Coffin Corner Explained!

Today we look at what happens at the upper limit of the A320's flight envelope, the dreaded coffin corner!
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I am a real world Airbus pilot with thousands of hours flying the real aircraft and thought it would be fun to have a look at the detailed simulations of the 'bus in MSFS and X Plane 11. Hopefully you find this useful and it brings another perspective to your simulation. Any thoughts or comments are welcome!
This video is intended for home entertainment only and does not reflect or represent any real world aircraft or airline procedures. It is for home flight simulator enthusiasts only and has no real world application. All views expressed are my own.

[@320SimPilot]

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[@birdman4274]

20:20 When you said 1st Officer not happy and I heard the sound, I thought Fenix had done an update and that was the warning sound 🤣

[@txhunter144]

That was great. I’d never heard of coffin corner before but that makes perfect sense. You explained it well.

[@JohnVanderbeck]

Supersonic flight is fascinating from many angles, but what I really find fascinating is that the biggest challenge to supersonic flight was actually the TRANSonic regime, that is the transition from subsonic to supersonic, and the opposite. That was one of the hardest things to figure out.

[@jjsmallpiece9234]

SO basically you need to kick the passengers out, the higher you go.

[@peterfour]

"Alright passing FL390 now, Row 1 through 8 you're out"

[@rickwilcox5131]

other option would be to dump fuel. Neither option is very nice 🤣

[@ajfurnari2448]

@@rickwilcox5131 Cargo. Nothing like a FL390 garage sale/fashion show

[@rickwilcox5131]

@@ajfurnari2448 🤣

[@devansh8846]

You got it👍🏻

[@Rabid747]

It's ok the First Officer always seems to land on his/her feet

[@devintariel3769]

I've been pulling back on the stick the whole time

[@ericohara2582]

I’m glad you have shown this, I have often relayed to friends about coffin corner from my introduction in CPL training. But I get the “yeah right” look from them! From memory, there have been serious testing issues on aircraft with high tails like VC 10 and Trident etc. I think we were given report sheets to read through but that was 30 yrs ago so I can’t quite remember the details. On losing elevator authority from the shock wave pressure movement, I am sure I read an account of even lowering undercarriage to cause a downward pitch change from the shift of the drag centre line. Thank you..

[@noortmanen]

Love the videos. They helped me get into flight simming, keep it up

[@tyson2496]

So many dependencies on dynamic pressure, and how at Mach numbers above about .30, compressibility effects on dynamic pressure impact things like lift and drag. Great video.

[@noobmusician3091]

Very helpful video, helps a lot with my flight sim experiences.

[@czechplastik]

That was fascinating. Thank you.

[@KyrilPG]

20:10 and 20:18 is that a goat I hear in the background ? 🤣 Amazing video, great explanation : perfect ! This is really informative and well done. You really are one of the best channels to understand and learn aviation, piloting and Airbus systems. Thanks a lot ! Smoosh smoosh to the first officer. 😘

[@Erny_Module]

Another excellent and informative video, and especially appreciate the demo of what happens as you approach it. I seem to recall reading the the U-2 spyplane spends much of its flight at Coffin Corner, due to the extreme altitude it operates at. BTW - I think Pilot Monitoring needs changing or feeding!

[@What_If_We_Tried]

Your informative videos are much appreciated.

[@chrisshawofficial]

really really good video, learnt me a few things!

[@ytska6219]

Very interesting and explained very well. Good job as always ….. Thanks

[@HRCISASKNK]

Excellent video and explanation.

[@magnumgrp1]

So how does one get out of coffin corner? Wait for fuel burn to bring the weight down?

[@siddharthsharma8940]

I read/heard about coffin corner when I read the Lockheed "Skunkworks" book, where they mentioned it was a huge problem with the Lockheed U2 spy plane

[@marc-antoinemetivier2854]

Scary sight indeed!

[@essbe7158]

Thank you. great video.

[@tomstravels520]

Are you going to try the latest ToLiss A321 XP12 update? Pull a few circuit breakers lol

[@christopheratkinson1690]

Really Interesting great informative video. I like a good Buffet as much as the next man but not a Mach Buffet😊👍

[@samey8960]

Could I ask if you have used FSRealistic? And if so which settings you used to get the right vibrations, touch down jolts etc?

[@peterlazuric5641]

Great video. I must have missed it though. Once you find yourself in the coffin corner how would you get out of it? Would you just descend to a lower altitude or what?

[@dalebachman2892]

Thank you so much for explaining the coffin corner concept but I do have a question. If the aircraft is getting it’s airspeed from the air going into the pito tube and the air gets thinner the higher you go, How does aircraft determine the mach speed, ground speed and true air speed?

[@GI_Jew]

Would the flex change in a certain part in this scenario

[@adityasingh1051]

Hi, can we make a turn or manoeuvre the aircraft when flying at the Coffin Corner?

[@finnmoller638]

Cool

[@Kelpli]

W video

[@IamJimhunder]

Would the VLS creep up in a turn? Since the inboard wing will experience a lower airspeed than the outboard wing in a turn? Similarly, would the outboard wing stall? How does the Airbus protect the aircraft in this situation?

[@jjsmallpiece9234]

Yes, because the lift vector reduces as you turn the aircraft. So if lift goes down, more speed is required to compensate. Remember Lift (force) = 1/2 ro S Cl

[@tomstravels520]

I don’t think so because VLS is based off the stall speed of the aircraft at its current weight. Alpha Prot and Alpha Max would creep up but VLS (like green dot) are characteristic speeds

[@ejb1992]

xplane 12 and tolis 321 NEO?

[@x10nd]

How do you get terrain info on the navfd? I use FBW and dont have it

[@ghostfa4449]

you need the experimental version of the A32NX and SimBridge installed

[@Robmlufc]

How would you pre plan for cruise altitude for the flight plan? I guess there is a weight/altitude chart or calculator so you don't prefile for 380 and then end up having to request 340, for example?

[@budguy21]

Flight Dispatchers do all the planning

[@Robmlufc]

@@budguy21 makes sense! I know there's a "plan step climbs" button on simbrief but not sure if it really works. Would ATC be aware of any planned step climbs?

[@budguy21]

@@Robmlufc it does work. Simbrief will even tell you at which waypoint to change your altitude, but you have to look for it in the flight plan, its easy to miss. Not sure if ATC would be aware of them, but as pilot you just ask for the altitude change at the appropriate time.

[@Robmlufc]

@@budguy21 Cheers Mike, good info. I'll give it a go.

[@zacherius137]

16:25 AF447 wished you published this video a decade ago.

[@itts]

Hey, I'd still love to get your input sometime (maybe a video about it) about what rudder pedal sensitivity setting to use, or that you're using, to make the Fenix A320 (or any of the mods, I suppose (in msfs)), "feel" most realistic to the actual aircraft. I know, I know, there are many different rudder pedals, etc, but the "standard" sensitivity setting just seems wayyyy too sensitive. Would love your input on this.

[@budguy21]

you answered your own question: too many variables

[@pu11.__23]

What are those small display over the mcdu?

[@braindeadlogan230]

DCDU, (Datalink control and display unit) used mostly for datalink between controllers and pilots, sort of like a text message

[@leonpilot737]

DCDUs

[@pu11.__23]

@@leonpilot737 thnx

[@Seventh7Art]

Overspeed.....stall, stall......overspeed.....stall, stall.

[@aspecreviews]

Qantas 72...

[@johnarmstrong3782]

Does the First Officer work for Ryanair?😀

[@dgonL]

4:42 The speed of sound is only dependent on the temperature to my knowledge.

[@bltzcstrnx]

Pressure/density play an important role, just like any other waves in any other mediums.

[@dgonL]

@@bltzcstrnx Yes and no. If you consider air as an ideal gas, then the speed of sound is sqrt(kappa*r*T). Pressure and density are related to the temperature by the ideal gas law p=rho*r*T, but only the temperature is required to find the speed of sound.

[@bltzcstrnx]

@@dgonL why water that have the same temperature as air differ in speed of sound? Both are categorized as fluid and can have varying density (salt water is denser for example). Also it's density that seperates water and air at the same temperature.

[@dgonL]

@@bltzcstrnx There are two reasons for this. First of all the formula "speed of sound = sqrt(kappa*r*T)" has kappa and r. These two values change if the fluid changes. So for air they're always the same (kappa = 1.4 and r=287), but water has different values. Secondly, air can be approximated as an ideal gas (truely ideal gases don't exist, but air is very close), water (or steam) on the other hand is not an ideal gas at all. What I'm saying is that, as long as the fluid stays the same, the temperature alone is enough to determine the speed of sound.

[@coriscotupi]

@@dgonL Bingo.

[@ejb1992]

is this xplane 12?

[@budguy21]

He literally says in the beggining its the Fenix, which is MSFS

[@ejb1992]

@@budguy21 missed that. thanks mike p

[@hotaruchiyuki7711]

It would be more interesting to watch your aircraft experience a turbulence and see what would happen to it.