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Airbus Takeoff Engine "Roar": Why?  
User currently offlineAguilo From United States of America, joined Apr 2004, 243 posts, RR: 0
Posted (10 years 1 week 6 days 3 hours ago) and read 11231 times:

Anyone ever notice on how Airbuses there is always this very "rough sounding" roar on takeoff as if the engines are going to self destruct any second? What is the reason for this?

Only occasionally hear it on a B737 (probably when they are using full power for takeoff) but never hear this sound (kind of like the sound a 4 cylinder car would make if you were steadily redlining the engine) on another Boeing, ERJ or CRJ aircraft.

Any explanation?

62 replies: All unread, showing first 25:
 
User currently offlineAircadet From , joined Dec 1969, posts, RR:
Reply 1, posted (10 years 1 week 6 days 2 hours ago) and read 11087 times:

Most of my travels are on Airbuses 319-320-321 and occasionally on 737's but don't recall ever hearing such noises, The airbus if anything whines a lot and the 737 seems to have more of a grawl.
Which airbuses were they.?


User currently offlineQ330 From Australia, joined Dec 2003, 1460 posts, RR: 22
Reply 2, posted (10 years 1 week 6 days 2 hours ago) and read 11070 times:

Which airbuses do you hear this on?

-Q



Long live the A330!
User currently offlineAndreas From Germany, joined Oct 2001, 6104 posts, RR: 32
Reply 3, posted (10 years 1 week 6 days 2 hours ago) and read 10975 times:

It's always a pleasure to see new and exciting forms of Airbus-bashing, innovative...and ultimately as nonsensical and useless as all forms of A (or B) bashing.

Well I never ever noticed such a noise, neither on B nor on A, but then I rarely fly Airbus...only about 150 times per year, throw in another 100 Boeing flights, so I don't really qualify to judge such "whiny, redlining, itsy-bitsy plastic" noises, which are produced, btw, by the engines, and afaik, Airbus does not manufacture any engines, neither does Boeing!


Mods...can we stop this please?  Angry



I know it's only VfB but I like it!
User currently offlineBestWestern From Hong Kong, joined Sep 2000, 6953 posts, RR: 57
Reply 4, posted (10 years 1 week 6 days 1 hour ago) and read 10873 times:

Wondering if that roaring noise on Airbus frightened US UA and AC customers away and caused their CH-11?  Smile  Smile Maybe we have found the source of their problems.

Sometimes I really dispair at this site... I think Civil Aviation needs to be split in two...

1. aircraft related questions (what airline flew you first on a 777, etc...)
2. airline related questions (why is Ryanair so cheap?)



The world is really getting smaller these days
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 5, posted (10 years 1 week 6 days 1 hour ago) and read 10853 times:

The roar is the result of thrust, which in turn creates lift. I'll take the roar over standing still at the gate Big grin

I think that Aguilo is referring to the "buzz-saw" sound. Many modern engines sound like that.




"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineUdo From , joined Dec 1969, posts, RR:
Reply 6, posted (10 years 1 week 6 days 1 hour ago) and read 10844 times:

Oh, now I see who suggested my posting for deletion...heroic action, but why not use some glasses which might help to see smileys?  Wink/being sarcastic

Btw, I know what sound is meant by Aquilo. My impression is that CFM-equipped A320s produce that sound more intensively than IAE-ones.


Regards
Udo


User currently offlinePelican From Germany, joined Apr 2004, 2531 posts, RR: 8
Reply 7, posted (10 years 1 week 6 days 1 hour ago) and read 10836 times:

Just in case this isn't a new try to bash Airbus I want to add that I have also heard something...
I wouldn't describe it as a rough roar but there is definitely in front of the engines of an A 32x a specific noise which I haven't heard in a 737NG.
The first time I heard it was when I sat in front of the engines in (~7th row) an Aer Lingus A321.
But on the other hand I have noticed that 737NGs are much louder behind the engines.




User currently offlineAircadet From , joined Dec 1969, posts, RR:
Reply 8, posted (10 years 1 week 6 days 1 hour ago) and read 10821 times:

People please, chill out, have a coke and a smile  Smile
It's a forum if you don't like whats being discussed don't reply or comment.

If i see something which sounds the same(ryan air / B or A/ WHIC 777/330 etc I just switch topic).

Come on guys  Smokin cool


User currently offlineAndreas From Germany, joined Oct 2001, 6104 posts, RR: 32
Reply 9, posted (10 years 1 week 6 days 1 hour ago) and read 10794 times:

Just to avoid misunderstandings: I did suggest deletion of THE WHOLE THREAD, not a single post, and I said it openly in my first post here. Other than that, I really do not care about who posts what, but in this case, I had the pre-easterly egg-finding urge to point out the rather A-bashing nature of the thread per se  Big grin.

btw: as can be seen, I do know how to use smilies, so don't jump to conclusions, angry young man  Smile


Ignore threads? I do that most of the time, but not if it's against a clear regulation of the Forum, and A vs. B is such a regulation!

And btw: I didn't say it was a seen-it-all, on the contrary, it's rather innovative Big grin

Happy holidays!

[Edited 2004-04-07 13:05:42]


I know it's only VfB but I like it!
User currently offlineSolnabo From Sweden, joined Jan 2008, 847 posts, RR: 2
Reply 10, posted (10 years 1 week 6 days 1 hour ago) and read 10782 times:

Maybe Airbuses roar due to RR/GE´s/ CFM, but have you heard a 737-200 taking off? Puuhleeeze.......
A smaller earthquake IMO!
Sorry, dont drink Coke/Pepsicrap, only Ramlösa or Avignon for me  Smokin cool

Michael//SE



Airbus SAS - Love them both
User currently offlineUdo From , joined Dec 1969, posts, RR:
Reply 11, posted (10 years 1 week 6 days 1 hour ago) and read 10735 times:

Did I address anyone specific? Sorry, cannot remember...that's probably caused by reduced pre-easterly food consume...  Wink/being sarcastic


Regards
Udo


User currently offlinePelican From Germany, joined Apr 2004, 2531 posts, RR: 8
Reply 12, posted (10 years 1 week 6 days 1 hour ago) and read 10734 times:

I think Udo is right about the CFMs - I never heard the "buzz-saw" sound in a BA A 319-131...



User currently offlineJGPH1A From , joined Dec 1969, posts, RR:
Reply 13, posted (10 years 1 week 6 days 1 hour ago) and read 10693 times:

This thread is not Airbus bashing - for some reason, I have noticed that there is a very distinctive low pitched noise when many Airbus aircraft take off - it is most peculiar. I noticed it on Sunday, watching an AF A321 take off at NCE. It sounded very different to the Easyjet 73G that had taken off before. It is not just Airbus narrowbodies either, AB3's have it too. It must obviously be some feature of the engines these aircraft carry, but it is definitely there.

P.S. I am most definitely pro-Airbus, this is not a criticism, just an observation.


User currently offlineVSGirl From , joined Dec 1969, posts, RR:
Reply 14, posted (10 years 1 week 6 days 1 hour ago) and read 10677 times:

On the baby buses I always find there is more of a wine at take off... I am normally in Business which is just in front of the engines, sometimes just in front of the wing or on top of the wing the noise can sound more aggressive.

I remember being on a Boeing 777 back in November and thinking the engines sounded like a grass cutter. It was on a British Airways B777, GE fitted. It was a very intriguing sound.

Kimberly.


User currently offlineIsitsafenow From United States of America, joined Feb 2004, 4984 posts, RR: 24
Reply 15, posted (10 years 1 week 5 days 23 hours ago) and read 10487 times:

Im kinda glad they do make noise. I miss the old 707 and DC8 waterburners when noise was king. When they develop a total quiet jet engine, I'll go back to watching trains. The noise and smell is half the fun at the airport.
safe



If two people agree on EVERYTHING, then one isn't necessary.
User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4482 posts, RR: 22
Reply 16, posted (10 years 1 week 5 days 23 hours ago) and read 10414 times:

This has been discussed many times, I believe.

From what I gather, it's a noise specific to the CFM engine on the Airbus A320 series, of the tips of the (N1?) fan going supersonic. An exciting sound, eh?

(and yes, this happens in other aircraft too. If you've ever heard an IO-550 Bonanza at full tilt and close range...you'll see what I mean.)

It's always a pleasure to see new and exciting forms of Airbus-bashing, innovative...and ultimately as nonsensical and useless as all forms of A (or B) bashing.

Oh Andreas, come off of your high horse. No one mentioned a negative thing about Airbii. It's a legitimate question. Comments like YOURS detract from the forum.

[Edited 2004-04-07 15:20:40]


I got my head checked--by a jumbo jet
User currently offlineA3xx900 From Germany, joined Jan 2004, 335 posts, RR: 0
Reply 17, posted (10 years 1 week 5 days 23 hours ago) and read 10341 times:

I think I know the sound we're talking about here... but I remember this sound only from older 737s, like -300s and -400s. I dunno what engines they use. IMO Airbuses sound rather like a vacuum cleaner from the inside.
But generally, this is not a question of A or B or C or whatever, it's a question of the engine.... Both Boeing NGs and Airbus use CFM56 engines and IAE engines. So it would be interesting to know on which engines you heard these sounds?
Isn't the sound the engines make on T/O the best thing in flying anyway? No matter if it's a huge PW4600 or a small CFM56? A or B?  Smile

And for Andreas... calm down. Mind your blood pressure.  Smile



Why is 10 afraid of 7? Because 7 8 9.
User currently offlineAircadet From , joined Dec 1969, posts, RR:
Reply 18, posted (10 years 1 week 5 days 23 hours ago) and read 10307 times:

Solnabo: Not the drinking kind  Nuts

User currently offlineHorus From Egypt, joined Feb 2004, 5230 posts, RR: 60
Reply 19, posted (10 years 1 week 5 days 23 hours ago) and read 10257 times:

Why is it that when an aircraft begins its take-off role, for the first few seconds the engine sound is 'low' then all of a sudden the power goes up so much? It is most noticeable on a 744. What is the reason?


EGYPT: A 7,000 Year Old Civilisation
User currently offlineA3xx900 From Germany, joined Jan 2004, 335 posts, RR: 0
Reply 20, posted (10 years 1 week 5 days 22 hours ago) and read 10224 times:

Horus: I'm not a pilot, but I think the thrust levers are pushed forward to only 60% N1 thrust to see if the engines are ok and the readouts are the same for both (or all) engines. Then, if everything is Ok, they push the thrust levers to max or FLEX or whatever the pilots desire.
It also takes some seconds for the engines to reach their max thrust.

Again: I'm not a pilot and my apologies if I said something wrong  Innocent

[Edited 2004-04-07 15:48:10]


Why is 10 afraid of 7? Because 7 8 9.
User currently offlineSW733US From United States of America, joined Mar 2004, 10 posts, RR: 0
Reply 21, posted (10 years 1 week 5 days 22 hours ago) and read 10222 times:

Horus:
The sound you are trying to identify belongs to the engine turbine going to "take off" power. Otherwise, the jet engines are left in a "ground" power which provides enough thrust to get around on the deck.




User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 22, posted (10 years 1 week 5 days 22 hours ago) and read 10187 times:

The Avro100 makes a similar sound actually. Deep and growly. It's especially audible when going to a higher FL.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineCadet93 From United States of America, joined Oct 2003, 133 posts, RR: 0
Reply 23, posted (10 years 1 week 5 days 22 hours ago) and read 10140 times:

OK I am not an engine expert...And I do fly a lot each year. I only fly for pleasure and still manage to fly about 50,000 miles a year. When CO had A300s in their fleet, I noticed that the noise inside the plane was definitely louder than any other plane I had flown. Even more so at take off. This is the major reason I like the less obtrusive sound level in the Boeing. Maybe because its cabin noise levels are at a lower decibel than in the Airbus.
Since I only fly on Boeing now because of CO, I can not say what the new Airbus sounds like. When I get the chance to fly one, I will most definitely be checking this out.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 24, posted (10 years 1 week 5 days 22 hours ago) and read 10123 times:

A340 is quieter than B777, both from anectodal reports and actual measurements.

A319-A321 is in my experience quieter than 737NG.

But for silence, nothing beats the front of an MD-90!



"There are no stupid questions, but there are a lot of inquisitive idiots."
25 LongHauler : I agree. I fly the A319/A320/A321 for AC, and the CFM engines make a very unmistakable sound on takeoff, moreso on the A319 than the rest. In fact the
26 Post contains images A3xx900 : Cadet93: The new Airbuses are much quieter inside. For example I think the 777 is much louder than any modern Airbus. But yeah, try to avoid the old b
27 JBirdAV8r : Horus: The sound you are trying to identify belongs to the engine turbine going to "take off" power. Otherwise, the jet engines are left in a "ground"
28 Aguilo : Just to clarify (since I started the thread): 1. This was not to be a bus basher of a thread, I really don't have any preferences betwen Airbus and Bo
29 Pelican : Yeah that's it - a buzz saw on all A32x with CFM. I never heard it in another plane than in an A320/21. An I have never heard it on a BA 319 (they are
30 Erikr : Below is from Frontier Airline's web site's FAQ about "grinding" noises on the A319: Q: While we were still parked at the gate, when we were taxiing a
31 Starlionblue : The DC-10 is well known for the buzz-saw.
32 EGNR : From what I've observed (externally), the "buzz-saw" sound is a characteristic of the CFM powered Airbus single aisle family, the IAE powered ones do
33 JBirdAV8r : ErikR, Below is from Frontier Airline's web site's FAQ about "grinding" noises on the A319: That sound is another thing entirely.
34 Captaink : This is the airbus take off sound. Vacum - growl - whine -louder whine - Louder growl + buzz The B737 doesnt really sound much different in my opinion
35 Continental : Andreas: I found no form of Airbus-bashing here. Person asked a valid question, let it be. Anyway, I've heard the 'whine' before, but never the roar.
36 Westjet!Eh! : I agree with you that I have also heard that the airbus engines were roaring when take off and landing but in cruising, it is quiet and normal. I have
37 ANA777Master : Its quite ironic that the engines roar like they do, yet have unimpressive linear acceleration. I also think that the engine cowlings/nacelles are not
38 Post contains images EK413 : Aguilo Anyone ever notice on how Airbuses there is always this very "rough sounding" roar on takeoff as if the engines are going to self destruct any
39 USAIRWAYS321 : See, different from many of you above, I've flown the 319, 320 and 321, but I've heard the buzz-saw sound most often and loudest on the A321. Oh well,
40 XFSUgimpLB41X : The buzz saw sound is characteristic of any high-bypass turbofan plane. You can hear it on the CRJ, though it is more of a "eeeeeeeeeeeee" than a "grr
41 Post contains images Cvervais : Ok I"m no expert but I'm not buying the blades going supersonic theory. The reason why is I'm assuming (maybe incorrectly so please kindly correct me
42 Nwfltattendant : I can personally attest to these noises. The loud roar on takeoff is very noticable on the A319/A320 when sitting in the forward jumpseats. The 319 do
43 XFSUgimpLB41X : Cvervais... your quote "The reason why is I'm assuming (maybe incorrectly so please kindly correct me if I'm wrong) that we'd hear a similar noise on
44 Aguilo : Actually the bigger the turbofan diameter the SLOWER the blades are spinning as compared to a smaller fan. Just like a small wheel makes more rotation
45 Asuflyer05 : Also, the sound is definitely present on larger Airbuses as well. As I mentioned before I've been on flights where people were absolutelty terrified b
46 Post contains images N243NW : The DC-10 is well known for the buzz-saw. Indeed, I'm surprised it took so long for someone to finally mention this. When I think of the buzz-saw nois
47 JBirdAV8r : As a side note re: the DC-10... I notice the sound very well in the forward sections of the CF6-powered Boeing 767's as well. After all, it's basicall
48 Post contains images MD11LuxuryLinr : ..."The DC-10 is well known for the buzz-saw. "... Of course, I love the DC10 and the noises it makes on takeoff. BUT, there is one aircraft that soun
49 Post contains images Tristar2000 : MD11LuxuryLinr, I was waiting for someone to mention this... I also believe nothing beats the sound of those RB211s at full power on L-1011 takeoffs.
50 Aguilo : VSGirl: You seem to fly alot as a pax eventhough you are a First Officer. Don't you get tired of being in airports and on planes all the time? Are you
51 Post contains links Pelican : If you are looking for a Video try: http://www.a340.net go to downloads; multimedia; Cockpit - there you will find a lot of impressive take-off Videos
52 Starlionblue : The noise is from the elastic bands unwinding.
53 Post contains links FutureCGNPilot : http://www.airliners.net/discussions/tech_ops/read.main/55215 FCP
54 Post contains links Pelican : The noise caused by hydraulic systems is totally different than the engine buzz saw. BTW it was multimedia - Videos - Cockpit... on http://www.a340.ne
55 Samurai 777 : What's interesting is that when I sat well in fronf of the engines of an AC A320 last year and on takeoff and climbing to cruise altitude, the engines
56 Midway2airtran : I could think of a Boeing response to that question...lol J/K!
57 Ha763 : You can also hear the buzz saw from the BR715s on the 717. In fact, it is the loudest thing you can hear if you are watching one takeoff.
58 Paddy : I know the sound you are talking about, almost sounds like a chainsaw. I've flown on lots of A320 family Airbii and notice it everytime. DC10's make a
59 Post contains images Tom_eddf : talking about annoying noises - I always thought that the 727's high frequency whine during take off and initital climb was quite horrible, it almost
60 Post contains images CPDC10-30 : buzz-saw" sound on the Airbuses but not the Boeings As far as I can tell in my own flight experience, this noise is inherent to some of the GE CF-6 s
61 Lufthansa : GUYS ITS A GE THING! Seriously, the CFM A320s you can notice it....forward of engine on takeoff. On 737NG you can notice it also forward during takeof
62 M404 : That's something I wondered as well. My experiences are that it is in front of the engines where it's heard loudest and it's with CFM engined aircraft
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