What is a "Dutch Roll"?!

[@Otacatapetl]

Your dog should be a pretty good pilot by now.

[@booooooooooooooooooooooo]

It took me a second to realize you typed pilot instead of pillow

[@nwazuemunachi6339]

😅😅 LOL.

[@harmonicajohn1059]

Trained aircrew dog… bites pilot if they do something wrong.

[@oppamaclare]

I don't think he's interested unless you can eat a Dutch Roll.

[@martinsachs3837]

doubt he can pass the drug test...this pub is on benzos

[@robertansley6331]

Cute little dog was showing us the _YAWN_ axis where she ended up remarkably stable on his port side.

[@zczvcb]

As a technical Aircraft engineer and aerodynamic instructor , this explanation is 100times better than many I have seen and read. I always like to give practical examples to students to understand such phenomenons . In the technical world , we always perform checks on damper system for force feedback etc.

[@donbaker5052]

Who came here as a result of reading about SWA 746 on a 737 Max 8 enroute from PHX to OAK on May 25, 2024? The FAA is now officially conducting an in depth investigation into why it went into a "Dutch roll".

[@lds251]

Me

[@jillcrowe2626]

Southwest only reported it to the FAA after 2 weeks. According to Bay Area News.

[@juliacozicova]

me

[@NightMotorcyclist]

then we had a SWA nearly crash into the PAcific, supposedly 400 ft away from the ocean

[@falconwaver]

Was it actually max related? Or could it happen to an NG with the YD inop?

[@bikkies]

This is why I love this channel. A quick ad at the beginning, a quick ad at the end, and in the middle is a nice calm and informative explanation. Just like a coordinated turn, I watch a coordinated video. Putting in just enough technical meat to keep me flying smoothly til I land safely and a little more educated at the end. I despise videos where I'm being constantly spammed with adverts just when I'm starting to get into the zone, even interrupting mid-syllable. Thank you for not being that person!

[@alc7692]

There's a pilot technique I learned during my B737 flight test work that will manually dampen out the dutch roll. With the yaw damper inop, momentarily just turn the yoke into the rising wing (for just a quarter of a second, that is), and return back to neutral. This raises the flight spoilers on the rising wing, dampening out the yaw effect. Repeat as necessary ...

[@bitchpudding8104]

They asked me on my first airline interview how to counteract dutch roll if the yaw dampers were inop! Thank you for this comment 🙏

[@birdman4274]

250 milliseconds LMFAO 😂😂

[@mysock351C]

@@birdman4274 I think most people can handle that unless they have the reaction time of a slug. At any rate, aerodynamically its really just to try to level them out slightly and limit the side-slip directly rather than guessing using the rudder.

[@birdman4274]

@@mysock351C Did he measure it with an atomic clock. What error can we apply to the 250ms ?

[@mysock351C]

​@@birdman4274 Using a simple fraction such as "1/4" implies low precision. People generally understand that a "quarter second" indicates a relatively short amount of time in our subjective perceptual terms. Generally anything less than one second will likely work. This is NOT the same as "250ms" which implies a precision down to 1ms. This is actually known as _significant figures_ (or significant digits) and is an important concept people should have learned in school or college. Certainly most airline pilots would have, and know that it just means "Don't turn the damn yoke for as long as you like. You'll crash the plane."

[@michaell7149]

I find myself staring at your dogs during these videos! As an aviation enthusiast and frequent traveler love this channel. Thank you!

[@sylviasanchez7500]

They are adorable. There is a whole back story going on there with Patches N Molly and the crew there at Petter's crib, lol.

[@jdwilliams518]

Sometimes they go behind him and stare at the back wall for no apparent reason..

[@davetx-od6pb]

Back when the 737-100 was new my dad was the manager for the Conductron 737 flight simulator program. Dad brought the family in to see it on a weekend and I got to sit in the right seat and "fly" the SN 2 simulator with Boeing test pilot Kit Carson in the left seat. He was checking out the simulator before accepting it for delivery. The first thing I did was put the simulator in a Dutch Roll. Kit Carson was the man who introcuded me to that term. The Conductron 737 flight simulator was the first all digital flight simulator where the flight dynamics were calculated using numerical methods in the digital computer instead of using analog computers to do those calculations.

[@kratokat3431]

This guy made me an aviation enthusiast❤

[@mog882]

I came up with the term “feathered fish” while I was tripping on ketamine and a ketamine clinic. It just popped into my head, “my fine ‘feathered fish.” I thought it might’ve been a significant find so I did a web search for “feathered fish.” Now you know this.

[@topsu4896]

Welcome❤️

[@raidzor5452]

NPC #7125366 I once pissed in a hairdryer

[@Trauncher]

If you don't fly., contact your local airport flight school, and ask them if they have any introductory flights available.. I know the EAA at one time sponsored a 1/2 price first hour.. Just about anyone can do it. go take a lesson. you'll never forget it! :-)

[@thatdevg]

Who’s also here after the Boeing 737 Max news???

[@markyhutt]

I’m here to see how many other people have made this exact same comment after the guy who made the original comment just 4 hours ago on the video before this.

[@davidgardner1067]

I'm going to fly on a MAX in a few weeks. How comforting😂.

[@sweorfan6844]

Huh?

[@aght44]

Me from Germany....

[@kenneths.2298]

Straight from Juan to Petter 😅

[@tariq8890]

Thank you for flying with KLM. For some appetisers, we'll be served Dutch Rolls

[@jamescaley9942]

There was also AA587 that crashed in New York in 2001. In response to turbulence the pilot used excessive rudder inputs with several rapid reversals. This was a positive feedback loop which ended in the vertical stabiliser separating as it the loads were beyond the design limit.

[@rabuly77]

So we study this phenomenon in aerospace engineering. Our professor told us that the name came from the fact that the Dutch were, back in the day, sailors who spent very long times at sea, inherently getting used to the movement of the boat caused by the waves. Once they got to port and stepped on steady ground, they were known for struggling with the balance and walking in this characteristic manner weiving from left to right. Since the movement of an aircraft was somewhat similar, the name was attributed to this stability mode. This explanation is rather anecdotal and I have no idea if it is even true. Anyway I just wanted to share this with all of you. As usual, awesome video and awesome explanations. Keep it up!

[@michaeldougfir9807]

Not that it is important here, but when I was a helmsman on a ship, we too had a rudder angle indicator. This reminded me of it for the first time in many years. Thank you for a good explanation. I am not a pilot and feel that this was made very clear even to me. Thank you!

[@YammoYammamoto]

Been flying different simulators online for over 10 years.... ....every episode there's something new to learn. Thank you! :)

[@Hopeless_and_Forlorn]

The problem of Dutch roll on swept-wing aircraft was first encountered during flight tests of the revolutionary Boeing B-47 bomber, some seventy years ago. The first yaw damper system was developed and installed on that aircraft, and then carried over onto commercial models of swept-wing transport aircraft. The cockpit yaw damper indicator which Mentour mentioned was not installed to indicate yaw damper movements in flight, but to allow flight crews and maintenance to verify proper yaw damper operation while the aircraft was safely on the ground. To facilitate this, a test switch below the indicator could be pushed to the left or right to initiate a deflection of the yaw gyroscope in the yaw damper coupler, simulating a yaw of the aircraft. The rudder movement in response to the yaw damper output was clearly visible on the indicator. One day, a pilot for an early operator of the Boeing 737-200 aircraft decided to test the yaw damper in flight. Unfortunately, the response to his actuation of the switch, which was not intended to be used in flight, was not attenuated by the high airspeed of the aircraft, as was normal yaw sensing and processing. The resulting, excessive rudder movement caused severe yawing of the aircraft and, as I remember, injured a flight attendant. Shortly after that, plastic guards were installed over the yaw damper test switches as a reminder that they were not to be used in flight. On those early B737 aircraft, it was allowable to dispatch an aircraft for a flight with an inoperative yaw damper, with certain restrictions on use of the autopilot at altitude. Flight attendants dreaded flying on an airplane without yaw damping. The resulting Dutch roll in flight was barely discernible to most passengers, but frequently resulted in motion sickness among passengers seated aft, far from the aircraft center of mass. This manifested itself in vomiting by the affected passengers, which affected passengers seated in the next row forward, and so forth, and might result in a large number of airsick passengers by the end of the flight. Not too many years previous to this phenomenon, passengers routinely experienced far worse while flying through turbulent lower altitudes in slow moving DC-3s. In some ways the golden age of air travel had a greenish tinge to them.

[@bugsysdadenterprises]

The movement induced by a dutch roll is about one of the worst for producing motion sickness. The back of the aircraft is essentially making a 'figure 8' that is just sloshing the inner ear in all dimensions== Those technicolor yawns start to happen. Moderate chop and higher, is moving the fluid around 2 axes that is uncomfortable to say the least but nowhere near the dutch roll. The poor devils in the aft loos are gonna be in there awhile regardless of why they went in to begin with. 🤢🤮🤮. The varying movement is what really causes the dizziness that escalates. This is why folks get seasick, because the ship is moving in all directions, depending on waves, wind and ship design. Newer passenger ships have some advanced dampening systems that go a long way to keep the pax comfortable, but encountering bad weather resulting in following seas is just misery on top of misery, even for experienced crews on occasion. The real hell on the water, is being in a sub, stuck on the surface or unable to dive deep enough to get out of the ocean actions. Modern submarine hulls are completely round for speed and quiet operating. On the surface there is nothing to dampen the rolling and pitching that happens.

[@dehoedisc7247]

I once duplicated the principle of "Dutch" roll in an automotive context, when I was towing a Pontiac Tempest with a much lighter IH Scout with 4 cylinder engine. At about 45mph the front suspension went into a slight drift to right, then cycled back to do a drift to the left. Basically a resonant "S" back and forth. I guessed that if I put steering inputs that might cancel out the mechanically worn out and out of adjustment front end components. It worked. The tow rig was now running as straight as an arrow while the tires were doing one heck of a sort of sidewinder dance back and forth. Good thing it was a short haul, not really safe.

[@Doc62J]

My son experienced this on a large air force plane last summer. Scariest moment of his life, he thought his time was up. Kudos to the flight crew for recovering and making a safe landing.

[@BADSQ]

I'm so happy I found you Captain!I just learn so much like how fast things go wrong.Even on auto pilot,it disengages then if your incapacitated,the first officer panics and is usually not ready to do everything like checklists and flying...

[@ditzygypsy]

I was in the very back row of a WestJet 737 landing in a very windy Montreal and the plane did exactly that. Rocking side to side and twisting left to right while the nose pitched up…and then down…and then up again. Of course I thought we were going to either flip over or go right off the runway. 😂 Holy crap. I didn’t know it had a name!

[@Gohan-chan]

Japan Air 123 lost most of it's vertical stabilizer, and in addition to losing all of it's hydraulic systems, was experiencing severe Dutch roll due to missing the stabilizer. It's amazing that the pilots kept that plane in the air for 32 minutes after the tail came off. From looking at the FDR data, that plane was rolling as far as 80 degrees from horizontal roughly every 12 seconds because of it.

[@artofnoise5013]

Revisiting this video after the Southwest incident in Hawaii!

[@EleanorPeterson]

I loved this. Although I got my PPL (now lapsed) on a Cessna 172 AGES ago, I still do a lot of kite flying and aeromodelling. I started out with free-flight aircraft as a kid and gradually moved on to RC planes. Lots of homemade designs, lots of experiments, lots of mistakes. Without necessarily understanding the scientific aspects of aerodynamics very deeply, old-school aeromodellers used to get a pretty good grounding in the basics of flight dynamics and stability without really knowing it. Many of today's expert RC modellers are terrific pilots, but they miss out on a lot of fun by only buying ready-to-fly planes, pre-trimmed, tried and tested. But playing about with your own designs and drawing up 'what-if?' plans is fascinating and fun. Dutch rolling was most noticeable on gliders (of around 10' wingspan) when free-flight designs were converted to radio-control. Early RC gear was very simple, offering just one channel: rudder only. To avoid constant crashes (no elevator, so pitch was non-negotiable!) the planes had to be self-stabilising, and the wings had lots of dihedral or even polyhedral. Touching the rudder gave a turn, plus a lot of swooping and wallowing; there was all sorts of fun playing about with dihedral, wing sweep, tail moment and vertical stabiliser area to reduce it. The problem disappeared when radio gear allowed full control (elevator and aileron, with less extreme dihedral). Happy days... :-)

[@T_210]

Time to revisit this video

[@t0cableguy]

I enjoy watching your videos about the way planes work and how to fly them even though I'll probably never be a pilot, because they put my mind at rest for being a passenger in a plane.

[@rs.aryaman]

A similar thing happens while riding a motorcycle where the handlebar starts wiggling rapidly from side to side. We call this a "Tankslapper". And we use something known as a steering damper to counter this motion.

[@aerocap]

I liked.. The explanations Your voice The adorable dogs Your expression on the thumbnail 😅

[@arynschroeder4756]

I HAVE 2 QUESTIONS, 1.PASSAGERS DEALS WITH JET LAGS FROM LONG FLIGHTS, HOW DO YOU PILOTS DEAL WITH THAT? 2. SEVERAL MONTHS AGO, A AIRLINE COMPANY DID A NON-STOP FLIGHT TO AUSTRALIA ( I THINK.) IT WAS LIKE 22 OR 21 HRS. THEY DID TESTING ON THE" PASSAGERS" DURING THIS FLIGHT ALSO. WHAT DID YOU THINK OF A FLIGHT THAT LONG FOR A PASSENGER AND CREW? (I TYPE IN UPPERCASE BECAUSE IT'S EASIER FOR ME TO READ WHAT I JUST TYPED SO THAT I CAN MAKE CORRECTIONS EASIER.) ALSO, I WANT TO SAY THAT I LOVE YOUR VIDEOS!! I REALLY LIKE THE WAY YOU EXPLAIN THINGS AND BREAK IT DOWN IN WAYS THAT A DUMMY LIKE ME CAN REALLY UNDERSTAND AND GET IT. AND YOU HAVE A FANTASTIC DAY WHEREVER YOU ARE!! MY FRIEND!!

[@davew5383]

This is very interesting, I have never heard of a Dutch Roll before. I have heard about airplanes having a Yaw Damper but I have had no idea how it worked until this video. I really like how you explain it with lots of details, like having the video showing what a Dutch Roll looks like. It was very interesting to find out that the 707 had a Yaw Damper, I would think that it would be something more recently on airplanes with all the computer controls they seem to have these days. It sounds like a Yaw Damper on an airplane is kind of like cars now having stability control on them. Thank You Very Much, for making this video, I enjoyed it very much👍🙂

[@brown-eyedman4040]

I know what a Dutch Crunch roll is. Apparently this is completely different.

[@davew5383]

@@brown-eyedman4040 Apparently🤔

[@carlosdaroza]

Would not a yaw to the right mean that the direction of the airflow relative to the nose-tail axis be to the left, i.e. skidding with the left wing forward?

[@davidbristow69]

A yaw damper can be implemented with an analog control circuit. For the last several decades it's been easier to implement it in code in one of the avionics computers.

[@brianw612]

My flight instructor was demonstrating dutch rolls during one of my first lessons, got carried away while I was feeling sick.

[@harrisonhine243]

Hi Mentour - I have enjoyed your KZbin Videos and want to make a comment about what happens later in life for an airline employee. My wife was a flight attendant for United Airlines for 34 years and retired in 2003. (Obviously we are now in our early 70's) She retired with both flight benefits for life as well as Health Insurance for both of us. We have enjoyed both and thankfully United is still in business. I know the listing status of SA travel varies by airline but at United boarding priority is by seniority. That fact has been a boon to us since her 34 years usually puts us at the top of the standby list. However, after so many years we know never to count on getting on a particular flight. The nice thing about the system United uses now is that we have access the the actual load factor for each flight as well as the other employees/retirees that have listed for the flight and their seniority. It makes the process easier but it is never full proof. Also there are many times when we have been delayed for days (5 days in Honolulu, 3 days in Rome) waiting to get to our destination. We have also made very unusual routes to get from point A to point B because that is where the seats were available. I think many new airline employees and their families have an unreasonable expectation of what pass flying is like and they need to know that you have to be flexible and go with the flow always allowing extra time to get to and from your destination and back home again. The most upsetting thing we have seen is for un-accompanied companion passengers who are new to pass ride flying being upset because they don't get on a particular flight. I think you should do a segment on the joys and tears of Pass travel. Cheers from Florida!

[@GaryKlare]

Thanks

[@MentourPilot]

Thank you so much for your wonderful support!!

[@brealistic3542]

Excellent explanation of Dutch Roll. The NASA experiments into lifting bodies had this. The Space Shuttle used computer stability to help stop it. In my heart I believe there is a way with aerodynamics to minimize it in these lifting bodies.

[@vincentiusnuringsaptadisur7061]

I really love how you explained technical things such as this. I am an aviation engineering student and understand more clearly from your video than my lecture :) could you also maybe make a video about Roll Subsidence and Spiral? I would definitely share this sort of educational video.

[@Zorroxyz123]

That would be very useful too.

[@EleanorPeterson]

A Dutch roll is malicious; a Swiss roll is delicious. ;-)

[@IansModRite]

A beauty of a comment. Thank you elli

[@thermalpower6277]

fantastic interpretation........ this guy has a tremendous clarity on the subject matter...

[@BillyKirbyUK]

Petter, these videos of yours are so much more useful than all the classes that I might - or might not - have taken. A great explanation of stability.

[@GNX157]

MentourPilot, thanks for making this video. I had made a request for a video on this a while back and thought it would never get made. I understand it much more now.

[@Zany4God]

Another great vlog. I'd never heard of the Dutch Roll. I can see how important it is to let the plane do the correcting. Thank you.

[@iPeter-ky3zs]

right? right! when i see something about airplanes such as ditch roll in the news... i come here.... i learn about it... while being entertained... right? right! awesome video... everytime i watch this channel im reminded of the best flight of my life as a kid on a KLM 747 Canada to Greece via Holland...

[@selcukbirler6577]

The nicest dogs I’ve ever seen, what a lovely dogs...

[@FelipeFadini]

I like Mentour Pilot channel for two simple reasons: I can practice my English and I always learn something new, from a different point of view. Keep up the good fight and the good work!

[@jeffhoser7717]

If memory of several decades and many cabin hours serves some variants of early swept wing transports were particularly prone to this phenomona . The " stretched " DC-8 come first to mind but I've experienced 'Dutch Roll ' in Boeings as well. First hand I can attest it makes for an uncomfortable and tiring flight when your ' level bubbles ' are in a constant state of agitation ! A very good video and excellent explanation of the phenomona . Personal thanks from an old ' beast ' for an excellent channel ! FWIW, I've long held experiencing dutch roll in calm conditions back in the day may have resulted from some minor aircraft mis-rigging issues autopilot sensitivity conflicts . In today's digital world I would expect better .

[@DERP_Squad]

A Dutch Roll is a specific order in a Dutch 'coffee shop'.

[@tyrionlannister6769]

"Dutch Roll"....Euro version of Chinese Egg Roll...!

[@devilsoffspring5519]

@@tyrionlannister6769 I think he was talking about joints... not the kind on aircraft made with rivets, the kind you smoke :)

[@ChadDidNothingWrong]

Are they cooked in a Dutch Oven?

[@jamescollier3]

If you Google images, it is

[@canopyjunkie]

This applies to and explains things that happen to high performance parachutes, thanks for the thorough explanation, and now I have a name for it instead of "death wobbles"

[@patmurphy3410]

My experience with a Dutch Roll came from my tail dragger coach making me practice endlessly. Roll the wings back and forth and use the rudder to keep the nose in the same place on the horizon. Makes for improved rudder skills for sure.

[@Roholi]

Excellent video as always! I read that Pan Am had numerous Dutch Roll incidents when they first acquired their new 707s and since they were the launch carrier, their pilots had little experience with the effect. One story said the pilots turned green as they entered a severe Dutch Roll and every movement they performed only exacerbated it. I believe the yaw dampers were installed shortly after the 707 issues with Pan Am began and you can see the actual sensor that was installed at the forward base of the vertical stabilizer on the updated aircraft.

[@paulqueripel3493]

It already had a yaw damper (known as "Little Herbie" by Boeing). They'd known about the problem of Dutch Roll since the B47 prototype and an engineer called Ed Pfafman had created the damper. The 707 needed more hydraulic boost and a bigger tail. A Boeing pilot called Russel Baum was training a Braniff pilot on an early version when the roll got so bad the plane lost 3 engines,it crashed and killed 4 of the 8 on board.

[@Roholi]

Paul Queripel Great info Paul, thank you!

[@paulqueripel3493]

@@Roholi I had a quick look through "Wide Body" by Clive Irving. Not that much of an airplane buff to know that by heart. I did remember they first noticed it in the B47 as it was their first swept wing design.

[@HotelPapa100]

The translational movement due to the tilted wings is not a yaw, that's a side slip. Yawing (rotation about the vertical axis) comes as a reaction.

[@HotelPapa100]

@@acbulgin2 But he called the movement yaw. Which it isn't.

[@villiamo3861]

Absolutely. I love his videos, but this is a fundamental problem with this one - the sideslip is the very thing increasing the lift of the downwing compared to the upperwing. Any yaw in that direction amounts to near- coordination of the turn and even-ing the flow over the wings.(That yaw does happen with the consequential effects on the rudder etc, but it is hardly the thing increasing lift in the lower wing relative to the upper). I genuinely think it must have been Petter not concentrating with the use of the word 'yaw' - but it's a bit of a flaw!

[@AngelEditz123]

Brilliant presentation. Clear, concise, and really interesting.

[@evilchaosboy]

Just watched a video where the "Dutch Roll" was a problem and I KNEW what they were talking about! I never forgot "The skaters"! Thanks, Mentour! \m/

[@paulmurphy42]

Brilliant! Please do a video on how pilots at airports find the exact parking position, by using the lights on the stands, etc.

[@vigolivenca]

On this subject, you could do a video about adverse yaw and why do birds do not need a ruder.

[@TgSnowwy]

Yaw Damper: "I sense a disturbance in the Force... on the plane."

[@MentourPilot]

😂😂

[@chrisschack9716]

It's more a disturbance in the forces, isn't it?

[@pyrokinethic]

Master Yaw-da

[@kevinshen9391]

@@pyrokinethic Haha!

[@marcopohl4875]

gives a whole new meaning too skywalker

[@NazarDmytrovskiy]

I had tough time during ATPL with a Dutch roll. In case I will see you on my airline interview don’t be surprised if I use your words. P.S. Super easy explanation

[@brendannaylor8118]

It was very good of the dog to let Mentour appear on its show

[@RJ-rt1jp]

400 views in the first 5 minutes This channel is very successful!

[@mog882]

R J I came up with the term “feathered fish” while I was tripping on ketamine in a ketamine clinic. It just popped into my head, “my fine ‘feathered fish.” I thought it might’ve been a significant find so I did a web search for “feathered fish.” Now you know this.

[@roger1965100]

@@mog882 can i ask what you were at the clinic for? was it one of those controlled admissions of ketamine by a doctor for psychoanalytical reasons?

[@clintonandrews1538]

Dear Mentour: at 5:00 are you sure about the graphic? If the aircraft rolls right and yaws right, won't the air flow be coming from the left (the former straight forward path of the aircraft?) I enjoy your videos, including the non-verbal commentary of your co-pilot (the furry one.) All the best!

[@pawesawicki3237]

This episode was brilliant :D more about aerodynamics please!

[@DrPankajMalukar]

Thanks Mentour! Nice simplistic way of explaining Dutch roll. I believe on landing-on final, in a small aircraft where yaw dumper not available, if one tries to control Dutch roll can be worst & fatal. Enjoyed the video.

[@n6mz]

7:45 nice 777 animation. I'm sure my friend John Cashman (777 Project Pilot) got to disable the yaw damper and test the dutch roll tendencies of that beautiful a/c. Keep up the great work.

[@MrDentist89]

This is one of the best videos you have done so far.. I love those basic knowledge videos and i really like to have more of such contents.. Basic ATPL subjects and aerodynamics are really a great way to understand aviation as a science.. Thank you so much for this piece of information.. You are doing an absolutely fantastic videos😉😉

[@brunogasperin]

You are an inspiration for all of us who wants to become pilots! Thanks for another great video!

[@TheFukkyahh]

Thumbs up for the puppy ❤️

[@CristianKlein]

Finally got my wish fulfilled to have an episode about the yaw damper. Thanks @MentourPilot!

[@NicolaW72]

I´m watching it after the Southwest Incident on May 25th, 2024. Incredible that Petter had made a Video about it four years ago!🙂👍 - Btw.: I´m missing Patxi.🐈‍⬛

[@alessio272]

This is one of the reasons the FAA and icao has established the type rating requirement. Anytime I step in any high performance aircraft especially jets I always notice slight differences in the control characteristics of the aircraft in hand flying. Slight and smooth inputs are the key to preventing unstable flight. For those who have taking a checkride for private pilot and for additional ratings will notice a type rating checkride is typically 6 hours combined with the oral and flight portion. Any time the aircraft requires a minimum crew of two, the checkride will be conducted with a pilot flying and pilot monitoring.

[@RWAXDAHL]

Flew a lot back 88 to 95 from San Diego to Minneapolis. On one particular flight, on a Northwest Airbus I was seated in the back. The tail was going back and fourth, back and forth. I told the flight attendant I was getting sea sick. She mentioned yaw and offered a move to over the wing. I accepted and could not feel it at all. I still wondered when we would spin out of control.

[@fhuber7507]

Dutch roll is an interesting phenomenon that I run into often flying RC models. Its almost impossible to eliminate with the high power to weight ratio. There's almost always some flight condition that will get the tail wagging. I often get the tail wagging in the takeoff climb if I don't let the aircraft gain enough airspeed. If that is the only time it is seen, I stop trying to cure it through changing the design of the aircraft.

[@BillyKirbyUK]

The dog obviously has heard it all before and doesnt need to know more. Such a cool pup.

[@PPC4]

Erm sorry i'm a little confused, if the aircraft rolls to the right and imparts a right yaw moment (4:47) the incoming air would come from the left surely?

[@AsHu_Omni]

Absolutely correct. Relativity mechanics can be deceptive to most.

[@spoddie]

Warning I'm not an expert on aerodynamics: He missed or glossed over that when the aircraft rolls to the right it also does a right sideslip, it falls to the right, that's where the extra airflow comes from.

[@MatthijsvanDuin]

@@spoddie No he actually explained the mechanism that results in the sideslip to the right, but he then inexplicably called it yawing to the right.

[@MatthijsvanDuin]

To add, the sideslip does cause a yawing moment to the right, but this is a delayed result of the incoming air coming from the right (i.e.sideslipping to the right), not the cause of it.

[@elyas-tavakkoli]

This pilot 👨‍✈️ is very Friendly and I do like His videos , I have learned many things from this channel ! PLEASE KEEP IT UP 👍🏻

[@atwest]

Mentour Pilot dog anticipates roll to the left... smart dog!

[@dianneb2224]

I’ve heard of a Dutch Roll but never knew what it was. Now I do. And knowing why it’s called that helps to understand it. I learned something today.

[@JohnRodriguesPhotographer]

Learned about this reading about F100 and later I think the F4. Before the internet. Your explanation is more detailed and understandable.

[@fredharris4342]

Sheesh.... Petter - you are BRILLIANT! SO fascinating and educational - and EXPERTLY taught/explained. You're SUCH A BAD ASS!

[@SF-li9kh]

Beginning of the video: I already know all these End of the video: Woah, didn't know much. Learned a lot

[@mog882]

S F You are a good listener and a speedy learner, I am personally very proud of you. VERY proud.

[@SF-li9kh]

@@mog882 Welcome to Jumanji

[@MGTOW-nn9ls]

Hello Mentor Pilot. I love your videos and would like to ask the following question : How turn coordination on B737NG is done when autopilot is engaged. B737NG is two axis autopilot and deflection of the rudder is not controlled buy the FCC

[@lizardfirefighter110]

The pop up above the dog, “Why doesn’t he go into another room, I am trying to take a nap!”

[@rzarks]

lizardfirefighter110 I'm just glad it's one thing they didn't named black for whatever reason. Stay fly.

[@VulcanOnWheels]

Whenever you refer to a moment in a KZbin video, it's a good idea to include the time index. I usually do that at the start of the comment.

[@ChrisCupples]

Puppers are too cute 😍, and great vid 👍👍

[@carlosl5361]

Very good videos. Good job Mentour Pilot. You explain everything with clarity and in a very clear English. And you reinforce very adequately your explanations with examples, photos or other videos that I guess are laborious to find and edit.

[@AlielJorax]

This was the best video on the topic I found and you deserve my sub for this.

[@Gu1tarJohn]

Had never heard of this before. My first thought was some kind of aerodynamic feedback loop, but there's way more to it. Very cool. This channel rocks.

[@RosssRoyce]

The first thing they taught me about rolling on the small plane I fly is that simultaneously with the roll, the plane yaws AWAY from the direction of the roll. To compensate that on a turn they taught us to give a little of same rudder as the roll direction, only while rolling for the turn, not while holding the angle after. The prop plays into that too. Not sure about jets, they never attracted or interested me.

[@A423-f9o]

When the yaw-damper counteracts the yaw, what have you to do when landing in crosswind conditions? Would you turn it off? Or can you override it with your pedals? Your channel is great - many thanks for your effort!

[@FlyNAA]

Depends on the design of the yaw damper. Some you're supposed to turn it off for landing (and this is for all landings, doesn't depend on crosswind) some you leave on full time. I guess they're smart enough to distinguish between unintentional yawing, vs that caused by rudder pedal input.

[@A423-f9o]

@@FlyNAA Thank you very much for the answer!!!!

[@pirexengaer]

Quite good explanation but some technical inaccuracies/flaws to be improved: - Dutch roll doesn't occur just on sweptback wing a/c - As the disturbance kicks sideslip arises because the a/c tends to turn hence sideslip will develop (you mentioned "yaw" due to roll, which is not exactly the same) Nevertheless, congrats for this risky video, the end result was still very good I'd say.

[@ProfsrXav8r]

Good video and explanation. This is quite nitpicky and, honestly, I think most people probably consider the terms interchangeable. However, instead of referring the the three axes as pitch, roll and yaw; I would argue that those are motions, not axes. Pitch is a motion, caused by a moment of force about the lateral (or transverse) axis. Roll is a motion about the longitudinal axis and yaw is a motion about the normal axis. Also.... I know Mentour knows this (every pilot knows this) but I don't think he mentioned the term. The reaction causing an aircraft to yaw in the opposite direction of a turn (i.e. yaw left when rolling right) is called "adverse yaw." It is caused by a slight inclination of the lift vectors during the rolling motion, as well as by increased drag caused by the down-going aileron (down aileron is in a higher pressure area than the up aileron, causing a drag delta/imbalance and force moment about the normal axis.).

[@matthifalnil]

I remember on a plane me and the other kids/teenagers got to get it he cockpit at cruise. Then the copilot showed us how the yoke works by slightly taking it to right, and quickly back. That was super cool.

[@KronosIV]

This aerodynamics topic is extremely interesting (to me at least) and you explain it very, very well. Thank you, Mentour! Interestingly, my former flight instructor told me the origin of the term 'dutch roll' was a meat-filled spiral pastry from Holland, a shape similar to the directional line traced by the nose of the aircraft as it moved during the described motion. I wonder if any other American students have been told that?

[@donaldmason4959]

Nice to see Molly back!

[@xaaxzongo7867]

Thank you very much it’s so much clearer now. I have my ppl checkride coming and I was wondering if you could give me any advices as how to nail it. Or is there a book or a video that I can watch that will help me. By the way I got brilliant and it’s really good 👍 you guys should try it. It literally gamifies learning.

[@mcm933]

Thank you @Mentor Pilot, I just got my CPL last week and just I wanted to say thank you. ❤️

[@VulcanOnWheels]

8:49 Our country is actually called The Netherlands. The name Holland only refers to the westernmost provinces known in Dutch as Noord-Holland and Zuid-Holland.

[@reav3rtm]

Interestingly, in Polish, Netherlands is the most commonly called "Holandia" for some reason. And variants of "Holandia" are officially consistently used as all adjectives. So there is no "Dutch, Netherlands" like in English but "Holenderski, Holandia". Actually official form, "Królestwo Niderlandów" is so rarely used that even some government pages use non official (but the most frequently used) Holandia. Perhaps someone should send some diplomatic note to rectify that ;)

[@randomdriver]

I once became a sea sick while flying in the very back of the MD-90. The whole cruise phase it did this kind of a dutch roll motion. It was not very big motion, but I did feel it and did get almost to throwing up nauseated. I have flown with MD-90 many many times but only once it did that weird motion.

[@maverick24]

i was watching the dog while you were being a plane at 2:02 the big fluffy ear :D

[@poorboybmx2511]

Another great video, thank you very much, superbly explained and excellent graphics to accompany 👍

[@richc47us]

I'm not a pilot but understand the vector forces when it comes to changing course esp in an emergency on a boat in the water. Yes, there is no "Z" axis with a boat like there is with aircraft but similarly, there are momentum characteristics in play. Ideally, there is no immediate effect vectors with making left or right turns due to momentum effects. When I watch an aircraft or as a passenger, we don't notice these effects much but they do happen...You can notice it more when you see videos of landings with a crosswind.

[@jessijacobs8]

Incredible explanation 👏 👌 You put it across in such a simple easy way to understand. Thank you Petter!! 😊

[@scottjohnson8284]

I love that doggo does not care at all.

[@williamswenson5315]

I was unaware of the 707 crash, but I clearly remember the American 587 crash just outside NYC in 2001. Aggressive rudder input from the copilot in response to wake turbulence led to the separation of the vertical fin and the subsequent loss of the aircraft. Yes, pilots can break an aircraft in ways you don't always anticipate. The training for dealing with wake turbulence was changed in response to this accident.

[@pswooley]

Yes I had I flight over the Rockies that had a lot of that motion. I think we slowed down a little to reduce it.