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DC10Tony
Topic Author
Posts: 991
Joined: Tue May 29, 2001 9:51 am

Quietest Jet Engine Ever

Thu Apr 18, 2002 9:57 am

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?
 
bio15
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

RE: Quietest Jet Engine Ever

Thu Apr 18, 2002 10:16 am

I know there are some real quiet CFMs out there, not sure which though.
-bio
 
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wilcharl
Posts: 1176
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RE: Quietest Jet Engine Ever

Thu Apr 18, 2002 11:11 am

not overly technical topic but my vote is for the BR-715
 
Metwrench
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Joined: Fri Aug 17, 2001 11:25 am

RE: Quietest Jet Engine Ever

Thu Apr 18, 2002 11:13 am

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.
 
B1C17L1011
Posts: 96
Joined: Fri Jun 29, 2001 12:42 am

RE: Quietest Jet Engine Ever

Thu Apr 18, 2002 12:30 pm

I believe that the V2500's on the MD-90 are the quietest jet engines.
 
IMissPiedmont
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RE: Quietest Jet Engine Ever

Thu Apr 18, 2002 12:54 pm

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.
The day you stop learning is the day you should die.
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 2:42 am

The reason the DC8 was so quiet was because it was most likely doing a reduced power takeoff.

JET
 
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wilcharl
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RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 3:43 am

the queitsest engine is one not running.... even a rolls royce avon is quiet when its not running... :-P
 
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fanoftristars
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RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 8:37 am

I thought I read somewhere that it was the RR Trent on the 777???
"FLY DELTA JETS"
 
boeingnut
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Joined: Tue Oct 30, 2001 5:46 am

RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 9:51 am

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?
Excuse me, but what does God need with a starship?
 
DC10Tony
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RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 9:01 pm

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.
 
boeingnut
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RE: Quietest Jet Engine Ever

Fri Apr 19, 2002 10:00 pm

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
Excuse me, but what does God need with a starship?
 
Guest

RE: Quietest Jet Engine Ever

Sun Apr 21, 2002 6:07 am

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
 
Guest

RE: Quietest Jet Engine Ever

Sun Apr 21, 2002 6:09 am

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.
 
Metwrench
Posts: 715
Joined: Fri Aug 17, 2001 11:25 am

RE: Quietest Jet Engine Ever

Sun Apr 21, 2002 9:28 am

The "LOUDEST"?

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


COOL!!!!!!!
 
ejaymd11
Posts: 180
Joined: Thu Feb 22, 2001 8:04 am

RE: Quietest Jet Engine Ever

Sun Apr 21, 2002 9:47 am

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
 
miles_mechanic
Posts: 132
Joined: Sat Sep 08, 2001 4:30 pm

RE: Quietest Jet Engine Ever

Sun Apr 21, 2002 11:24 am

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
 
UPS763
Posts: 195
Joined: Wed Nov 14, 2001 7:00 am

RE: Quietest Jet Engine Ever

Mon Apr 22, 2002 6:05 am

Quiet= BAE 146

Loud=732
 
kaddyuk
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RE: Quietest Jet Engine Ever

Mon Apr 22, 2002 6:36 am

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

Whoever said "laughter is the best medicine" never had Gonorrhea
 
boeingmd82
Posts: 232
Joined: Thu Jun 21, 2001 11:14 am

RE: Quietest Jet Engine Ever

Tue Apr 23, 2002 5:25 am

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
 
FlightTest
Posts: 35
Joined: Wed Apr 24, 2002 4:01 am

RE: Quietest Jet Engine Ever

Wed Apr 24, 2002 3:17 pm

In regard to the Williams EJ22, I hope it is quieter than the FJ44-2A that I work on. Those things are LOUD.
 
Jetpilot500
Posts: 78
Joined: Wed Nov 29, 2000 1:54 am

RE: Quietest Jet Engine Ever

Thu Apr 25, 2002 6:53 am

Boeing 717 is the quitest airliner ever built. Exceed planned Stage 4 noise requirements.
 
Guest

RE: Quietest Jet Engine Ever

Thu Apr 25, 2002 10:29 am

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
 
jetdoctor
Posts: 220
Joined: Wed Aug 08, 2001 2:16 pm

RE: Quietest Jet Engine Ever

Thu Apr 25, 2002 1:55 pm

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
Break ground, and head into the wind. Don't break wind and head into the ground.
 
wannabe
Posts: 652
Joined: Wed Jun 30, 1999 3:37 am

RE: Quietest Jet Engine Ever

Fri Apr 26, 2002 10:28 am

Whatever engines the Air Canada 767 Gimili Glider had.

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