kuhne
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Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 8:13 pm

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.
 
EXAAUADL
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 8:18 pm

The two stroke engines
 
kuhne
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 8:33 pm

what exactly does that mean and why does the sound happen
 
helvknight
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:03 pm

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]
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Gr8Circle
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:13 pm

Have you heard the sound inside a 773 when the engines are starting up....sounds like a very loud drill being overloaded... Big grin
 
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kc135topboom
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:13 pm

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.
 
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Stitch
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:19 pm

I do find the A320 to be a more preferable ride to a 737 Classic, though the 737NG is essentially equivalent.
 
AlexPorter
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:35 pm

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.
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dj738
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:49 pm

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

I believe you mean IAE V2500 engines, not RollsRoyce!
 
BrianDromey
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:53 pm

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)
 
kaneporta1
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:57 pm

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
 
dj738
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 9:59 pm

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.
 
kuhne
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 11:49 pm

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.
 
TheCol
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 11:57 pm

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.
 
victor009
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Wed Oct 17, 2007 11:57 pm

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.
 
747fan
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 3:48 am

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
 
sparkingwave
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 6:37 am

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!
 
phxplanes
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 6:49 am

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.
 
abbamd
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 7:10 am

Here is a better GE90 take-off sound.

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

Woo! The sound, the power. Incredible.
 
B747forever
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 7:23 am

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
 
AlexPorter
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 7:35 am

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.
Last Flight: SCX701 MSP-PHX B738 8Jan2008
 
kuhne
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 8:03 am

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.
 
kappel
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 9:00 am

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
 
n318ea
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 11:37 am

Sigh!
Now if only RR could just bring re-create this sound for the Trents: http://www.youtube.com/watch?v=hp-vHRQ08fU
 Smile
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kearney
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 11:51 am

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
 
brucek
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 12:55 pm

Quoting Helvknight (Reply 3):
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.

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, efficiency, etc.? Isn't it something like 61" (NG) compared to 70" (A32)? Assuming that the thrust is proportional to the area of the fan, and that varies as the square of the diameter, that makes for quite a larger thrust potential for the A32, if the fans are at the same speed.

Thanks- Bruce.
 
b777a340fan
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 1:09 pm

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 thought Airbus planes had a quieter take-off/landing. AND, I hear the new jewel (the A380 that is) is even better. Don't mean to start an A vs. B debate, but that's my 2 cents.
 
avroarrow
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 1:13 pm

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 sites to compare the 320 family and 737 family variants.
http://www.airbus.com/en/aircraftfam...lies/a320/a320/specifications.html
and
http://www.boeing.com/commercial/737family/pf/pf_800tech.html


I've never found the CFM buzz sound offensive, just different, and I'm sure as with everything that makes noise it has a resonant frequency that makes it louder at some speeds than it is at others. If you just want to hear the thunder sound, then sit behind the wing and that'll be about all you hear. At the end of the day so long as it keeps making noise through the flight thats all the really matters.   Smile

[Edited 2007-10-18 06:18:08]
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soon7x7
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 1:30 pm

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 noisier engines so more of the New York population will move!!!!
 
CF188A
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 1:35 pm

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, 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
same reason why new Boeing's sound like furnaces....

Quoting Kearney (Reply 26):
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

no Brandon your quite wrong..... It sounds like manly version of Charlotte church I'm afraid .... nothing to interesting.

[Edited 2007-10-18 06:37:28]
Dream as if you'll live forever. Live as if you'll die tomorrow~ RIP ... LJFM
 
sh0rtybr0wn
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 2:24 pm

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 cool as the sound of the RR on the 777s.

I'll agree, from this video, this sound is semi annoying, but luckily, I'm usually in the back of the plane where you can't hear this sound.

http://flightlevel350.com/Aircraft_A...e_Airways_Aviation_Video-9406.html
 
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CALTECH
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 2:51 pm

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 British 777s are coming without looking.Therre is a wierd type of sound that comes from the Jetblue Airbuses, Southwest 737 NG sound quieter. It is a strange kind of hum or buzz that the Airbus 320s make, and one of a kind. Can tell the difference without looking, a game we play, and verified it with the binoculars. The loudest has to be the Northwest DC-9s, with American MD-80s right behind, they sound like fighters cruising by, though when F-15s fly by, they do have a sound all their own.
UNITED Would Be Nice
 
7cubed
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 3:07 pm

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 (noticeable anyways) sitting in roughly the same place in proximity to the engines. I liked layout of the 757 better especially the placements of the restrooms. My wife, who is your average passenger - not knowing anything about planes, commented that she liked "this plane" (757) better. She offered no real explanation other than it felt roomier and "flew nicer".
joe
 
pnwtraveler
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 3:15 pm

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 don't sound as distinctive. Certainly the AC 320 family. Rather than a buzz I would describe it as a back of the throat kind of growl with nasal qualities :P. It is particularly noticable on climb out. Yes you hear it distinctly in the first half of the plane. When I wasn't upgraded 12D was my seat of choice. The A330 and some of the A300 have a vaccum cleaner higher pitched sound on the ground and take off. The 777 has a low rumble sound that is remarkably quiet. Once overhead holding at 3,000 before climbout is clean I can't discern the difference. The AF 747 that flies over everyday around 12 noon has a distinctive rumble to it as well.
 
747fan
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 3:17 pm

Quoting Brucek (Reply 27):
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, efficiency, etc.? Isn't it something like 61" (NG) compared to 70" (A32)?

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; this engine is basically the foundation for the CFM56 family.Tthe CFM56-3 powers the 737-300, -400, and -500 and is basically a cropped-fan (60 in. diameter fan) derivative of the CFM56-2. There is the CFM56-5, of which there are 3 subvariants: the -5A, -5B, and the -5C. The -5A is a more advanced derivative of the CFM56-2 and -3 (68.3 in. fan diameter like the CFM56-2), and was the initial CFM powerplant for the A320. The -5B is a more capable version based off the -5A (same 68.3 in. diameter as the -5A and -2) and was originally designed for the A321, but has ended up powering every derivative of the A320 family and is much more common than the -5A (I believe the -5A only powered the initial A320-100). The -5C is a more powerful, enlarged fan (72.3 in. compared to 68.3) derivative of the -5A and B. It solely powers the A340 and is responsible for its much maligned takeoff and climb performance. All versions of the -5 have FADEC. Finally you have the -7B, which solely powers the 737-600, -700, -800, and -900. It is a more advanced derivative of the CFM56-3 (has a slightly enlarged fan, 61 in. compared to 60 in.) that incorporates many features of the CFM56-5, such as FADEC. I believe the CFM56-5B, 5C, and 7 all share the same HP core, correct me if I'm wrong.
Sorry for going overboard, but I guess I answered your question. The more prominent buzzing sound of the A320's engines is likely due to their larger fan diameter. And if you think that's prominent, listen to a DC87 or A343 takeoff from the outside; that additional prominence is likely due to 4 engines compared to 2.
You're probably right that A320 engines have the potential for more thrust due to their larger size, but some thrust variants of the -7 have more thrust than some variants of the -5 (for example, the -7 powering the 738/739 can have up to 27K lb. of thrust, the -5A thrust variant powering the A320-100 has 22K lb. of thrust). So just because an engine has a larger fan diameter doesn't necessarily mean it has more thrust. Example: the RB211-535E4 on the 757 has a smaller fan diameter than the competing PW2000 (74.1 in. compared to 78.5 in. for the Pratt). The RB211 generally is slightly more powerful than the Pratt (most Pratt users use the 37K PW2037, RR users have the 40.1K -E4 or 43.1K -E4B). However, the Pratt comes close, with 43,000 lb. of thrust with the PW2043 compared to 43,100 for the -E4B. I hope nobody beat me to answering your question, as I really spent lots of time and effort typing this post up.  relieved 
 
af773atmsp
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 3:36 pm

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 though it sounds weird, and since some A319s/320s and 738s are only a couple years old people would expect to hear nothing when on takeoff.
It ain't no normal MD80 its a Super 80!
 
flysherwood
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 4:01 pm

Quoting Victor009 (Reply 15):
Check ur ears mate,

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

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 1A. During takeoff, it is very loud (it does sound like a lawnmower). The first time I flew on a A318 I was totally taken aback by the sound. But I also agree that it is a very comfortable airplane and I really enjoy flying on the A318/319.
 
captaink
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 4:06 pm

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 Mexicana Airbii airplanes. Listen to a recording I took of US 320 taking off from Barbados. The was in row 2.

There is something special about planes....
 
Mir
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 4:10 pm

Quoting Abbamd (Reply 19):
Here is a better GE90 take-off sound.

Cool, but I hope that that whine gets quieter eventually - it would get really irritating over a long-haul flight.

-Mir
7 billion, one nation, imagination...it's a beautiful day
 
etops1
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 4:18 pm

all hp's airbuses have iae engines not rr. the 757's have rb211's.
 
baguy
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RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 4:36 pm

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... 

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 next to me!

BAguy
 
richierich
Posts: 3288
Joined: Sat Nov 04, 2000 5:49 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 5:26 pm

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 engines do sound better than others.

Sitting in the forward cabin of any IAE-powered Airbus and you wonder if you really are on a jet aircraft. I can't say it sounds bad but the buzzing noise is quite impressive. Its unlike almost any other aircraft I have ever been on. However, sitting on the same aircraft - say behind the wings - is a completely different experience. The roar of the engines is quite apparent although the cabin is usually quiet at cruise.

After not having flown a 737 for quite a while, a recent experience reminded me how noisy these things really are. Yes, the noises are different (I flew on a US 737-400) but the ambient noise is also much more noticeable. The roar of the engines at takeoff was probably about the same from where I sat.

I've yet to fly at the front of a 717 but I can only imagine that there is relative silence up there...
None shall pass!!!!
 
747fan
Posts: 862
Joined: Thu Jun 21, 2007 7:40 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 5:36 pm

Quoting Mir (Reply 38):
Cool, but I hope that that whine gets quieter eventually - it would get really irritating over a long-haul flight.

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/slipstream noise once the aircraft begins to pick up more speed above 10K ft. The engines are generally at a low enough N1 speed while cruising so that the fan growl basically dissapears; this usually happens at an N1 speed of around 90, the N1 speed of the engines while cruising is generally in the 80's.
 
GeorgeJetson
Posts: 126
Joined: Tue Jun 19, 2007 1:36 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 7:25 pm

Quoting N318EA (Reply 23):
Sigh!
Now if only RR could just bring re-create this sound for the Trents: http://www.youtube.com/watch?v=hp-vH...Q08fU

That low rumble sounds so cool. It’s the typical sound of Rolls-Royce engines.
Meet George Jetson
 
FlyASAGuy2005
Posts: 3964
Joined: Sun Sep 23, 2007 4:55 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 8:04 pm

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 has been a favorite of my for several years now. Just listen to her on initial!
http://www.flightlevel350.com/Aircra..._Air_Lines_Aviation_Video-987.html

Also a favorite, the PW 757. You also gotta love when they pull back on the throttle to maintain speed. That use to scare me.
http://www.flightlevel350.com/Aircra..._Air_Lines_Aviation_Video-803.html
What gets measured gets done.
 
Rj111
Posts: 3007
Joined: Wed Sep 08, 2004 9:02 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Thu Oct 18, 2007 8:07 pm

Quoting 747fan (Reply 15):
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!

Man, the GE90 is impressive but whiney. I personally prefer the noise of the Trent.

http://www.youtube.com/watch?v=KXPertcLums
 
747fan
Posts: 862
Joined: Thu Jun 21, 2007 7:40 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Fri Oct 19, 2007 1:09 am

Quoting RJ111 (Reply 45):
Man, the GE90 is impressive but whiney. I personally prefer the noise of the Trent.

 checkmark  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 could only hear the exhaust roar, although the spool-up sounded neat. I've ridden in the front of a UA 772 on DEN-ORD, the sound of those was basically a lower-pitched version of the Trents depicted in your video and it sent chills up my spine, along with the spool-up.
Here's a UA 772 with PW4090's taking off from AMS:
www.youtube.com/watch?v=TjGEGOhkbbA
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Fri Oct 19, 2007 1:55 am

Quoting Brucek (Reply 25):
So, do the A32 engines have more thrust (because of larger fan) than the B73NG engines?

A tiny bit, but it's not major. A32x's can get away with a bigger fan because of the taller gear.

Quoting Brucek (Reply 25):
Isn't it something like 61" (NG) compared to 70" (A32)? Assuming that the thrust is proportional to the area of the fan

Thrust isn't proportional to fan area. Partly because the fan power has to come from the core and the core power doesn't change much from model to model and partly because you get a lot more thrust from the outer part of the fan than the inner.

Tom.
 
spacecadet
Posts: 2789
Joined: Thu Sep 20, 2001 3:36 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Fri Oct 19, 2007 4:19 am

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. They sound like they're powered by rubber bands.

I remember back in the early 80's, I lived even closer to SFO and right under another takeoff pattern, and on top of a cliff. So planes would fly over at about 500 feet half the time, especially with the performance a lot of planes had in those days. (My parents hated this, but I loved it.) I remember most planes just had a dull-sounding roar as they went overhead, but the 747 with its PW engines had this *loud*, low growl. Just like the A320 now, I could always tell one was coming before it even left the runway. But it was a much cooler sound than the A320 has; the A320 sounds like a toy.
I'm tired of being a wanna-be league bowler. I wanna be a league bowler!
 
marcusair
Posts: 34
Joined: Thu Sep 13, 2007 4:57 am

RE: Why Do The New Airbus' Sound Like Lawnmowers?

Sat Oct 20, 2007 4:56 pm

The real reason..............Airbus went way over budget on the craft and had to sign a deal with John Deer for the new engines!  Wink