747400sp
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Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 5:34 am

When the design for the 787 started, as the 7e7. I read that it was going the meet stage 4 noise regulation. I was reading aviation weekly and they group the 787 as a stage 3. I know the 787 has new engines so I can see it being stage 4, also aviation weekly could have been in a rush to group it. So I would like to know what noise stage will the 787 be.
 
a380900
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 6:22 am

What airliners are stage 4 today anyway? I think the A380 will be but what about flying airplanes?

[Edited 2005-03-12 22:36:38]
 
OldAeroGuy
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 6:41 am

All 777's can be certified to Stage 4 noise levels.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
2H4
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 8:29 am

Quoting OldAeroGuy (Reply 2):
All 777's can be certified to Stage 4 noise levels.

Do changes have to be made to the airframe or powerplants for 777 stage 4 certification, or is it a matter of paperwork? If changes do have to be made, what do they consist of?


2H4


Intentionally Left Blank
 
OldAeroGuy
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 9:02 am

Its paper work only. Stage 4 didn't exist for their initial cert's.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
a380900
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 9:06 am

I thought that noise wise, very powerful twin like the 777 were not doing that well. I thought 4 less powerful engines were much quieter than two huge ones.
 
OldAeroGuy
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 9:16 am

The main Twin advantage on departure is that it gets very high at the takeoff measurement point which offsets the fact that it cannot cutback as much as a Quad.

For Sideline, modern engine bypass ratios allow Twins to operate with little penalty compared to Quads.

On approach, Twins and Quads are about equal.

Nacelle technology plays an important part in meeting Stage 4/Chapter 4 requirements.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
Boeing Nut
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 10:47 am

It damn well better be or it will be a real short career.
I'm not a real aeronautical engineer, I just play one on Airliners.net.
 
ha763
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 10:53 am

Quoting A380900 (Reply 1):
What airliners are stage 4 today anyway? I think the A380 will be but what about flying airplanes?

The CFM56-7 and BR-715 on the 737NG and 717 meet the proposed stage 4 regulations. I don't know if any others currently in service currently meet the proposed regulations.
 
AerlingusEI521
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RE: Is The 787 A Stage 4 Airliner.

Sun Mar 13, 2005 9:55 pm

concerning the A32X family:
are the "new" airbus 32X ( i.e. those built recently) quieter than the earlier ones ( like the A320-100 or the firsts -200?). For instance, I know that the engines used for the 737NG are a bit different and quieter than those used for the 733-734-735... Does the same rule apply for the Airbus narrowbody family?

thanks!
 
Boeing7E7
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RE: Is The 787 A Stage 4 Airliner.

Wed Mar 16, 2005 4:40 pm

In a nut shell, yes it will exceed the proposed Stage 4 standards.
 
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RayChuang
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RE: Is The 787 A Stage 4 Airliner.

Wed Mar 16, 2005 11:03 pm

Given the extensive research done by GE Aero Engines and Rolls-Royce on reducing engine noise using acoustically-insulated engine nacelles and unusual nacelle designs, the 787 will easily meet not only the upcoming ICAO Stage 4 noise rules, but also easily meet the even stricter British Civil Aviation Authority Quota Count 2 noise abatement rules, also. That means the 787 could easily fly in and out of LHR and LGW on almost a 24-hour basis.  Smile
 
Orion737
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RE: Is The 787 A Stage 4 Airliner.

Wed Mar 16, 2005 11:09 pm

Stage 4? Soon jets will be permitted to make only equal noise to a hairdryer!

I like noisy jets like the 1-11, Trident and 732 not these whiners like the 321 which sounds like its crying when it takes off, mind you considering the size of the engines and the payload its carrying there is no suprise the 321 is crying!
 
cornish
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RE: Is The 787 A Stage 4 Airliner.

Wed Mar 16, 2005 11:15 pm

Quoting Orion737 (Reply 12):
like noisy jets like the 1-11, Trident and 732 not these whiners like the 321 which sounds like its crying when it takes off, mind you considering the size of the engines and the payload its carrying there is no suprise the 321 is crying!

I'm guessing here that you aren't one of the many people that live under the flight paths of major airports then.

I'm an aviation enthusiast, but I for one living close to an airport am glad for the progress we have made in quieter technology.

Likewise I can still remember getting off a Malev Tu154 in the past having sat in the rear row and ended up with my ears ringing for days afterwards  Smile
Just when I thought I could see light at the end of the tunnel, it was some B*****d with a torch bringing me more work
 
DAYflyer
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RE: Is The 787 A Stage 4 Airliner.

Wed Mar 16, 2005 11:51 pm

Quoting Orion737 (Reply 12):
Stage 4? Soon jets will be permitted to make only equal noise to a hairdryer

And possibly thrust to match that of a hairdryer.
One Nation Under God
 
Lemurs
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RE: Is The 787 A Stage 4 Airliner.

Thu Mar 17, 2005 3:18 am

Quoting Cornish (Reply 13):
I'm an aviation enthusiast, but I for one living close to an airport am glad for the progress we have made in quieter technology.

Amen! I understand the rush of listening to those screamers take off, but it's one thing to go out to an airfield to enjoy the sounds when you know you can drive home, and another to have to live under the flight path of say 3 major airports like EWR-LGA-JFK.

Besides, I'm even more impressed at how quiet they've gotten the crazy powerplants. Considering the monster that the GE90 is, it's downright pleasant to listen hum at TO power.
There are 10 kinds of people in the world; those who understand binary, and those that don't.
 
iowaman
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RE: Is The 787 A Stage 4 Airliner.

Thu Mar 17, 2005 4:33 am

Quoting DAYflyer (Reply 14):
Quoting Orion737 (Reply 12):
Stage 4? Soon jets will be permitted to make only equal noise to a hairdryer

And possibly thrust to match that of a hairdryer.

Haha the Avro engines pretty well have the thrust/sound/size of a hairdryer compared to a 747!