LH707330
Topic Author
Posts: 1612
Joined: Fri Jun 15, 2012 11:27 pm

P&W Vacuum Cleaner Noise At Idle

Fri Aug 31, 2012 11:18 pm

Forgive me if this has been covered before, but what causes the vacuum cleaner noise in P&W turbofans? I was at Sea-Tac yesterday, and noticed a DL 757-200 (2037), Condor 767-300ER (4060), and KL 744F (4060) all make it. I've heard UA 772 (4090) make this noise in the past as well, and I have not heard it from RR or GE engines.
 
N243NW
Posts: 1597
Joined: Thu Jul 24, 2003 4:29 am

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 4:44 am

If it's what I think you're talking about (a constant resonant "woo" sound), then the CF6 tends to do it as well.

Is it the sound that you can hear starting at :30 in this video? http://www.youtube.com/watch?v=oBaYs2NjCQU

Sounds like combustor tone to me.
B-52s don't take off. They scare the ground away.
 
my235
Posts: 94
Joined: Mon Mar 23, 2009 10:21 pm

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 5:17 am

I hear it all the time when the A300F use break-away thrust after being pushed back. They have P&W's. Love it!
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 2:26 pm

Quoting N243NW (Reply 1):
Sounds like combustor tone to me.

Agreed. This isn't limited to P&W...the Trent1000 has an epic bass combustor tone during startup when it's cold outside.

Tom.
 
User avatar
Aaron747
Posts: 8560
Joined: Thu Aug 07, 2003 2:07 am

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 4:01 pm

A video I took a few years back that dramatically illustrates the point whenever this thread topic comes up  http://www.youtube.com/watch?v=UuLMJXemd-Y
If you need someone to blame / throw a rock in the air / you'll hit someone guilty
 
9VSIO
Posts: 654
Joined: Tue Dec 19, 2006 5:00 pm

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 4:55 pm

When I saw the title of this thread, I thought that Pratt & Whitney had made a vacuum cleaner! Imagine my disappointment...
Me: (Lining up on final) I shall now select an aiming point. || Instructor: Well, I hope it's the runway...
 
N243NW
Posts: 1597
Joined: Thu Jul 24, 2003 4:29 am

RE: P&W Vacuum Cleaner Noise At Idle

Sat Sep 01, 2012 9:45 pm

Quoting tdscanuck (Reply 3):
the Trent1000 has an epic bass combustor tone during startup when it's cold outside.

So does the GE90-110/115B at pretty much any temperature. You can often hear it across the airport, even through terminal windows!
B-52s don't take off. They scare the ground away.
 
User avatar
longhauler
Posts: 5138
Joined: Sat Mar 06, 2004 12:00 am

RE: P&W Vacuum Cleaner Noise At Idle

Sun Sep 02, 2012 12:55 am

The DC-8-62/63 also make the same noise. I always loved it.

It starts at 1:10 in this video:

http://www.youtube.com/watch?v=lRaXQUXOUJA
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!
 
planejamie
Posts: 564
Joined: Thu Sep 15, 2011 8:41 pm

RE: P&W Vacuum Cleaner Noise At Idle

Sun Sep 02, 2012 10:08 am

I think the RR Trent 700 and 800 has a similar "woo"-ing sound when above idle (about 30-50% N1) you notice it when they spool up for take off or when giving a little bit more power into taxiing. I never knew the PWs made that noise!

Quoting 9VSIO (Reply 5):
When I saw the title of this thread, I thought that Pratt & Whitney had made a vacuum cleaner! Imagine my disappointment...

Would be awesome, it could be shaped like a jet engine

Who is online

Users browsing this forum: tb727 and 21 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos