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737 And 73G Noise  
User currently offlineAirWillie6475 From United States of America, joined Jan 2005, 2448 posts, RR: 1
Posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 3049 times:

I have flown the 737 and 73G 4 times in the last 2 weeks. I also took an airbus a320 flight in between. I would never really care about the cabin noise enough to ask a question on this site but the 73Gs were VERY loud compared to the 737. The a320 was so quiet that I could have a conversation with the person on the other side of the isle. I thought new planes equal quiet cabins. Has anyone noticed this on the 73Gs. Next time I am going on a 737 which was more comfortable.

13 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 1, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 3036 times:

While I will agree some 737s are noisy, I don't quite understand which version you are referring to. 737-700=73G. Which one are you calling the "737"?


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineDfwRevolution From United States of America, joined Jan 2010, 977 posts, RR: 51
Reply 2, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 3016 times:

Quoting AirWillie6475 (Thread starter):
I would never really care about the cabin noise enough to ask a question on this site but the 73Gs were VERY loud compared to the 737.

Could depend on any number of variables, including where you sat. Aft of the engines is noticibly louder on virtually all airplanes. The 737NG series doesn't have a reputation for uncomfortable and unreasonable cabin noise, so I'm inclined to believe your experience was an anamoly. It may be something as simple as mistaking which type of airplane you were on.


User currently offlineA340600 From United Kingdom, joined Aug 2003, 4105 posts, RR: 51
Reply 3, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 2984 times:

Quoting DfwRevolution (Reply 2):
The 737NG series doesn't have a reputation for uncomfortable and unreasonable cabin noise, so I'm inclined to believe your experience was an anamoly. It may be something as simple as mistaking which type of airplane you were on.

The 73G does have a bit of a reputation for this, particularly in the flightdeck. When riding on them I have overheard many passengers stating that the cabin noise was extremely loud.

When I took my first 73G flight I was greatly surrised, especially with the thrust reverse. It was louder than the 2nd generation 737s I have flown,

Sam



Despite the name I am a Boeing man through and through!
User currently offlineCory6188 From United States of America, joined Feb 2004, 2686 posts, RR: 5
Reply 4, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 2977 times:

I think that something is missing from AirWillie's observations. I flew B6 once JFK-MCO-JFK (sacriledge, I know!), and to me, the engines on their A320s seemed to be much louder than those on CO's 737s. The IAE engines on the A320s sounded like extremely loud lawn mowers, with grinding noises, unlike the high-pitched whine from the CFM engines on the 737s.

User currently offlineAirWillie6475 From United States of America, joined Jan 2005, 2448 posts, RR: 1
Reply 5, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 2967 times:

I am talking about the 737-700 and the 737-300.

User currently offlineA340600 From United Kingdom, joined Aug 2003, 4105 posts, RR: 51
Reply 6, posted (9 years 5 months 2 weeks 3 days 22 hours ago) and read 2933 times:

Personally, I find the IAE's to be miuch quieter than CFM's, but yes, they both do sound like lawnmowers Wink

However, the noise doesn't even touch on that of the 73G, maybe it is something that Boeing changed on the NG making the cabin more vulnerable to engine noise,

Sam



Despite the name I am a Boeing man through and through!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 7, posted (9 years 5 months 2 weeks 3 days 21 hours ago) and read 2920 times:

Quoting AirWillie6475 (Reply 5):
I am talking about the 737-700 and the 737-300.

Ah!

Well, the 737-300 (733) is part of the 737 Classic family. It would on paper be noisier than the 737-700 (73G) which is part of the 737 Next Generation family. However the fuselages are pretty much the same, so any noise reduction would be on the part of the engines. It can also vary greatly depending on where you are seated.

I will agree that the A32x family tends to be quieter.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineHa763 From United States of America, joined Jan 2003, 3657 posts, RR: 5
Reply 8, posted (9 years 5 months 2 weeks 3 days 21 hours ago) and read 2882 times:
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I don't recall any significant difference in cabin noise when I flew a CO 735 and 738. On the 735 I sat slightly in front of the engine and my seat on the 738 was at the front of the wing root, both being window seats. I recall I could hear other people's conversations, even those across the aisle on both flights.

User currently offlineFutureATP From United States of America, joined Feb 2000, 221 posts, RR: 0
Reply 9, posted (9 years 5 months 2 weeks 3 days 14 hours ago) and read 2736 times:

I have only flown on the 737NG family 3 times in my life, and only twice aft of the engine. And always a window seat. When seated aft of the engine I too thought that the NG was louder than a 2nd gen 737, but only on takeoff.

I always attributed the additional noise to the more powerful engine on the NG.

But last week I was on a 757 seated in row 27 and noticed something that may be a culprit to additional noise on the NG that I would like to share.

PHX-DFW. Initial cruise was at FL350. Encountered turbulence and went to 370 and later 390. Both times when we started to climb there was a noticable power increase. The interesting thing about it was the "rumble" seemed like it was coming from behind me, and of course I was already seated behind the powerplants.

Before I say anything else, I only have a basic understanding of how turbine aircraft engines work. That being said, I think some of the noise a lot of people are hearing is from the turbulent air exiting the engine and washing up against the fuselage. Now why would that have more of an effect on the NG vs. 2nd gen 737s and the Airbus narrow bodies? Well I have a theory on that as well. First look at how the power plants on the Airbus 320 family are mounted a lot lower and away from the fuselage than that of the 737. So obviously the airbus would have less of this "washing" effect that I have proposed.(I haven't flown on an Airbus in about 6 years, so I am going off that it is quieter from the above posts) And when comparing the NG to the 2nd gen 737, the NG engine has a larger diameter and maybe physically moves more air I would think than the 2nd gen engine would. And maybe that difference is enough that it would be noticable.

What I said above is just what I have noticed as airline passenger and is just a theory of mine. But I thought I would get it out there so one of the reputable posters can comment.

John


User currently offlineMauriceB From Netherlands, joined Aug 2004, 2490 posts, RR: 25
Reply 10, posted (9 years 5 months 2 weeks 3 days 14 hours ago) and read 2726 times:

flew the A320 and 737-300/800 both in 2 days, already 2 times this year.

737-300 is much more noisier than the 737-800, add to that that the 737-800 needs more power so more noise because its bigger, so the 737-800 is less noisier than the 737-300.

the A320 is by far the one with the best cabin... almost no noise


User currently offlineBrons2 From United States of America, joined Sep 2001, 3013 posts, RR: 4
Reply 11, posted (9 years 5 months 2 weeks 3 days 13 hours ago) and read 2701 times:

The 737NG is louder on takeoff than the 3/4/500 because the CFM56-7B has a much more pronounced buzzsaw on takeoff. However, the NG is quieter in cruise.

I've flown on NW's A319, which I understand is CFM56-5B powered but the cabin noise seemed about the same as the 737 to me. One thing I can say (which is no fault of the plane itself) is that NW's A32x seat pitch is terrible. WN is much better in that regard.



Firings, if well done, are good for employee morale.
User currently offlineSilver1SWA From United States of America, joined Mar 2004, 4811 posts, RR: 25
Reply 12, posted (9 years 5 months 2 weeks 3 days 12 hours ago) and read 2691 times:
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I sit in pretty much the same seat on all my WN flights. That would be windows seat, row 18 on the #2 side. The 733 and 73G sounds the same from that seat. I did recently do something way out of the ordinary and sat in front of the engines/wing on the 733. It does sound a lot different and yes is quieter from up there. But I haven't done it on a 737-700 yet so I can't compare the two.


ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5814 posts, RR: 11
Reply 13, posted (9 years 5 months 2 weeks 3 days 12 hours ago) and read 2696 times:

On the contrary, I find the 737NG to be quieter than the A320 with like engines. However, the IAE engines on the A320 were much more... Pratt and Whitney sounding to me. Like on the A330- check out flightlevel350's video of a USAir A330 taking off. Incredibly quiet.
I thought US's A319 with the CFM was noisy and cheap sounding. The 738 was quieter, IMO.
United's A320, however, was not harsh and unrefined to the ear like US's.

Granted, I think we are taking jet engine noise WAY TOO FAR with this thread, but, the above is my opinion.  Smile


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