Keeping MAX quiet - Chevrons.

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  • Claire Farron
    Claire Farron 6 दिन पहले

    very interesting, thank you

  • Andrew James
    Andrew James 7 दिन पहले +1

    Is that why fighter jets have more nose because there is little to no bypass

  • Andrew James
    Andrew James 7 दिन पहले +1

    Houses next to airports should be reserved for more committed aviation enthusiasts and pilots

  • vertik7
    vertik7 11 दिन पहले

    And still, the planes fly as slow as 50 years ago.

  • David Rigoni
    David Rigoni 12 दिन पहले

    Nice explanation What caught my attention was the camera angle on that jet taking off at the beginning . Looked like it was going straight vertical. All under seat carry on can now be found at the rear of the aircraft

  • Dmitry Kim
    Dmitry Kim 13 दिन पहले

    tyrant Pilot

  • Arturo Olvera
    Arturo Olvera 14 दिन पहले

    This is a great explanation, also gives a bit of insight into the complex balancing act that is aircraft design and aeronautical engineering.

  • Spanky Harland
    Spanky Harland 18 दिन पहले

    thanks for your informational videos- I am always learning something new in the aviation world because of you !

  • mark kcuf
    mark kcuf 23 दिन पहले

    This guy needs to take his own advice and take some English courses with a tutor. He talks like he's chewing on his tongue

  • White Mail Privilege
    White Mail Privilege 24 दिन पहले

    Your hand motions really help me understand the subject matter

  • Un Known
    Un Known 29 दिन पहले

    I've been kind of binge-watching your videos and have been really enjoying them. I love aircraft but, unfortunately, I have a terrible phobia where flying is concerned and so I never get to fly anymore. I used to love flying but I developed a phobia almost overnight, and for no particular reason. I have not flown since October 1984. However, that's a different story and not the reason for this comment. The advert you have concerning your sponsor mentioned English skills and there is something that I have noticed in quite a few of your videos. Now I can tell that you have an accent and that English is probably not your first language but I still wanted to point this out to you. Please don't be offended, I am just trying to help.
    The thing I have noticed is when you talk about a vortex. When you use the plural form you call them vortexes; this is incorrect. The correct word for the plural of vortex is 'vortices' (pronounced vor-ti-ceez), not vortexes. It's like the word 'index; the plural of index is indices (pronounced in-di-ceez), not indexes. I have seen and heard both vortexes and indexes used but that seems to come from Americans and we all know what they are doing to the English language. :p
    Anyway, this comment isn't meant to have a go at you or to troll you, it's purely to help you with the correct use of English (as opposed to American-English) so please don't take it the wrong way. Okay, now I am going back to watching your videos. :)

  • Cilok 8108
    Cilok 8108 महीने पहले


  • Jay Nolan
    Jay Nolan महीने पहले

    I guess this would be the same pros and cons for military aircraft. Possible stealth application? But less thrust. When it all boils down in war and saving your ass or your comrades. I could care less about ppl being disturbed by my engines. Does the B-2 use something similar?

  • Red Rooster
    Red Rooster महीने पहले

    Its sad that we get less aerodynamics and less safe all because people are too damn sensitive to noise. If you dont like the sound dont live so damn close to the airport.

  • Yosef MacGruber
    Yosef MacGruber महीने पहले

    Use anti-gravity wave propulsion, like on _The Jetsons_ futuristic cartoon. Produces the least amount of noisy vortexes.

  • Chandan Kishore Chutia
    Chandan Kishore Chutia महीने पहले

    Thanks for this video. I was too confused when Rolls-Royce introduced these structured engine as the more efficient one. I was aware of it's decreased aerodynamics which is not at good for fuel economy? ..... It's turns out that your heavy sound insulators were the missing link that cause my confusion.

  • Bradley Pool
    Bradley Pool महीने पहले

    Just a quick question, what jet aircraft has three big steady white lights underneath and a flashing red light right in the middle underneath?
    It flew right overhead tonight in the middle of the night, very slow with a low fairly quiet jet noise and about less than a kilometre high, it seemed quite close to the ground and only moving very slowly.
    The white lights were in a straight line underneath adjacent to direction of travel and the big red light flashing next to the middle light. I'm not sure if I could make out the red and green right /left lights usually on the wing-tips and there weren't any of the white strobe lights you usually see. I couldn't see its shape in the dark, just the lights.
    There's no airports close to my location, only about 6-7 kilometres away on the other side of the rural city where I live. But it was flying west to east and not towards or away from the airport. That's south of my location. It disappeared slowly in the east.
    I'd love to know what kind of aircraft it was because it was so different with that low toned jet noise that seemed uncharacteristically quiet for something that seemed so low to the ground. Plus it was a dead calm night and almost clear sky apart from some high cloud cirrus.
    Are there any aircraft that have this light configuration underneath because I was starting to think I was seeing a ufo???
    I've seen heaps of jets at night and they always seem the same with flashing strobe lights and green and red directional lights but I've never struck the big red light flashing every second on the underside right in the middle between two big white lights. And by big I mean they seemed to have a large surface area like the actual lights were large and bright but not blinding so much that you couldn't make them out. They were easy to look at the red light was the brightest of them all and the last light to disappear in the eastern sky. The white lights were steady only the red one flashed about every second.

  • Silas Eat
    Silas Eat महीने पहले

    Did anybody else see that quite steeped takeoff in 1:00? Ma man...

  • Mr. Meow Meow
    Mr. Meow Meow महीने पहले

    Also new Russian airplane and Chinese plane have same look . I wondered why ... ty for info .

  • John Sikes
    John Sikes महीने पहले

    I'm not picking on you at all since you are multi-lingual, and I'm not, but just FYI, I think the plural of vortex is vortices. I really enjoy your videos, keep 'em coming. ;-)

  • Simon Coles
    Simon Coles महीने पहले

    technically a jet engine creates a low pressure region inside into which air is pushed...

  • assmatronix
    assmatronix महीने पहले

    Hey, I love your videos and looking forward to each new video. But can you tackle the "no fuel hoaxers" that sadly are growing these days? People who think jet airliners don't run on fuel, but instead use compressed air for propulsion. I'm pretty familiar with most parts of aviation and really don't need a detailed explanation why this conspiracy theory is ridiculous, but it would be fantastic if you could lay it out for people so that fewer and fewer jump on this silly bandwagon.

  • ian davies
    ian davies महीने पहले

    Would these vortexes have a similar effect that cavitation has on pumps?

  • Carmel Pule'
    Carmel Pule' महीने पहले

    Those chevrons, on each triangle they create opposite rotating vortexes which subtract their effect and whose axis are parallel to the axis of the engine. ( related to, but not exactly like wing vortex generators)
    Without them the vortex axis is at right angle to the axis of the engines, parallel to the last exhaust rim . ( similar to the vortex at the trailing edge of a wing)
    To "see" the effect get a water hose pipe and cut it at right angles and see how the emerging water flow behaves. Then cut the end of the hose at a slanted angle and see how much smoother and laminar the output water flows.

  • cesteres
    cesteres महीने पहले


  • Insects Inside
    Insects Inside महीने पहले

    Luckily, I already knew what this formation w
    As for but I gave you the view anyways just because u deserve it and I like watching

  • 12 flags
    12 flags 2 महीने पहले

    What kind of aeroplane do you fly?

  • Matthews Jose
    Matthews Jose 2 महीने पहले +1

    Hi could you tell me if an aeroplane flies if it is upside-down. Do you train for that sort of senarios. Thanks.

    • Matthews Jose
      Matthews Jose 2 महीने पहले

      +Mentour Pilot you have a video on that if I may ask, of a plane being flown upside-down. Thanks :)

    • Mentour Pilot
      Mentour Pilot  2 महीने पहले +1

      Yes it does and we do practice “upset” maneuvers

  • chicagoman58
    chicagoman58 2 महीने पहले

    Great video! The old 707 and DC-8 turbojets were even louder than the 727.

  • kemi242
    kemi242 2 महीने पहले

    I admit that, it makes the 787 look even more beautiful, but if that really reduces noise, I wonder why Airbus didn't catch up with this. Is this patented, or did they found other ways to reduce noise?

  • jamesread11
    jamesread11 2 महीने पहले

    I heard these were inspired by bird wings (they have had some evolution to get it right) if you look at wing trailing edges with the shape of feathers looks likes the chevrons and they are looking at putting them on plane trailing edges too

  • Scott Wood
    Scott Wood 2 महीने पहले

    Do the chevrons also have an effect on wake turbulence?

  • Slyze33
    Slyze33 2 महीने पहले

    What if the cold air were accelerated even more, would that reduce noise?

  • JetMech 777
    JetMech 777 3 महीने पहले

    Another solution to the noise pollution problem if for whinny bitches to move away from the airport. If you live around an airport you’d better expect noise. If you don’t you’re retarded, and should not reproduce.

  • Richard Daniels
    Richard Daniels 3 महीने पहले

    Maybe you can answer a question for me or another person in this comments section can answer this. I was told that several years ago that around certain large city's in the United States such as Dallas Texas when a aircraft got ready to take off after a certain time of evening until a certain time of morning they where restricted to only being able to take off at half power. Can anyone confirm or deny that this was and it is still the case?

  • Roland VIDAL
    Roland VIDAL 3 महीने पहले

    Great explanation !
    They treated the problem at the source.

  • nakebuckaroobob
    nakebuckaroobob 3 महीने पहले

    Why are commercial plane manufacturers not using some sort of THRUST VECTORING ?

  • Melanie Ortiz
    Melanie Ortiz 3 महीने पहले

    I'll be flying to Paris on a Norwegian Air Boeing 787 Dreamliner next month, and I've noticed the chevrons in plane spotting videos and wondered what those jagged edges were. I'm hoping that the lower noise level will make it easier for me to sleep on the plane, especially since my flight is over 10 hours and I have to deal with a 9-hour time change.

  • Ace Lightning
    Ace Lightning 3 महीने पहले

    They look like something out of Star Wars or Firefly ;-)

  • aabaa aabaaa
    aabaa aabaaa 3 महीने पहले

    While the mechanics are probably different, this reminds me of the effect a silencer has on a gun. Where airflow is slowed down on a jet engine, bullet speed is slowed down using a silencer. And of course, less noise.

  • aabaa aabaaa
    aabaa aabaaa 3 महीने पहले

    Learning English isn't just good for being an airline pilot. English is now the language of the World. It's used for business, diplomacy, science, and everything else. If two non-English speakers need to communicate with each other, they will invariably use English as the common language. Taiwan has just announced that they will adopt English as an official language.

  • Robert G Gee Boggs, Jr.
    Robert G Gee Boggs, Jr. 3 महीने पहले

    Another clearly explained engineering/physics concept. This man is amazing.

  • daemu
    daemu 3 महीने पहले

    Yeah im from Zürich its in the video

  • Lord Zeleathos
    Lord Zeleathos 3 महीने पहले

    I don't understand why one would complain about noise when you move by an airport...

  • Bruce Denning
    Bruce Denning 3 महीने पहले

    I appreciate your very comprehensive explanation of the chevrons and other topics. Keep it up!

  • Patrick Jeanjean
    Patrick Jeanjean 3 महीने पहले

    Great video ! What website is shown at 5:02 ?

  • ARRUE Ricardo
    ARRUE Ricardo 3 महीने पहले

    Nice Congratulations Mentour Pilot

  • Ted Shredz
    Ted Shredz 3 महीने पहले

    Nicely done!

  • furzkram
    furzkram 3 महीने पहले

    Avail_i_ble ???

  • Khalil Assaad
    Khalil Assaad 3 महीने पहले

    thanks , your videos are very very good, you have a good way to explain

  • Rob Villegas
    Rob Villegas 3 महीने पहले

    I love your videos Captain!

  • John Doyle
    John Doyle 3 महीने पहले

    Thanks, I enjoyed the explanation, so a slight loss in efficiency of the engine, is compensated by a reduction in sound insulation weight material on the aircraft, with an overall increase in efficiency and reduction in noise, sounds like a win, win.

  • Frank Reading
    Frank Reading 3 महीने पहले

    Just an FYI, sir: The plural of vortexes, at least in English, is vortices.

  • Atom Baxter
    Atom Baxter 3 महीने पहले

    Great video 👍

  • the_punnisher
    the_punnisher 3 महीने पहले

    Why not use use the same setup used in noise canceling headphones? Move the transducer opposite the engine made pressure wave to stop the noise generated by an engine? The airframe industries could specify this now that NEXTGEN has become standard and people are complaining about noise even more.

  • abdel belhadj
    abdel belhadj 3 महीने पहले

    very instructive thanks captain

  • HornetVF103
    HornetVF103 3 महीने पहले

    You will also notice that the chevrons are offset from bypass air to thrust air. The vortexes that are created are designed to help cancel each out. Similar to noise cancelling headphones.

  • ebiros2
    ebiros2 3 महीने पहले

    Dude, you're too long winded

  • Jeroen Jansen
    Jeroen Jansen 3 महीने पहले

    He explains it very clearly without the usual useless words we normally hear

  • David Weber
    David Weber 3 महीने पहले

    Always with an absolutely fantastic explanation. Thank you!

  • Clark Kent
    Clark Kent 3 महीने पहले

    LOL. You know NOTHING of jet engines but what u were taught, no offense!!! An electro-magnet is a better comparison. The vortex gennies are rolling the noise bending the sound waves

  • Clark Kent
    Clark Kent 3 महीने पहले

    Chevrons are actually vortex generators for distance efficiency

  • Elliott Henderson
    Elliott Henderson 4 महीने पहले

    That's why I love camping at Download Festival. The campsite is right near East Midlands Airport runway. Early morning rush is a great wake-up call!

  • Ben Huot
    Ben Huot 4 महीने पहले

    Super video like always. You should hae talk about one of the quieter engine/airplane in the world tday, the Bombardier C-Series, sadly now an Airbus 200 series.

  • Matt Houston
    Matt Houston 4 महीने पहले

    Very interesting videos, but, especially as you advertise English courses, do check up on the construction of the second conditional in English - it's "if it were to happen", or "if it happened", or "should it happen", but NOT "if it would happen". This is a common mistake that the Americans are introducing into English so you're not alone!

  • Billy Bob
    Billy Bob 4 महीने पहले

    Its not a "controlled explosion", its actually a "controlled combustion", an explosion (no water how well controlled) would damage the engine or give the passengers an uncomfortable ride with all those sudden, high energy pulses. LOL

  • George Cole
    George Cole 4 महीने पहले

    The chevrons are part of the fan exit not the exhaust also 80% + of the thrust comes from the N1 fan rotor

    • FromNorway
      FromNorway 4 महीने पहले

      If you pause at 1:40 you will note that there are chevrons on both the fan exit and exhaust exit.

  • Anvilshock
    Anvilshock 4 महीने पहले

    2:48 Did somebody actually manage to put the jet engine core back to front into the housing there to create this animation??

  • Bad Informeiyon
    Bad Informeiyon 4 महीने पहले

    They look absolutely awesome, the same as the new winglets.

  • Steven Paul Jobs
    Steven Paul Jobs 4 महीने पहले

    What is the website that shows those jet engine noise on map?

  • Lancair W
    Lancair W 4 महीने पहले

    I fly the CRJ 900 and it seems it was one of the first aircraft I noticed to have chevrons. Ours is on the exhaust cone at the rear of the engine. I haven’t noticed this on other aircraft??

  • alexnefi
    alexnefi 4 महीने पहले

    What's the website you used at 5:01 ?

  • Deshwitus
    Deshwitus 4 महीने पहले

    7:00 Kloten! :-D
    on the left Side you see our Village, Buchs ;-)

  • Buddy Clem
    Buddy Clem 4 महीने पहले

    Great video, and a perfect choice of sponsor! I especially enjoyed the technical drawings and explanations.

    SHOW DESIGN GROUP 4 महीने पहले

    What is Chevrons ?! An Company who sell "jet fuel". Society sonsor you as well

    SHOW DESIGN GROUP 4 महीने पहले

    It is just air noise. Forget the fuel . You are just idiot!

  • Eric Severn
    Eric Severn 4 महीने पहले

    (Love these videos.) You said that the chevrons reduce the volume of the engines but they increase drag but the less noise means that they can remove some of the sound insulation to lighten the aeroplane and lessen or eliminate the loss of speed (or aerodynamic efficiency) due to the increased drag. Okay, so this reduces the noise outside of the aeroplane. One issue I have with flying is the amount of noise inside the cabin. It’s high (probably because I’m usually behind the engines in the cheap seats). Having ear damage (from something else), I’m weary of having any more, so I’ve tried noise isolating ear-buds (no such thing) and noise cancelling ear-buds (noticeable but minimal) and I’m about to try noise reduction ear muffs, but I wonder about the flight attendants. How is their hearing? Have tests been made? Statistics collected? Wouldn’t they (and we) benefit from leaving that insulation in the walls?

  • Chris Doc
    Chris Doc 4 महीने पहले

    The plural of vortex can be either vortexes or vortices. As a native English speaker vortices just sounds better. Love your informative videos.

  • Valentin Reiter
    Valentin Reiter 4 महीने पहले

    patch abroad french liberty defendant beer dance horror box usual.

  • Can Aral
    Can Aral 4 महीने पहले

    Sir, this video is spectucular. Thanks and best regards.

  • FUBAR Garage7051
    FUBAR Garage7051 4 महीने पहले

    So ,correct me if I'm wrong, but it sounds like in a perfect world seeing ,that air is a fluid, you would need an engine output capable of creating laminar flow to maximize noise reduction as well as thrust?

  • TheLusus
    TheLusus 4 महीने पहले

    I think this effect where discovered from studying owls, the scientist woundered how owls could fly so silent.

  • adnanramuk
    adnanramuk 4 महीने पहले

    pleural of vortex is vortices not vortexes

  • Good Boy
    Good Boy 4 महीने पहले

    Great video. But slow. I watched at 1.5 speed.

  • WatDaMattaForYou
    WatDaMattaForYou 4 महीने पहले

    The chevrons would look like rockets if they would paint flames along the edges.

  • FS9 MadDog Driver
    FS9 MadDog Driver 4 महीने पहले

    The 787 version of these engines puts out almost 10:1 bypass ratio, which is, in and of itself, fairly quiet, compared to the rest (747-8 version puts out 8.6:1). The chevrons help quite a bit with the rest. But the one noise you cannot mistake is the buzzing sound the '87 engines make on descent near flight idle. It is tell-tale of the 787 or 747-8, and I rather enjoy it.
    In the midsummer of 2012, I was off I-5 near Stanwood, WA, tanking up and heard a 787 approaching overhead: looking up, the plane was flying very hot, on base for a long final into KPAE's Runway 16R, its #1 engine trailing a thin grey/brown smoke, ejecting an occasional particle. The engine was blown, the plane made it safely in, of course.

  • onecheman
    onecheman 4 महीने पहले

    I remember my first time hearing the vortex noises... It was at night, and I looking into the sky like a fool asking "where are those fighters jets?" I thik about it today ant its funny hehe.

  • erastus piusa
    erastus piusa 4 महीने पहले

    hi mentour pilot nice video but can you make a video about the differences between jet engines like turbo jet,turbo prop,turbo fan and turbo shaft engines as well please

  • starset Moonrise
    starset Moonrise 4 महीने पहले +1

    I think they look like cookie cutters

  • sridhar p
    sridhar p 4 महीने पहले


  • Henri Hämäläinen
    Henri Hämäläinen 4 महीने पहले

    In recent years some F1 teams have added serrations to back edges of some wing elements. The reasoning has been that with those they can create controlled mini-vortexes with which they minimize the vortex created by the wing. That way they can lessen the amount of total drag at high speeds. Those serratiosn don´t work on all wing setups so they are there only on certain tracks and certain cars.
    In both cases (jet engine and car) it is all about controlling the airflow although for different reasons.

  • Two Bins
    Two Bins 4 महीने पहले

    Has anyone ever told you that you have a tinge of Irish in your accent?

  • Have Fun
    Have Fun 4 महीने पहले

    Here's a very good way to control the noise complaints from people living near airports...
    Don't allow housing to be built close to an airport!
    Every New airport that's built, it's just right away they start building houses all around it... then complaints start flying.... Form a no build boundary around it that allows for the planes to perform their takeoff and landings efficiently without molestation.

  • David Farmer
    David Farmer 4 महीने पहले

    I saw a video of a 737-800 NG of a night landing at LAX. It had a HUD, when did 737's get HUDs?

  • Michael Williams
    Michael Williams 4 महीने पहले

    The pronunciation of the English language depends upon at which end of the island you were reared! (unless your parents moved)

  • Einzee
    Einzee 4 महीने पहले

    The bottom line is, we need aircraft. Those that complain of noise should have chosen a different place to conduct business or live. Id be willing to bet that those that complain the most probably cannot afford to ride on an aircraft anyways. Nice video tho! Thank you for your informative video series.

  • Indrid Cold
    Indrid Cold 4 महीने पहले

    I added similar structures to a lightbar I purchased for my aging Jeep. It went from a roaring howl when I got on the motorway to a gentle breeze sound. The noise was from the lightbar cutting through the air and the flat windshield behind it. It works!

  • biggy5567
    biggy5567 4 महीने पहले

    Another fantastic video! Very well explained!

  • RumikoOne
    RumikoOne 4 महीने पहले

    I just love the fact that every time a loud plane like the 727 flies over, it makes a snowflake cry. The snowflake will win in the end, though. As they do with everything.

  • Clifford Nelson
    Clifford Nelson 4 महीने पहले

    Interesting the efficiency and noise improvements. Makes me think about why a golf ball had indentations. Maybe one day airplane skins will have bumps also.