussed what was the use of the Yaw Damper.
You pilots really have a nice way of explaining by this I mean they can dumb it down . Good teaching skills.
Beautiful voice and demonstration as usual
This video was so helpful! No one explained it in a way I could understand the graphics solidify the concept 💯 subscribed
Here after reading a CNN article on a Boeing 737 Max 8 out of Phoenix that had this happen:
_Less than an hour after taking off from Phoenix on May 25th, the plane experienced an uncontrolled side-to-side yawing motion known as a Dutch roll while cruising at 32,000 feet. The pilots of Southwest flight 746 were able to regain control and the plane landed safely in Oakland, according to a preliminary report from the FAA._
_“It's pretty rare on modern airplanes,” Malmquist said, because the aircraft and their systems are designed to prevent a Dutch roll from occurring. Still, it’s important for pilots to know how to respond when it happens, he said.
“Obviously in this case they were,” Malmquist said. “That training is really, really critical.” _
_The Boeing 737 Max 8 jet involved in the Dutch roll incident is less than two years old. According to the FAA, a post-flight inspection revealed damage to a backup power control unit, known as a PCU. That system controls rudder movements on the plane's tail._
I feel like this video did a good job explaining. Scary stuff nonetheless. Also, more bad press floor Boeing, which is unfortunate.
Not unfortunate for Boeing. They prioritized money over engineering and are reaping what they have sewn. Air travel is extremely safe due to the countless hours of engineering and safety design that is put into these planes, and they are undoing a lot of faith people have in their airplanes recently, rightfully so.
It literally has nothing to do with Boeing. Dutch roll isn’t some new thing. The 737 is the best selling aircraft in the world, they are all experiencing the effects that can give you Dutch roll as we speak. It’s a pilot issue more than likely.
Jesus Christ people. The plane came out in the early 70s..
@@jeffb.5580 as concerning Dutch roll? When are we talking about in the late 60s when they designed the 737? The study of aerodynamics must be a new phenomenon that came around just around the time of the 737 MAX 😂
Whoever creates these videos God bless you! Never seen better explanation in every topic you are just flawless 👍🏻♥️
Great visual explanation, thank you!
Thank you very much for the positive feedback.
This looks pretty gentle. Why does it cause damage??
Awesome explanation!
Insanely worth my 4 minutes! Thanks
Montour pilot's long-winded explanation is actually less accurate than this simplified version and will probably leave you misinformed about Dutch Roll. If you want more info than this video provides I would read an aero text.
Things I’ve been trying to understand for over an hour made simple and easy to understand by a short video
Thank your for the great explanation ! It’s very helpful! Keep up with these great work 😀😀😀
You're very welcome!
Thanks for your graphical as well as vocal explanation
Good to see the level of appreciation here for your video, which is a masterful presentation.
Thank you very much!
Before this video, I somewhat thought that Dutch Roll and Adverse Yaw were pretty conflictual and were at variance with each other (like paradox) (if you know what I mean). Now I understand it much better
I think it's because the Dutch roll initial disturbance is not induced by flight control inputs whereas adverse yaw is. I think in Dutch roll there is no control surface displacement whatsoever and hence why it's all about the lateral and longitudinal stability.
i thought the same. What helped me is in adverse yaw there is a pilot input moving ailerons thus make the yaw in the opposite direction with the roll. but in this case initial roll and the yaw is in the same direction bc there is no aileron action .
I was a navigator on KC-135A (Boeing 707) 1970-1976 USAF SAC. The only time I experienced Dutch Roll we were very light weight and at a high altitude to conserve fuel. I thought that was the problem. Perhaps the aircraft commander had turned the auto pilot off and had the copilot flying the plane manually. I don't know if the autopilot included a yaw damper back then but I am guessing it did. Great video.
KC-135 Jet engine mechanic here (and history buff), 2016-2021... KC-135As did not have yaw dampers in your era. They werent added till about 1999. Your flight crew had to be trained extensively on how to counter lateral instability by hand. While 135A pilots were amazing at their jobs (it was a pretty damanding jet), this is a task that requires nonstop input on such an unstable plane. The result is occasionally, even good pilots could accidentally let it start going, or make it worse, if they were distracted by other tasks.
The 707, the 135's cousin, had yaw dampers for literal decades by 1999. The USAF didnt want to pay for the down time and upgrade. The result was an average of 2 fatal 135, crashes per year, MANY of which were the result of dutch rudder or lateral instability. It didnt get resolved until a high profile crash highlighted the negligence of the USAF in failing to add such a key safety feature, and the warranted public backlash forced them to finally update the aircraft.
Nowadays, the rudder damper does its job. Occasionally there is an uncommanded rudder issue. 135 pilots today are literally terrified of ANY sign of dutch roll or uncommanded rudder, due to the planes unfortunate history with this problem. They consider it an in flight emergency. Sometimes uncommanded rudder is a real problem, but I've also had some sound the alarm on it only for it to be imagined (for example, looking at aircraft data, I would sometimes find in rapid throttle changes on landing to cause one engine to spool up faster than the other.... Which feels just like uncommanded rudder).
If you want more info, look up code7700's article on the 63-8877 case study.
Funny having lived in south Holland, I would have thought a Dutch roll would be a crappy piece of bread that you’d have to pay someone to eat - under those circumstances the cloggies would be lined up for a good deal.
When I heard dutch roll, my first guess is when the pilot farts in the cockpit, and the re circulates the air thru the cabin!
Just a note:
Dihedral doesn't work by increasing the wing span presented to the relative wind. It works by increasing the AOA of the lower wing (picturing this is not easy and it requires 3D visualization).
I think the lower wing develops a greater vertical lift component, and this lift effects an increased AOA.
@@77thTrombone I think what matters is the wing surface projected onto the plane of airflow. With negative dihedral, the "upper" wing has more lift (leading to instability...and greater maneuverability.)
Great explanation. So as a layperson, I'm wondering can this affect the structural integrity of the plane? I think maybe yes.
Keep up with the great work ❤️ waiting for more and more videos
More to come!
Simple and clear explanation.Grest informative experience.
Best wishes to you and your team
Retd. B737 and A320.
Who's wagching this after reading that a boeing 737 did a durch roll on a southwest flight from PHX to Oakland?
Sometimes pilot control inputs can exacerbate dutch roll. AI pilot in Kerbal Space Program with BDArmory and FAR can often throw itself into wild swinging from Dutch roll. Especially if you give it something like a WW2 plane with a small vertical stabilizer and a large dihedral, then make it turnfight with it.
Ok nerd
Nauseating enough to make a Kerbal turn green?
@@AllahDoesNotExist Better a nerd than a blaspheming turd
This is an amazing explanation, thank you! Greetings from Hungary.
Great do more it's helpful to understand.
Thank you, I will
this voice is so calming
I'll take my Dutch roll with icing
Thanks very much for the video. The visual is very helpful
You are welcome!
The story is told of Tex Johnson, the pilot who did the famous barrel roll of the 707-80 over Lake Washington. On a commercial flight, the flight crew knew Tex was on board. Their plane went into a dutch roll, and the pilots could not figure out how to get out of it. They sent a call back for Tex to come to the flight deck. "Show us how to fix this, Tex." He reached over their shoulders to the autopilot, pushed the ON button, and smiled.
Outstanding explanation. Thanks
Glad you liked it
Great video, great explination. Helped alot. Thank you.
Glad it helped!
I got on here to see what a Dutch roll was
Could be useful to show two examples. Meaning what does a strong lateral stability design look like versus weak? And the same for directional stability (strong vs. weak design and simulations). Finally, is the only solution to make both strong? Or is there a sweet spot (not too much, not too little) that should be aimed for, and lowering lateral stability might be the answer instead?
Are you sure lateral stability during sideslip is due to change in area, not angle of attack?
It's actually a combination of factors on a swept wing design aeroplane. Diherdral (mentioned in this video) relates to the AOA changes in a sideslip. It contributes to lateral stability. We have a video on this subject: ruclips.net/video/WlwxH9SuH5M/видео.html
This is kind of an easy point of confusion between *dihedral* itself (up-angled wings so the toward-airflow wing has a higher AOA) and *dihedral effect* , the combined slip-roll coupling caused by dihedral, plus a few other aerodynamic factors that have the same effect. One of them being the toward-airflow wing of a swept wing airplane facing the air more directly, as shown in this video. Another big one being the wing-fuselage interference of a high vs low wing airplanes. (High wing contributing so much dihedral effect, that the actual dihedral is reduced to compensate... so much that it's negative, aka anhedral, in many high wing swept wing jets).
Man how bad was the dutch roll on that boeing plane to cause substantial famage?
Cost me 150 Euros in Amsterdam. I can't wait for my next trip.
Thank you for the video! Good explanation
Glad it was helpful!
Most outstanding description!
Thank you kindly!
Could not get an answer to a basic doubt. When the aircraft is banked to the right, it sideslips to the right, so the right wing experiences more drag on the right wing. Now what causes the aeroplane to yaw to the left ? The vertical fin is still in a position to make a right turn from the sideslip. Main question is what causes the aeroplane to yaw towards the left ?
Thanks for this great animation video - very useful!
Seems like it would feel similar to the instability experienced when hauling a hitched trailer load behind a truck with the weight distributed to the back of the trailer. Without the Yaw Damper it would be too easy for a pilot to overcorrect with the continued oscillation
I will put this on if I'm ever having a hard time sleeping.
I'd prefer a sausage roll rather than a Dutch roll.
It is a bad day when the aerodynamic idiosyncrasies of your aircraft become interesting ! Just one pilot's opinion.
Thankfully this Short video exists and not 30 minutes of explaining a bunch of useless information claiming to be a "what is a dutch roll" video from other creators.
exactly the explanation I needed... to explain how much I would crap myself.
LOVE U VIDEOS! THANK YOU!!!! SOMETHING ABOUT radio communication please!!!!!!!!!!!!
That's a great idea. Thank you so much!
shouldn't an aircraft rolling to the right be subject to LEFT adverse yaw???Don't understand why the aircraft sideslips to the right with right roll
Love your videos!! So helpful and easy to understand.. Thank you!!
You are so welcome!
I flew a Mooney that would duch-roll at high (lol) altitude over mountains. I got pretty good at yaw- damping manually with the rudder pedals..kinda like beating a base drum you just find the rhythm… 🤓
Excellent presentation.
Thank you kindly!
Southwest is serving in flight Dutch rolls now?
Made my head hurt. But hey I'd be having a fun time. Turbulence is fun. Wear a seatbelt kids. Do a barrel roll next! Always looking for my next NDE.
Soon as I seen the news on Facebook I came here
This video couldn't be more calm. :D
The Dutch: That's how we roll, yo!
Another video on here I have watched thanks to Boeing’s incompetence
this is simple aerodynamics, not because of Boeing buddy. Stop being a sheep
You’re only here because of your own incompetence….
This lady talked so slowly, she turned a 1 minute video into a 4 minute video. Yes, increase the play back speed. But good job on the explanation!!!
When we flew radio models with rudder-only control in the fifties and sixties, we always said that ten degrees of sweep was worth two degrees of dihedral. Not hard, Boeing
Really thank you, you help me understand 👏🏻😌💞
Happy to help!
How did we ever get by without RUclips?
I had dutch rolls served on my Southwest Airlies flight
Watching a video about a Dutch Roll while smoking a Dutch Roll.
Can someone familiar with aerodynamics reconcile the contradiction between the explanation given in this video about how the lower wing generates more lift and drag and an adverse yaw scenario in which the upper wing generates more lift and drag?
Show some love if you’re Dutch:
👇
All I know is that there's an STC for the old kingairs that correct for this with a few aluminium fins that cost ~15k.
Even with an English accent and cool animation….it sounds terrifying 😮
This is nothing like a Dutch Rudder, right? They seem like they would be related.
Oh yeah, the same move Han Solo did to lose those star destroyers.
It looks like duck walk.
"When an aeroplane is disturbed in a roll" -- what does that mean? I don't know, but when it happens, "the lift tilts to the side with the aeroplane". I could see that I wasn't going to get anything I could understand out of this video without a lot of rewinding and replaying, so I gave up a that point.
I play this video when I need to get to sleep.
So a Dutch roll is made with a Dutch rudder??
Wull, I thunk that a Dutch roll was sorta their answer to the croissant. Now I AM hungry, and the video didn't solve that problem one bit!
Holy crap, do Pilots have to endure and calculate with this at every windy landing?
Considering what I'm hearing here, that sounds like it's kinda dangerous. That being said, I'm guessing a shorter vertical stabilizer reduces overshooting.
Edit: Nvm, it does look dangerous! I thank bitikofl on my video recommendations for having a video of what it looks like. 😬
Boeing needs to have an FBI investigation and have all aircraft grounded indefinitely pending results.
I honestly think this isn't getting the attention in media as it should because it's summer travel season.
I mean a major control area of the plane experienced substantial damage.
'backup motor failed". Backup failed? What about primary motor?😮
Nothing to see/worry about....
Flight desk. You checking in.? Me. Ya is this a Boeing aircraft or Airbus? Desk. It's Boeing sir. Me Ohh for fuck sakes...
Very interesting! I was hoping you would give some history about this. Such as, Why is it called "Dutch" Roll? I have seen some drunk folk wobble like this...so why not Irish roll? Well, other than the fact, they are a fighting bunch and love them some fisticuffs😛 Its science, and was asking for a friend 🤣🤣 I have a Dutch friend, pretty sure he would call this a Belgian Roll! All his jokes start the same, "A Belgian walked into a bar...A Belgian was....". ...so yeah? Why Dutch?
Ever heard of that ugly Fokker, named Anthony? He was active in Germany too
Because it looks like skating and the Dutch are good skaters
No joke!
Or might it be because of the [nauseous to some] pastry of the same name?
THERE ARE ALSO **THE AMERICAN ROLL, THE JAPANESE ROLL, THE MIDDLE EAST ROLL, THE ARGENTINA ROLL, THE CHINESE ROLL, WELL, YOU GET THE IDEA!!**
Does a F104 Starfighter exhibit Dutch Roll?
How about a Cessna 172?