N79969
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GE Engines On The MD-11

Fri May 10, 2002 11:22 pm

Does anyone know the purpose of the nozzles at the end of CF6 engines on MD-11? They don't appear on PW powered MD-11 nor do they appear on CF6-powered 747 or 767. They reappear on the A300/310/330 that are powered by CF6.

Also they appear on all engines available on the 777. I have wondered what determines when these exhaust nozzles are used or whether they inside the cowling or actually stick out.

 
JETPILOT
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Joined: Tue May 18, 1999 6:40 am

RE: GE Engines On The MD-11

Fri May 10, 2002 11:25 pm

Pics would help....

JET
 
N79969
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RE: GE Engines On The MD-11

Sat May 11, 2002 12:04 am

I'm talking about the black nozzle that extends from the tailpipe.

The PW-powered MD-11:

http://www.airliners.net/open.file/229240/M/


The GE-powered MD-11:

http://www.airliners.net/open.file/219881/M/
http://www.airliners.net/open.file/008755/M/

On the Airbus models (they're present):
http://www.airliners.net/open.file/225495/L/
http://www.airliners.net/open.file/212586/L/

On the Boeing (note the absence on these GE powered aircraft):

http://www.airliners.net/open.file/230764/L/
http://www.airliners.net/open.file/224243/L/
 
rmm
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RE: GE Engines On The MD-11

Sat May 11, 2002 12:29 am


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Photo © Peter Unmuth - Vienna Aviation Photography


 
N79969
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RE: GE Engines On The MD-11

Sat May 11, 2002 12:35 am

Thanks RMM, I could not do that on my machine for some reason.
 
rmm
Posts: 518
Joined: Sun Feb 04, 2001 10:34 am

RE: GE Engines On The MD-11

Sat May 11, 2002 12:36 am

From memory the exhaust nozzles are furnished by the airframe manufacturer, not the engine maker.

"On the Boeing (note the absence on these GE powered aircraft)"
Have a look at a 737-300+ nozzle.

"On the Airbus models (they're present)"
Have a look at a GE powered A320.

This seems to be a weird science, although no doubt there is some kind of reasoning behind it.

Rmm
 
N79969
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RE: GE Engines On The MD-11

Sat May 11, 2002 1:09 am

...and they are absent again on the A340-200/300. Any weird scientists on this forum?
 
LMP737
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Joined: Wed May 08, 2002 4:06 pm

RE: GE Engines On The MD-11

Sun May 12, 2002 4:05 pm

The nozzle you are reffering to is known as the exhaust plug. It's purpose is to form a convergent-divergent duct along with the exhasut nozzle to aid in the production of thrust.

THe PW 4460 on the MD-11 does have an exhaust plug, you just can't see it from the ground. The same goes for CF6 powered 747 and 767's. Other engines such as the RB-211 and V2500 fall into this category also.

Hope this bit of info helped.
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