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GE Engines On The MD-11  
User currently offlineN79969 From , joined Dec 1969, posts, RR:
Posted (12 years 2 months 2 weeks 5 days 15 hours ago) and read 4029 times:

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.



7 replies: All unread, jump to last
 
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 1, posted (12 years 2 months 2 weeks 5 days 15 hours ago) and read 3992 times:

Pics would help....

JET


User currently offlineN79969 From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 2 months 2 weeks 5 days 14 hours ago) and read 3980 times:

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/


User currently offlineRmm From Australia, joined Feb 2001, 524 posts, RR: 1
Reply 3, posted (12 years 2 months 2 weeks 5 days 13 hours ago) and read 3974 times:


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Photo © Gregg Stansbery



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Photo © Jonathan Derden



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Photo © Jose Luiz Junior



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Photo © Joe Pries



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Photo © Jason Taperell



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Photo © Peter Unmuth - Vienna Aviation Photography




User currently offlineN79969 From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 2 months 2 weeks 5 days 13 hours ago) and read 3966 times:

Thanks RMM, I could not do that on my machine for some reason.

User currently offlineRmm From Australia, joined Feb 2001, 524 posts, RR: 1
Reply 5, posted (12 years 2 months 2 weeks 5 days 13 hours ago) and read 3968 times:

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


User currently offlineN79969 From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 2 months 2 weeks 5 days 13 hours ago) and read 3956 times:

...and they are absent again on the A340-200/300. Any weird scientists on this forum?

User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 7, posted (12 years 2 months 2 weeks 3 days 22 hours ago) and read 3908 times:

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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