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Is The 787 A Stage 4 Airliner.  
User currently offline747400sp From United States of America, joined Aug 2003, 3484 posts, RR: 2
Posted (9 years 4 months 2 weeks 17 hours ago) and read 5321 times:

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.

16 replies: All unread, jump to last
 
User currently offlineA380900 From France, joined Dec 2003, 1101 posts, RR: 1
Reply 1, posted (9 years 4 months 2 weeks 16 hours ago) and read 5204 times:

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]

User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3476 posts, RR: 67
Reply 2, posted (9 years 4 months 2 weeks 15 hours ago) and read 5140 times:

All 777's can be certified to Stage 4 noise levels.


Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 3, posted (9 years 4 months 2 weeks 14 hours ago) and read 5006 times:
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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
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3476 posts, RR: 67
Reply 4, posted (9 years 4 months 2 weeks 13 hours ago) and read 4939 times:

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
User currently offlineA380900 From France, joined Dec 2003, 1101 posts, RR: 1
Reply 5, posted (9 years 4 months 2 weeks 13 hours ago) and read 4927 times:

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.

User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3476 posts, RR: 67
Reply 6, posted (9 years 4 months 2 weeks 13 hours ago) and read 4902 times:

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
User currently offlineBoeing Nut From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 4 months 2 weeks 11 hours ago) and read 4852 times:

It damn well better be or it will be a real short career.

User currently offlineHa763 From United States of America, joined Jan 2003, 3632 posts, RR: 5
Reply 8, posted (9 years 4 months 2 weeks 11 hours ago) and read 4855 times:
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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.


User currently offlineAerlingusEI521 From France, joined Mar 2005, 17 posts, RR: 0
Reply 9, posted (9 years 4 months 2 weeks ago) and read 3985 times:

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!


User currently offlineBoeing7E7 From , joined Dec 1969, posts, RR:
Reply 10, posted (9 years 4 months 1 week 4 days 5 hours ago) and read 2289 times:

In a nut shell, yes it will exceed the proposed Stage 4 standards.

User currently offlineRayChuang From United States of America, joined Jun 2000, 7985 posts, RR: 5
Reply 11, posted (9 years 4 months 1 week 3 days 23 hours ago) and read 2202 times:

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

User currently offlineOrion737 From , joined Dec 1969, posts, RR:
Reply 12, posted (9 years 4 months 1 week 3 days 23 hours ago) and read 2187 times:

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!


User currently offlineCornish From United Kingdom, joined Feb 2005, 8187 posts, RR: 54
Reply 13, posted (9 years 4 months 1 week 3 days 23 hours ago) and read 2174 times:

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
User currently offlineDAYflyer From United States of America, joined Sep 2004, 3807 posts, RR: 3
Reply 14, posted (9 years 4 months 1 week 3 days 22 hours ago) and read 2140 times:

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
User currently offlineLemurs From United States of America, joined Mar 2005, 1439 posts, RR: 4
Reply 15, posted (9 years 4 months 1 week 3 days 19 hours ago) and read 2038 times:

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.
User currently offlineIowaman From United States of America, joined May 2004, 4364 posts, RR: 6
Reply 16, posted (9 years 4 months 1 week 3 days 18 hours ago) and read 1981 times:
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FORUM MODERATOR

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!



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