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Why Do The New Airbus' Sound Like Lawnmowers?  
User currently offlineKuhne From Mexico, joined Jun 2006, 51 posts, RR: 0
Posted (7 years 1 month 1 week 2 days 11 hours ago) and read 15493 times:

after reading many posts on how airbus planes are much quieter than some boeings, I was happy to get into one for the first time a few weeks ago, I flew Mexicana's shiny new Airbus 319 and 318.. I couldn't wait to see how the takeoff would sound, being used to flying 737-200 planes, I know what noise is, I was expecting a real difference.... until the thing took off and I tought I was flying in a world war 2 plane. WTF??? seriously, did I just pick up a cab in Mexico City? what the hell is up with that sound? it sounds horrible!

to it's credit, the plane is fabulous and the landing was really really quiet, unlike the 737-200 with its reverse thrusters that sounds like im about to go to the moon or something.

52 replies: All unread, showing first 25:
 
User currently offlineEXAAUADL From , joined Dec 1969, posts, RR:
Reply 1, posted (7 years 1 month 1 week 2 days 11 hours ago) and read 15490 times:

The two stroke engines

User currently offlineKuhne From Mexico, joined Jun 2006, 51 posts, RR: 0
Reply 2, posted (7 years 1 month 1 week 2 days 11 hours ago) and read 15424 times:

what exactly does that mean and why does the sound happen

User currently offlineHelvknight From , joined Dec 1969, posts, RR:
Reply 3, posted (7 years 1 month 1 week 2 days 11 hours ago) and read 15302 times:

Are you talking about a low buzz during takeoff and climb? If so that is the tips of the fan blades going supersonic.

The engines on an A32S are a much larger diameter than a 737 due to the greater ground clearance so the tip speed is higher.

[Edited 2007-10-17 14:04:54]

User currently offlineGr8Circle From Canada, joined Dec 2005, 3124 posts, RR: 4
Reply 4, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15227 times:

Have you heard the sound inside a 773 when the engines are starting up....sounds like a very loud drill being overloaded... Big grin

User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12173 posts, RR: 51
Reply 5, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15223 times:

Quoting Kuhne (Thread starter):
I flew Mexicana's shiny new Airbus 319 and 318.. I couldn't wait to see how the takeoff would sound, being used to flying 737-200 planes,

Perhaps there really is some differences between a 1960s airplane and a 1990 airplane? DUH..................

Quoting Kuhne (Thread starter):
after reading many posts on how airbus planes are much quieter than some boeings,

Two things are the main noise makers, the engines, and the control systems (slotted flaps, etc.). Most Airbusses and Boeings use the same engines.


User currently offlineStitch From United States of America, joined Jul 2005, 31240 posts, RR: 85
Reply 6, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15186 times:
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I do find the A320 to be a more preferable ride to a 737 Classic, though the 737NG is essentially equivalent.

User currently offlineAlexPorter From , joined Dec 1969, posts, RR:
Reply 7, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15102 times:

I have noticed that sound before on various A320-series jets but I've mostly noticed it on older jets, unless perhaps it's just a Rolls-Royce thing (the old A320s I've flown were HPs with RR engines, while the newer ones were A318s and A319s with F9 and NW with CFMs (I assume). So perhaps its an engine thing. All I can say is that the CFMs sound the same as 737NGs because it's pretty much the same engine adapted for a different nacelle, etc. Meanwhile the RR engine is a whole separate engine so maybe that's it.

Also, this buzzing sound is noticable from the ground. Here near PHX, when I hear that buzzing sound it's either SOME of the US A320s or a US 757. Both of which use RR engines. The US 737s don't do it, and the Southwest 737s have more of a typical rushing roar sound so to speak, but not a buzzing.


User currently offlineDJ738 From New Zealand, joined Jun 2005, 410 posts, RR: 1
Reply 8, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15030 times:

Quoting AlexPorter (Reply 8):
the old A320s I've flown were HPs with RR engines,

I believe you mean IAE V2500 engines, not RollsRoyce!


User currently offlineBrianDromey From Ireland, joined Dec 2006, 3926 posts, RR: 9
Reply 9, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 15016 times:

Quoting AlexPorter (Reply 8):
it's either SOME of the US A320s or a US 757. Both of which use RR engines. The US 737s don't do it, and the Southwest 737s have more of a typical rushing roar sound so to speak, but not a buzzing.

All of the USAir (East) are fitted with CFM 65 engines.
Both the HP & US 757 are fitted with RR's

There is not a single A320 in the entire world fitted with RR engines! The other engine choice on the A320 is the IAE V2500, it is manufactured by P&W, MTU, a Japaneese consortium & RR, IIRC. The RRs on 757s and IAE's on A320s do look similar though.....

Maybe the difference in noise is due to the shape of the engines on the 737 and A320, along with aerodynamic differences.....certainly an FR 737 (CFM) sounds very different to an EI A320 (also CFM powered)

Brian.



Next flights: MAN-ORK-LHR(EI)-MAN(BD); MAN-LHR(BD)-ORK (EI); DUB-ZRH-LAX (LX) LAX-YYZ (AC) YYZ-YHZ-LHR(AC)-DUB(BD)
User currently offlineKaneporta1 From Greece, joined May 2005, 744 posts, RR: 12
Reply 10, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 14991 times:

Quoting Kuhne (Thread starter):
I know what noise is, I was expecting a real difference.... until the thing took off and I tought I was flying in a world war 2 plane. WTF??? seriously, did I just pick up a cab in Mexico City? what the hell is up with that sound? it sounds horrible

Let me guess, you were sitting somewhere between rows 1 and 5...



I'd rather die peacefully in my sleep, like my grandfather, not terrified and screaming, like his passengers
User currently offlineDJ738 From New Zealand, joined Jun 2005, 410 posts, RR: 1
Reply 11, posted (7 years 1 month 1 week 2 days 10 hours ago) and read 14977 times:

http://www.v2500.com/company/shareholders.shtml

Pratt & Whitney produces the combustor and high-pressure turbine, Rolls-Royce the high-pressure compressor, JAEC the fan and low-pressure compressor and MTU the low-pressure turbine.


User currently offlineKuhne From Mexico, joined Jun 2006, 51 posts, RR: 0
Reply 12, posted (7 years 1 month 1 week 2 days 8 hours ago) and read 14823 times:

Quoting DJ738 (Reply 12):
Let me guess, you were sitting somewhere between rows 1 and 5...

Yes, I was in three flights, two of them in a A318 in seats 3f the first time and 1f the second time, the other one was a a319 and I was in 1f. these are the mexicana airbus which are supposed to be brand new and stuff.

My girlfriend was siting in row six with her mother and she too when we got off the plane said "did we just ride in a propeller plane? what the hell was that noise!"

I also flew (today) on the third row on an old 737-200, the sound was nowhere as bad, however once in the air and on landing, no comparison at all, the bus was quiet as hell.


User currently offlineTheCol From Canada, joined Jan 2007, 2039 posts, RR: 6
Reply 13, posted (7 years 1 month 1 week 2 days 8 hours ago) and read 14777 times:

Quoting EXAAUADL (Reply 1):

 rotfl   rotfl   rotfl   bigthumbsup 

That's the funniest thing I've seen all day, and I've just happened to have a really funny day. So I guess thats saying something.



No matter how random things may appear, there's always a plan.
User currently offlineVictor009 From United Kingdom, joined Jan 2006, 109 posts, RR: 0
Reply 14, posted (7 years 1 month 1 week 2 days 8 hours ago) and read 14778 times:

Check ur ears mate,

I flew on QR A300 last month and even that was quiet so dunno what you talking about.

I guess you are used to ur 737 classics



XWB- The one to fly.
User currently offline747fan From United States of America, joined Jun 2007, 1188 posts, RR: 1
Reply 15, posted (7 years 1 month 1 week 2 days 4 hours ago) and read 14518 times:

That sound that you're hearing can only be heard when sitting in front of (or even with) the engines, and is the sound of the fan blades reaching a supersonic speed.
Virtually every turbofan engine, particularly high-bypass ones, make this distinctive sound. The particular lawn-mower sound you are describing is rather unique to the CFM56. That sound can be heard on the 737 classic/NG, A340, and DC-8 Super 70's (and KC-135, for that matter). The IAE V2500 also sounds pretty similar, although it has a little more of a whine to it, maybe its due to the wide chord fan blades (like the RB211 on the 744, 763, and 752).
If you though the A320 sounded interesting, catch a ride in the front of a GE90-powered 777 (if you're fortunate enough to be able to afford F or J class). Those things are quite loud and sound like a heavy duty air compressor. Its a very unique sound!
You've got the vacuum cleaner-like whine of the JT8D's, which is a very unique (and loud, if you're in the back, although JT8D's almost get quieter when they hit takeoff power compared to "stabilization" power). The CF6's/PW4000/JT9D sound sort of like a massive In Sink Erator garbage disposal (without the food grinding sound) when you're sitting up front. And you can't forget the RB211 - its kinda similar to the IAE V2500, but sounds more authorative and powerful.
You can also hear this sound on the ground when a turbofan-powered jet take off, although its more prominent with some planes than others. For example, the CFM A320's (and definitely A340's, DC8-70's) seem more prominent on the outside than the CFM 737's. On the other hand, widebodies powered by CF6-80's and PW4000's have a less noticeable fan growl, just a prominent and distinctive "screech" from the compressors as they fly overhead. On the other hand, the 757, rather its in RB211 or PW2000 form, sounds very distinctive on takeoff with a very prominent fan growl. And don't get me started on DC-10's, L-1011's, or 747 classics.
Here's a video of an Iberia CFM56-powered A320 taking off. The lawnmower sound is very obvious in this video, I assume that's the sound you were referring to:
www.flightlevel350.com/aviation_video.php?id=7375
Here's an outside video IAE V2500-powered UA A319 taking off from Sangster Intl. in Montego Bay. Perfectly represents that buzz sound. I would love to stay at that resort the video was taken from, nothing like spotting all day long from the beach! Big grin
www.youtube.com/watch?v=brkHJyrxZDw
Here's a GE90-powered BA 777 taking off from LHR. If you didn't like the A320's sound, wait until you hear this thing! Yikes! By the way, T5 looks nice!
www.youtube.com/watch?v=vzYgyJlcYQg


User currently offlineSparkingwave From South Korea, joined Jun 2005, 674 posts, RR: 0
Reply 16, posted (7 years 1 month 1 week 2 days 1 hour ago) and read 14318 times:

Quoting Kuhne (Thread starter):
until the thing took off and I tought I was flying in a world war 2 plane. WTF??? seriously, did I just pick up a cab in Mexico City? what the hell is up with that sound? it sounds horrible!

You know what? I noticed this too flying on an NH A320 between ICN and NRT. On takeoff there was a loud buzzing sound from the engines and it was very annoying. It didn't subside until the plane had leveled off at higher altitude. I couldn't believe the noise level and was quite disappointed. But until your post I didn't know if it was just that aircraft or a more common problem.



Flights to the moon and all major space stations. At Pan Am, the sky is no longer the limit!
User currently offlinePhxplanes From United States of America, joined Feb 2005, 436 posts, RR: 0
Reply 17, posted (7 years 1 month 1 week 2 days 1 hour ago) and read 14216 times:

I have always wondered what causes those noises. It sounds like something is grinding inside the engine. It doesnt make it sound like an airplane engine.

User currently offlineAbbamd From United States of America, joined Jan 2007, 15 posts, RR: 0
Reply 18, posted (7 years 1 month 1 week 2 days 1 hour ago) and read 14034 times:

Here is a better GE90 take-off sound.

http://www.youtube.com/watch?v=P7vxj327Eg4

Woo! The sound, the power. Incredible.


User currently offlineB747forever From Sweden, joined May 2007, 17126 posts, RR: 10
Reply 19, posted (7 years 1 month 1 week 2 days ago) and read 13907 times:

Quoting Abbamd (Reply 20):
Here is a better GE90 take-off sound

God what a sound. Really power full take off.



Work Hard, Fly Right
User currently offlineAlexPorter From , joined Dec 1969, posts, RR:
Reply 20, posted (7 years 1 month 1 week 2 days ago) and read 13790 times:

Quoting BrianDromey (Reply 10):
All of the USAir (East) are fitted with CFM 65 engines.

Well I was talking about PHX.. i.e. HP birds.


At any rate I didn't realize that the HP A320s had those engines - I thought they were RRs because they do indeed look a good deal like the 757 RR engines. They also often sound similar on the ground.


User currently offlineKuhne From Mexico, joined Jun 2006, 51 posts, RR: 0
Reply 21, posted (7 years 1 month 1 week 2 days ago) and read 13583 times:

Wow! thanks for the explanation and the videos, yes that first airbus video you posted is exactly what I meant, you can't really hear the noise that much in the video unlike in real life which was really loud but thankfully it gets quiet after a while.

I've been on a 777 before, 4 times actualy but never that near an engine I don't think or maybe I just dont remember the sound.


User currently offlineKappel From Suriname, joined Jul 2005, 3533 posts, RR: 17
Reply 22, posted (7 years 1 month 1 week 1 day 23 hours ago) and read 13185 times:

Quoting 747fan (Reply 17):
catch a ride in the front of a GE90-powered 777 (if you're fortunate enough to be able to afford F or J class). Those things are quite loud and sound like a heavy duty air compressor. Its a very unique sound!



Quoting Kuhne (Reply 23):
I've been on a 777 before, 4 times actualy but never that near an engine I don't think or maybe I just dont remember the sound.

I flew KLM AMS-JFK-AMS last year in row 11, right next to the engine. With KLM, economy is from row 10 on, and row 10 to, say 13 are right next to the engines. Amazing sound indeed on takeoff, loved it. And those bad boys are huge when you sit right next to them!!!



L1011,733,734,73G,738,743,744,752,763,772,77W,DC855,DC863,DC930,DC950,MD11,MD88,306,319,320,321,343,346,ARJ85,CR7,E195
User currently offlineN318EA From , joined Dec 1969, posts, RR:
Reply 23, posted (7 years 1 month 1 week 1 day 20 hours ago) and read 12221 times:

Sigh!
Now if only RR could just bring re-create this sound for the Trents: http://www.youtube.com/watch?v=hp-vHRQ08fU
 Smile


User currently offlineKearney From Canada, joined Nov 2006, 140 posts, RR: 0
Reply 24, posted (7 years 1 month 1 week 1 day 20 hours ago) and read 12177 times:

Quoting Gr8Circle (Reply 4):
Have you heard the sound inside a 773 when the engines are starting up....sounds like a very loud drill being overloaded...

A 773 starting is the most awsome sound ever!

Brandon


25 Brucek : So, do the A32 engines have more thrust (because of larger fan) than the B73NG engines? Or do the A32 fans run at a slower speed for noise, efficienc
26 B777A340Fan : Unless you were actually in the engines, I don't know where the "lawnmower" sound came from. However, from my personal experience, I have always thoug
27 Post contains links and images AvroArrow : Hey Bruce, from their respective websites it would appear the the A320 and 737-800 have about the same thrust rating. Fee free to cruise around both s
28 Soon7x7 : Luv that sound...in fact bring back the old JT9-7A's and the RB211's...this quiet stuff is for the birds....better yet, I demand a NEW concorde with n
29 Post contains links CF188A : Quoting Kuhne (Thread starter): I flew Mexicana's shiny new Airbus 319 and 318.. I couldn't wait to see how the takeoff would sound, being used to fly
30 Post contains links Sh0rtybr0wn : Here is the perfect video to demonstrate the lawn-mower sound of the A320 ( from onboard, in front of the engine , of course ). It's definitely not as
31 CALTECH : Living under the approach from the northeast to Orlando, we hear a lot of planes approaching, my father and I. We know when the Virgin 747s and Britis
32 7cubed : I just did a PHL to LAS last month. Going out was a A320 and coming back was a 757. I liked the 757 better. There was no difference in noise (noticeab
33 Pnwtraveler : I can always tell two planes distictly appart when they fly over my house on departures from YYZ especially. The A320 family and the 767. The others d
34 Post contains images 747fan : There are multiple variants of the CFM56. There are the original CFM56-2 (used on KC135 and re-engined DC-8-70's), which has a 68.3 in. diameter fan;
35 Af773atmsp : I've also heard this noise before in NW's A319s/320s, 752s, and sometimes I even hear that sound from a SY 738 when taking off. I like the noise even
36 Flysherwood : I know exactly what he is talking about. I just got back from the East. On the flight between DTW - IND we flew on a A319 of NWA and I was seated in
37 Captaink : That is a very typical Airbus A32X sounds. It is also heard on the 737NG but a bit less due to the shape/size of the engine. Nothing was wrong with Me
38 Mir : Cool, but I hope that that whine gets quieter eventually - it would get really irritating over a long-haul flight. -Mir
39 Etops1 : all hp's airbuses have iae engines not rr. the 757's have rb211's.
40 Baguy : When I flew an AF 773 to KIX in April, it really hurt my ears, the whole aircraft was vibrating very fast, I couldn't even hear my auntie who was nex
41 Richierich : I find it amusing that people on here compare the sound of an engine to its "power". Of course, there is no relation, but I will admit that some engin
42 747fan : It does once the aircraft reaches cruising altitude and the engines aren't at climb/takeoff thrust. The sound also usually gets overshadowed by wind/
43 GeorgeJetson : " target=_blank>http://www.youtube.com/watch?v=hp-vH...Q08fU That low rumble sounds so cool. It’s the typical sound of Rolls-Royce engines.
44 Post contains links FlyASAGuy2005 : Nothing better than sitting up front on one of Delta's 757's! Boy I loved riding on those in first just to hear the rngins on spool-up. This is video
45 Post contains links RJ111 : Man, the GE90 is impressive but whiney. I personally prefer the noise of the Trent. http://www.youtube.com/watch?v=KXPertcLums
46 Post contains links and images 747fan : I personally prefer the noise of both the Trent and the 112" PW4000. I've ridden on a DL 772 with Trents before, but I was in row 52 so I obviously c
47 Tdscanuck : A tiny bit, but it's not major. A32x's can get away with a bigger fan because of the taller gear. Thrust isn't proportional to fan area. Partly becau
48 Spacecadet : I live under one of the takeoff patterns at JFK and I can tell one of those JetBlue A320's coming at us as soon as it starts its roll down the runway.
49 Post contains images Marcusair : The real reason..............Airbus went way over budget on the craft and had to sign a deal with John Deer for the new engines!
50 FlyPWM : I was wondering what that sound was, I just flew B6 A320 a couple of weeks ago and was in seat 3A. I had a feeling it had something to do with the eng
51 Post contains links JBo : That CFM56 buzz also comes from its early ancestor the TF-39, as seen and heard on this C-5 video: http://www.youtube.com/watch?v=Asucp_KH84A I think
52 Post contains images KPDX : The A340 sounds like a huge lawnmower. KPDX
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