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FoxtrotSierra
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The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 7:40 am

After watching several videos aboard WN's 737MAX, I noticed a rumble very similar to the tune of GE90's on startup. I have also heard this on the 787 as well, so I am pretty sure this is a GE phenomenon. Anyway, I found it interesting to note that soon, all Boeing aircraft including 737's will have the signature GE startup rumble which used to be unique to just the 777.

Startup at 8:20

https://www.youtube.com/watch?v=cHUSqPjr3Go
 
Momo1435
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 7:44 am

All Boeing aircraft except for the RR powered 787s of course.
 
oldannyboy
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 10:10 am

I love that rumble! Not as 'mighty' as the one of the gargantuan GE90, but still pretty impressive!
Too bad Boeing have not invested in more effective noise deadening materials for the MAX...I feel this aircraft is still a tad too noisy inside, especially given how quiet the new engines are...
 
oldannyboy
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 10:11 am

Momo1435 wrote:
All Boeing aircraft except for the RR powered 787s of course.


Even the newest RR products are sporting the characteristic high-pitched whine on spool-up.... I love that too!
 
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Narfish641
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 12:19 pm

It does sound like the GE90 I agree. It has that very intimidating sound to it. I also hear a little bit of the 737NG when the gearbox for the fan blades start up.
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Narfish641
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 12:21 pm

Momo1435 wrote:
All Boeing aircraft except for the RR powered 787s of course.



I might be thinking wrong, but I think the 767 has a quieter engine start for some reason, hearing it in the video. Its like you don't hear anything until the engine is ignited.
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767333ER
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 3:22 pm

And the A320 and C919 (will) also sound the same starting up. The LEAP sounds a little more like a GEnx to me though.
Narfish641 wrote:
Momo1435 wrote:
All Boeing aircraft except for the RR powered 787s of course.



I might be thinking wrong, but I think the 767 has a quieter engine start for some reason, hearing it in the video. Its like you don't hear anything until the engine is ignited.

On the 767 I’ve only experienced the CF6 and PW4000, but the reason y don’t hear them until lightoff on the videos is because the noise they make is so deep that the mic doesn’t pick it up. The CF6 though doesn’t make that much noise until lightoff, but the noise it does is very deep. All engine star noises on the 767 are quieter than the newer GE engines.
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flyboy80
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 3:24 pm

I'm curious if the MAX is as loud behind the wing where the exhaust stream is, has anyone experienced it? YouTube vids are hard to tell given the level of noise and what's actually picked up.
 
arcticcruiser
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 3:31 pm

Narfish641 wrote:
It does sound like the GE90 I agree. It has that very intimidating sound to it. I also hear a little bit of the 737NG when the gearbox for the fan blades start up.


Fan blades. Gearbox? CFM Leap?
 
GalaxyFlyer
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 4:05 pm

Sub-idle vibration range. When the rotating mass converts from geometric balance (think shaft) to center of mass balance.
 
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Narfish641
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 5:28 pm

arcticcruiser wrote:
Narfish641 wrote:
It does sound like the GE90 I agree. It has that very intimidating sound to it. I also hear a little bit of the 737NG when the gearbox for the fan blades start up.


Fan blades. Gearbox? CFM Leap?


In a more detailed way, when the engine begins to start it sounds almost identical when a CFM56 on a 737NG starts its engines. Then it sounds like the deep rumble of the GE90 as it starts spooling up, then when the engine ignites, it sound like the GEnx when lit.
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arcticcruiser
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 5:49 pm

Narfish641 wrote:
arcticcruiser wrote:
Narfish641 wrote:
It does sound like the GE90 I agree. It has that very intimidating sound to it. I also hear a little bit of the 737NG when the gearbox for the fan blades start up.


Fan blades. Gearbox? CFM Leap?


In a more detailed way, when the engine begins to start it sounds almost identical when a CFM56 on a 737NG starts its engines. Then it sounds like the deep rumble of the GE90 as it starts spooling up, then when the engine ignites, it sound like the GEnx when lit.


Whatever. But the Leap is NOT a geared fan engine.
 
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Narfish641
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 7:22 pm

arcticcruiser wrote:
Narfish641 wrote:
arcticcruiser wrote:

Fan blades. Gearbox? CFM Leap?


In a more detailed way, when the engine begins to start it sounds almost identical when a CFM56 on a 737NG starts its engines. Then it sounds like the deep rumble of the GE90 as it starts spooling up, then when the engine ignites, it sound like the GEnx when lit.


Whatever. But the Leap is NOT a geared fan engine.



Thanks for the correction.
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kabq737
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 8:34 pm

It’s really high pitched on takeoff.
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KanaHawaii
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Fri Oct 13, 2017 9:39 pm

The high pitched sound also happens on the Trent 700 engine. Hawaiian Air has those on the A330's and you hear that whine all the time upon take off.
 
trnswrld
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sat Oct 14, 2017 2:04 am

I am very curious to see if the max will be more quiet from the stand point of someone being on the ground and it flying over. Reason I ask this is the 737-800 (and maybe other NG models), is unusually loud when flying over. Let me describe my situation. So I live west of Chicago out near Naperville. I am directly under the inbound stream from the southwest and ORD inbounds fly over at 10,000 all day everyday. The 737-800 is freakishly noisy!! I'm not sure if it's an engine or airframe/aerodynamic thing or a combo of both, but it is significantly louder going over than ANY other modern aircraft. I even wanted to start my own thread on this subject but have never bothered. I will have to pay attention once the max starts flying into ORD. Sorry I sort of went off topic, but figured it's a close enough thread to talk about this in.

On a somewhat related story, another unique noise I hear from the same spot is the Airbus 319/320/321 series aircraft occasionally have a very unique sound that I think is related to the change of power settings around 10,000ft. Possibly the reduction of power to slow to 250kts at 10. Hard to describe the sound, but it's a very unique noise that's odd enough to even catch the attention of a non-aviation enthusiast. This is also from the ground and is heard just prior to the aircraft passing over. Almost sounds like the noise that's made if you blow into a beer bottle just right.
 
Redbellyguppy
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sat Oct 14, 2017 9:11 am

That's the sound of Airbus slats coming out.
 
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767333ER
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sat Oct 14, 2017 10:54 pm

arcticcruiser wrote:
Narfish641 wrote:
arcticcruiser wrote:

Fan blades. Gearbox? CFM Leap?


In a more detailed way, when the engine begins to start it sounds almost identical when a CFM56 on a 737NG starts its engines. Then it sounds like the deep rumble of the GE90 as it starts spooling up, then when the engine ignites, it sound like the GEnx when lit.


Whatever. But the Leap is NOT a geared fan engine.

Gearbox in this case refers to the linkage that connects the starter/hydraulic pump/fuel pump or IDG to the turbine.
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Runway28L
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sun Oct 15, 2017 12:53 am

Does the MAX have the humming sound that the NGs do when they're on the ground or parked at the gate?

I haven't been able to tell from the few videos I've seen.
 
barney captain
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sun Oct 15, 2017 2:38 am

The start-up on the MAX is also quite long - easily twice to three times as long as the NG.
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Narfish641
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sun Oct 15, 2017 4:17 am

trnswrld wrote:
I am very curious to see if the max will be more quiet from the stand point of someone being on the ground and it flying over. Reason I ask this is the 737-800 (and maybe other NG models), is unusually loud when flying over. Let me describe my situation. So I live west of Chicago out near Naperville. I am directly under the inbound stream from the southwest and ORD inbounds fly over at 10,000 all day everyday. The 737-800 is freakishly noisy!! I'm not sure if it's an engine or airframe/aerodynamic thing or a combo of both, but it is significantly louder going over than ANY other modern aircraft. I even wanted to start my own thread on this subject but have never bothered. I will have to pay attention once the max starts flying into ORD. Sorry I sort of went off topic, but figured it's a close enough thread to talk about this in.

On a somewhat related story, another unique noise I hear from the same spot is the Airbus 319/320/321 series aircraft occasionally have a very unique sound that I think is related to the change of power settings around 10,000ft. Possibly the reduction of power to slow to 250kts at 10. Hard to describe the sound, but it's a very unique noise that's odd enough to even catch the attention of a non-aviation enthusiast. This is also from the ground and is heard just prior to the aircraft passing over. Almost sounds like the noise that's made if you blow into a beer bottle just right.



I can kinda relate to your situation.
I live about 30 mins. from the airport (Use to since were moving), and depending on how the pattern is on the runways they take off and land, they are about a good 7,000 ft. or lower during takeoff. To me the 737 Next Gens are not that loud at take off, nor are the Airbus A320 family aircrafts. I will say however that the loudest would be the 777 aircrafts that passover. Always rumbling by, and no matter what you do you can't really drown the noise out. The irony of the GE90s XD!


But about the 737 MAX getting back to topic, I am willing to fly the MAX one day, not sure how quiet it is in the cabin vs. the cabin on the 737NG. Nor do I know how quiet it is at a standing view point, but I'll be the judge whenever I feel like spotting next week or flying next year for a second time lol.
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CarlosSi
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Sun Oct 15, 2017 7:49 pm

A lot of naysayers complain about people saying they sound the same to the 77GE; nay to them! Does JT8D on an MD80 sound like GE90? How about a CR7? a320? e175?

trnswrld wrote:
I am very curious to see if the max will be more quiet from the stand point of someone being on the ground and it flying over. Reason I ask this is the 737-800 (and maybe other NG models), is unusually loud when flying over. Let me describe my situation. So I live west of Chicago out near Naperville. I am directly under the inbound stream from the southwest and ORD inbounds fly over at 10,000 all day everyday. The 737-800 is freakishly noisy!! I'm not sure if it's an engine or airframe/aerodynamic thing or a combo of both, but it is significantly louder going over than ANY other modern aircraft. I even wanted to start my own thread on this subject but have never bothered. I will have to pay attention once the max starts flying into ORD. Sorry I sort of went off topic, but figured it's a close enough thread to talk about this in.


You haven't heard many e170s taking off or have noticed them; those are significantly and noticeably louder than most modern aircraft (aside from the MD80s under retirement, which aren't really modern anymore). If I think it's an MD80 but I'm not sure, it's usually an e170.
 
parmelbe
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Mon Oct 16, 2017 1:09 pm

Oh, good, so it's not just me. I've noticed this as well. There's a distinct rumble on startup once the fan gets going then once it's running there's a subtle whistle over the rest of the noise. It's really neat. I've been working the MAX for a couple of weeks now and I still haven't gotten over it.

barney captain wrote:
The start-up on the MAX is also quite long - easily twice to three times as long as the NG.


Indeed. On the NG's both engines will be running by the end of a usual push, before the ramp drives away, but now they'll just be starting up #1 by that time.

trnswrld wrote:
I am very curious to see if the max will be more quiet from the stand point of someone being on the ground and it flying over.


Can't really speak to this, but from the ramp it is noticeably quieter. I haven't measured it but it feels like almost 30%-40% quieter. I've stood 20-30ft away from an idling MAX and comfortably taken off my hearing protection (still wouldn't recommend doing this, obviously.)
ALL views and opinions expressed are mine ONLY and are NOT representative of those of Southwest Airlines
 
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767333ER
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Re: The 737MAX has a GE90 style startup noise (but quieter)

Mon Oct 16, 2017 4:37 pm

CarlosSi wrote:
A lot of naysayers complain about people saying they sound the same to the 77GE; nay to them! Does JT8D on an MD80 sound like GE90? How about a CR7? a320? e175?

trnswrld wrote:
I am very curious to see if the max will be more quiet from the stand point of someone being on the ground and it flying over. Reason I ask this is the 737-800 (and maybe other NG models), is unusually loud when flying over. Let me describe my situation. So I live west of Chicago out near Naperville. I am directly under the inbound stream from the southwest and ORD inbounds fly over at 10,000 all day everyday. The 737-800 is freakishly noisy!! I'm not sure if it's an engine or airframe/aerodynamic thing or a combo of both, but it is significantly louder going over than ANY other modern aircraft. I even wanted to start my own thread on this subject but have never bothered. I will have to pay attention once the max starts flying into ORD. Sorry I sort of went off topic, but figured it's a close enough thread to talk about this in.


You haven't heard many e170s taking off or have noticed them; those are significantly and noticeably louder than most modern aircraft (aside from the MD80s under retirement, which aren't really modern anymore). If I think it's an MD80 but I'm not sure, it's usually an e170.

Some people say all these new engines sound exactly like GE90 when spooling up or whatever, but in reality they don’t, they sound exactly how I excepted they would. Very wide chord fan and medium sized fan. As for noise, the E175 makes quite a bit, but the 737NG is still significantly louder and is the loudest thing to fly over my house other than the 737 classic.
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