What is DUTCH ROLL?
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- Опубліковано 22 кві 2021
- 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
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.
Aerodynamics is so interesting.
Not aerodynamics, this is flight mechanics.
@@Dan474834 caused by the aerodynamic
I have followed hours of lectures on these topics and finally understood them in 4 minutes!
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
This was so helpful! Having a visual example is so much better than a textbook!
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
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!
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?
amazing job of explaining with visuals. well done
These videos are so perfect, thank you, even understandable to someone who never went to flight school :)
Thank you for the video! Good explanation
Glad it was helpful!
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.
This video was so helpful! No one explained it in a way I could understand the graphics solidify the concept 💯 subscribed
Beautiful voice and demonstration as usual
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.
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.
Things I’ve been trying to understand for over an hour made simple and easy to understand by a short video
Thanks for your graphical as well as vocal explanation
Thank your for the great explanation ! It’s very helpful! Keep up with these great work 😀😀😀
You're very welcome!
This is an amazing explanation, thank you! Greetings from Hungary.
Insanely worth my 4 minutes! Thanks
Good to see the level of appreciation here for your video, which is a masterful presentation.
Thank you very much!
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.
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.
Cost me 150 Euros in Amsterdam. I can't wait for my next trip.
Great video, great explination. Helped alot. Thank you.
Glad it helped!
Simple and clear explanation.Grest informative experience.
Best wishes to you and your team
Retd. B737 and A320.
Keep up with the great work ❤️ waiting for more and more videos
More to come!
Thanks for this great animation video - very useful!
Outstanding explanation. Thanks
Glad you liked it
Great do more it's helpful to understand.
Thank you, I will
Most outstanding description!
Thank you kindly!
Thanks very much for the video. The visual is very helpful
You are welcome!
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 .
Excellent presentation.
Thank you kindly!
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
Love your videos!! So helpful and easy to understand.. Thank you!!
You are so welcome!
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: ua-cam.com/video/WlwxH9SuH5M/v-deo.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).
LOVE U VIDEOS! THANK YOU!!!! SOMETHING ABOUT radio communication please!!!!!!!!!!!!
That's a great idea. Thank you so much!
This video couldn't be more calm. :D
Does it happen more frequently to Dutch pilots or something?
It is a bad day when the aerodynamic idiosyncrasies of your aircraft become interesting ! Just one pilot's opinion.
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… 🤓
Does a F104 Starfighter exhibit Dutch Roll?
How about a Cessna 172?
Really thank you, you help me understand 👏🏻😌💞
Happy to help!
Holy crap, do Pilots have to endure and calculate with this at every windy landing?
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
Watching a video about a Dutch Roll while smoking a Dutch Roll.
How do you design an aircraft to prevent this?
"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.
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.
NOW I know what a DUTCH ROLL is...👍
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.
This is nothing like a Dutch Rudder, right? They seem like they would be related.
Very nice explanation ;)
Thanks! 😃
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. 😬
Very cool, while you are at it, could you explain Dutch rudder as well?
THERE ARE ALSO **THE AMERICAN ROLL, THE JAPANESE ROLL, THE MIDDLE EAST ROLL, THE ARGENTINA ROLL, THE CHINESE ROLL, WELL, YOU GET THE IDEA!!**
So a Dutch roll is made with a Dutch rudder??
So what do,they call Dutch Roll in Holland? Just, Roll?
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?
Different source says the opposite about the lift and drag of the wings.It says left wing creates more lift and more drag in a similar position .
"DUTCH ROLL
If the aircraft is yawed to the right, the left wing advances (sideslip) and generates more lift, while the right wing slows down and produces less lift. The result of this imbalance in lift is rolling in the direction of the initial yaw. The advancing wing also produces greater drag due to the larger areas exposed to the airflow, which causes the aircraft yaw in the opposite direction. This results in the right wing producing more lift than the left wing, reversing the direction of the roll. The final result is rolling and yawing oscillation which have the same frequency." source ACE TECHNICAL PILOT INTERVIEW
in videos example it start with a roll whereas in my reference it starts with a yaw i am aware of that but still couldnt grasp the difference totally
i think i got it :D .There are no pilot inputs , so when aircraft yaws right, left wing produces more lift and more drag , but when aircraft ROLLs right. lower wing(right wing) creates more lift and more drag
my high ass thought this was a blunt rollin video
y does it yaw to the right? Shouldn't it yaw to the left?
Cuz drag is more on the left wing
I was deadheading on a flight from JFK to MIA and it was obvious that they were flying with an inoperative yaw damper. If I was flying it I would have been pissed. I found it annoying because I couldn't sleep--and I was sitting up front. The people in the back must have been miserable.
Explain "side slip"
When a plane drifts like a car... But in the sky...
If this interesting video exist when I was a kid, then I ended up being a pilot right now
I'd prefer a sausage roll rather than a Dutch roll.
My adult brain: "this is very interesting and so well explained!".
My childish brain: "I've been looking at an aeroplanes swaying anus for over 4 minutes".
PLANE IS DANCING!
2 dutch rolls with cinnamon please
It’s like, a little biscuit, but Dutch.
May we have a helicopter videos
Yes, great suggestion. We are also looking at making videos about drones. Thank you!
@@flightclubonline thank you for your interest I am waiting for your awesome
Nice explanation, but i wonder if I should feel offended, beïng dutch and all. Where does the name come from?
It looks like duck walk.
m8 i was trying to find out how to roll a joint without using as much paper
GOKOLONISEERD
Even this has got everything to do with the third law of Newton and the law of Bernoulli.
Why it's called dutch roll?
Or perhaps...."wobbling"?
There are various kind of things that you can call a "wobble" when it comes to flight dynamics
What do the Dutch call a “Dutch roll”?
Frikandel
ok now do this in a airtransat A310 with out rudder
Don't ask me why this phenomenon is named 'dutch roll', but yeah. I have seen them dutch. They have a hard time doing anything straight.
'Directional Stability' = How to get really quickly into the toilet.
But why is it called 'Dutch' ?
A white roll with cheese
now why is it called a dutch -roll tough?
now explain it without swept wings
Why? Straight winged aircraft will tend to return to stable flight much more quickly than a swept wing aircraft as the effective sweep of the wing is different (see 1.05) when yawing so this compounds the problem. Therefore it only really became an issue with fast swept wing aircraft.
1:55 "yoring plane"??? "yawrrring plane" ??? what
Bro its 3 a.m what are you doing
in your country :)
I know what a Dutch Oven is 🛌💨… but this Dutch Roll euphemism sounds like it might be something truly disgusting 🤣🤣
Did anyone else get airsick while watching this?
im still lost
Ik ben geroepen?
Go dutch?
Its when the pilot and copilot rolls separately
Right?
😂😂😂😂
If the pilot and the co-pilot roll opposite directions it would do nothing
Well, while this is an interesting discussion about adverse aileron yaw, this is in fact not a Dutch Roll. You are simply describing the yawing tendency created by adverse aileron yaw. A Dutch Roll is in fact a perfectly coordinated maneuver that I have taught students for over 50 years and takes a considerable amount of practice to do perfectly coordinated and the "ball" stays dead centered during the entire maneuver.
Honestly this is all wrong. Have You never heard about 'Pass the dutchie on the left hand side'. In technical terms, most people lean to the right side. That is why You pass the dutchie on the left side. -To counter-balance. Sheesh, and I never got my Cessna 172 certificate. Sheesh. My math is spot on.
guess now I can make a uselessly stable plane in KSP... tbh who tf makes stable planes in KSP?