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Widebody Vs Narrowbody Engine Noise  
User currently offlineSPR773 From India, joined Jun 2008, 163 posts, RR: 0
Posted (5 years 1 day 22 hours ago) and read 2603 times:

Hi,
Recently a doubt came to mind. Why do narrowbody aircraft engines sound louder than widebody ones ?
As a matter of comparison I would like to compare a B738 and a B773. In both cases I was travelling economy (cattle class for some). Also I was sitting fairly behind I mean not near the overwing exit but about 8-10 rows behind w.r.t. the engine. Is it technology of the engines ? Or is it just my imagination ?  Smile
Also I used to think that the 744 would be noisy due to 4 powerplants but it seemed kinda OK not very loud though.  Smile
Fellow A-netters...any inputs ?
Also if I were to compare an A321 with an A333 perhaps or A343 then is it the same experience ?
By the way I have also travelled on an A320 and it is a bit quieter than the B738 (though I maybe wrong here but just a passing thought).

6 replies: All unread, jump to last
 
User currently offlineFlyingfox27 From United Kingdom, joined Jul 2007, 424 posts, RR: 0
Reply 1, posted (5 years 1 day 22 hours ago) and read 2604 times:

I can hear smaller planes like the ATR and 737 make more noise than a silent 747 gliding by, strange isnt it!

User currently offlineSeaBosDca From United States of America, joined Sep 2007, 5839 posts, RR: 6
Reply 2, posted (5 years 1 day 21 hours ago) and read 2522 times:

Narrowbody engines are closer to the cabin.

On the four-holers, you're getting half of the engine noise further away from the cabin.

Many people claim that the A340-300 is the quietest airliner out there from inside the cabin.


User currently offlineBmacleod From Canada, joined Aug 2001, 2378 posts, RR: 0
Reply 3, posted (5 years 1 day 19 hours ago) and read 2426 times:

I been on a 757 and 767 and haven't noticed any sound difference in the cabin. I do remember though many years ago the DC-9 was definitely noisier..


The engine is the heart of an airplane, but the pilot is its soul.
User currently offlineSpacecadet From United States of America, joined Sep 2001, 3669 posts, RR: 12
Reply 4, posted (5 years 1 day 18 hours ago) and read 2356 times:

I haven't noticed a whole lot of sound difference between narrowbodies and widebodies, only between different planes (regardless of narrow/wide).

Most of what you're actually hearing at cruise is wind noise, not engine noise. Even the difference in decibel level between the front and back of a plane is mostly the wind - the disturbance caused by the wings and the exhaust from the engines means the air is rushing past the fuselage differently than it does in the front of the plane.

Given that, it's going to be mostly the aerodynamics and sound insulation in the fuselage that make one plane louder than another. It doesn't matter narrow or wide.

If you're just talking takeoff and landing, when the engines are spooled up, then I think it's more down to what people have already said about the engines being closer to the fuselage. I also don't have any data on this but I would bet smaller engines are generally louder. That's usually true of any kind of fan - a smaller fan pushing a near-equivalent amount of air as a bigger fan will make more noise doing it.



I'm tired of being a wanna-be league bowler. I wanna be a league bowler!
User currently offlineJetfuel From Australia, joined Jan 2005, 2252 posts, RR: 0
Reply 5, posted (5 years 1 day 12 hours ago) and read 2138 times:

Just sit in 1a and its quiet. 727/dc9 is wonderfully quiet up front


Where's the passion gone out of the airline industry? The smell of jetfuel and the romance of taking a flight....
User currently offlineSPREE34 From United States of America, joined Jun 2004, 2264 posts, RR: 9
Reply 6, posted (5 years 1 day 11 hours ago) and read 2051 times:



Quoting SeaBosDca (Reply 2):
Many people claim that the A340-300 is the quietest airliner out there from inside the cabin.

I'm one of them. Of all of the long hauls I've been on, the 340 seems quietest.

I wonder if aircraft cross sections have any affect on cabin noise?



I don't understand everything I don't know about this.
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