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Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 9:57 am
by DC10Tony
I could be wrong, but I'm going to say the RR Trent 722s on the A330, they're pretty quiet, for a jet engine.

What's your opinion?

RE: Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 10:16 am
by bio15
I know there are some real quiet CFMs out there, not sure which though.
-bio

RE: Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 11:11 am
by wilcharl
not overly technical topic but my vote is for the BR-715

RE: Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 11:13 am
by Metwrench
How about breaking that down to different size A/C or engine thrust ratings?

Anyhow, my vote would go to the BAe 146. The numbers elude me, but it has aprox 65K MTOW with 4 7K lb thrust ALF 502's. It is indeed a quiet A/C.

RE: Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 12:30 pm
by B1C17L1011
I believe that the V2500's on the MD-90 are the quietest jet engines.

RE: Quietest Jet Engine Ever

Posted: Thu Apr 18, 2002 12:54 pm
by IMissPiedmont
I don't know the absolute quietest engine. That would have to be measured on a test stand I suppose.
I can say that the quietest takeoff I ever heard was a UPS DC-8-70 taking off from ONT in 1986. I was about 100 meters from the end of the runway and could hear not much more than a "whoosh" sound. On another note, that airplane rotated in about 700 meters. Must have been empty. Impressive.

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 2:42 am
by JETPILOT
The reason the DC8 was so quiet was because it was most likely doing a reduced power takeoff.

JET

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 3:43 am
by wilcharl
the queitsest engine is one not running.... even a rolls royce avon is quiet when its not running... :-P

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 8:37 am
by fanoftristars
I thought I read somewhere that it was the RR Trent on the 777???

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 9:51 am
by boeingnut
I think that the quietest engine while operating (I was going to be a smarta** and say an engine that isnt running, but that was already taken) is the RR Trent with the Boeing-RR jointly designed "scalloped" nacelle. Boeing made a big hoohaw over that a few months ago.

Is that design going to be part of the new 744XQLR?

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 9:01 pm
by DC10Tony
Boeingnut-

I know what you're talking about, but that engine with the scalloped nacelle was for the 777 I think.

I saw it on the Boeing website a few months ago, but I've been trying to find it on their site, without much luck, I guess they must have taken the news about it off the site.

RE: Quietest Jet Engine Ever

Posted: Fri Apr 19, 2002 10:00 pm
by boeingnut
DC10Tony:

Yeah, I know they used a 777 for the testbed for the scalloped nacelle. But since the new 744QXLR is going to get Trents instead of RB211s, I was thinking that it would be quite easy to make that technology work on this new a/c, as well

And yeah, Ive been having a hard time finding that picture too..

-Bnut

RE: Quietest Jet Engine Ever

Posted: Sun Apr 21, 2002 6:07 am
by Guest
I'm pretty sure the quietest jet engine I've heard are the General Electric CF34-3B1 on the CRJ-200 models. Almost impressively quiet.

Loudest (at least I've been around) would be the Pratt & Whitney JT8D-2.. on the MD-80.

Cameron

RE: Quietest Jet Engine Ever

Posted: Sun Apr 21, 2002 6:09 am
by Guest
P.S. Just wait until Eclipse fits the Williams EJ22 to the first Eclipse 500 jet! That will be some quite stuff! (probably quieter than some turbocharged piston-powered twins)

Cameron.

RE: Quietest Jet Engine Ever

Posted: Sun Apr 21, 2002 9:28 am
by Metwrench
The "LOUDEST"?

Pound per thrust has to be any CJ 610 turbojet, Bar None!!!!


COOL!!!!!!!

RE: Quietest Jet Engine Ever

Posted: Sun Apr 21, 2002 9:47 am
by ejaymd11
The V2500 on the MD-90, and the BR715 on the 717, are the quitest in there class. The CRJ's are pretty quite, and the presidents 757 with the PW's took off from my airport recently and I wasn't to far away and it took of from a short runway and I could barely hear it.

My Opinnion
Ejay MD-11

RE: Quietest Jet Engine Ever

Posted: Sun Apr 21, 2002 11:24 am
by miles_mechanic
well I would have to agree with Metwrench about the BAe 146 being really quiet, and possibly the Boeing 737-700 that flies into my airport, as for the noisiest take off I have heard, it would have to be the Rolls Royce Spey powered Fokker F-28, they sound just like a fighter jet when they wind them up.

Miles

RE: Quietest Jet Engine Ever

Posted: Mon Apr 22, 2002 6:05 am
by UPS763
Quiet= BAE 146

Loud=732

RE: Quietest Jet Engine Ever

Posted: Mon Apr 22, 2002 6:36 am
by kaddyuk
Rolls Royce is working with Boeing to develop an engine for a 777-200 that reduces its Sound Footprint by about 5 or 6 DBs. It does this by having a smooth wavy edge on the Back of the Engines cone


RE: Quietest Jet Engine Ever

Posted: Tue Apr 23, 2002 5:25 am
by boeingmd82
Almost missed my flight the other day because I was waiting in the Hawaiian lounge in Hilo and I didn't hear the 717 arrive at the gate just a few feet away! The BR715 gets my vote.

BMD82

RE: Quietest Jet Engine Ever

Posted: Wed Apr 24, 2002 3:17 pm
by FlightTest
In regard to the Williams EJ22, I hope it is quieter than the FJ44-2A that I work on. Those things are LOUD.

RE: Quietest Jet Engine Ever

Posted: Thu Apr 25, 2002 6:53 am
by Jetpilot500
Boeing 717 is the quitest airliner ever built. Exceed planned Stage 4 noise requirements.

RE: Quietest Jet Engine Ever

Posted: Thu Apr 25, 2002 10:29 am
by Guest
FlightTest:

They sure are marketing the EJ22 to be quiet!! It'll be interesting to see the results of this new stir-welded fuselage process that they're trying to get through FAA cirt.

Cameron

RE: Quietest Jet Engine Ever

Posted: Thu Apr 25, 2002 1:55 pm
by jetdoctor
I do believe reading about the ultra quiet Rolls Royce Trent fitted to a B777 in Aviation Week Magazine (Unsure of the date, but it was recent)

I will have to add an engine that hasn't been mentioned yet. The Rolls Royce AE3007 engine on the Embraer regional jets. In the cockpit at idle, you have to look at the EICAS to see if they are even running. I think most poeple don't realize the engine is so quiet because the stupid Hamilton Sundstrand C11 and C14 APU sounds like a rocket, and probably has more of a noise footprint than the engines do!!

RT

RE: Quietest Jet Engine Ever

Posted: Fri Apr 26, 2002 10:28 am
by wannabe
Whatever engines the Air Canada 767 Gimili Glider had.