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Funny Cone Thingys On Md-11s  
User currently offlineBacardi182 From United States of America, joined Jan 2000, 1088 posts, RR: 1
Posted (14 years 7 months 3 weeks 4 days ago) and read 1073 times:

what are these cone shaped things that stick out of the back of the tail engine?

go here for a picture
http://www.airliners.net/open.file?id=68917
http://www.airliners.net/open.file?id=65148
http://www.airliners.net/open.file?id=63598
http://www.airliners.net/open.file?id=53291
notice how the cones vary in shape and size

why do some airplanes not have this cone?
http://www.airliners.net/open.file?id=57028
http://www.airliners.net/open.file?id=48607



9 replies: All unread, jump to last
 
User currently offlineDLMD-11 From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 7 months 3 weeks 3 days 23 hours ago) and read 910 times:

YES! I know exactly what they are.

They are only found on GE powered MD-11s - and it is the way you can tell if the MD-11 you are looking at has them or not. The engine in question is the GE CF6-80C2D1F.

The PW4056 engine that powers PW powered MD-11s do not have them (look at any picture of a Delta MD-11 for example.)

The cone is merely the specifics of the design of the engine!! It adds two inches to the total length of the aircraft from 200' 11" to 201' 1".

Hope this helps!!



User currently offlineMD11Nut From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 7 months 3 weeks 3 days 20 hours ago) and read 886 times:

DLMD-11,
You wrote:
"The PW4056 engine that powers PW powered MD-11s do not have them (look at any picture of a Delta MD-11 for example.)"

If I'm not mistaken the MD-11s that are powered by PW engines have either PW4460 or PW4462 only. Where do the 4056 come from? Thanks



User currently offlineDL_mech From United States of America, joined Feb 2000, 1968 posts, RR: 9
Reply 3, posted (14 years 7 months 3 weeks 3 days 18 hours ago) and read 865 times:

A 4056 engine is a Pratt&Whitney engine that is installed in a Boeing. A 4460 is a Douglas engine. They are all essentially the same engine except for thrust rating and they can be identified by the second number in their model. 0=Boeing, 1=Airbus, 4=McDonnellDouglas. A 4360 engine was previously built by P&W as a reciprocating engine installed in B-36s, B-50s and 377 Stratocruiser.


This plane is built to withstand anything... except a bad pilot.
User currently offline747-600X From United States of America, joined Jan 2000, 2795 posts, RR: 15
Reply 4, posted (14 years 7 months 3 weeks 3 days 18 hours ago) and read 859 times:

To actually display the pictures, just type < then PHOTOID then : then THE NUMBER of the picture then >. For anyone who doesn't want to go piling through the photos but see the aircraft mentioned,


Click for large version
Click here for full size photo!

Photo © Airnikon


Click for large version
Click here for full size photo!

Photo © David Knudsen


Click for large version
Click here for full size photo!

Photo © Airnikon


Click for large version
Click here for full size photo!

Photo © Aki Kaunisto


Click for large version
Click here for full size photo!

Photo © Philippe Gindrat


Click for large version
Click here for full size photo!

Photo © Daniel Lefranc





"Mental health is reality at all cost." -- M. Scott Peck, 'The Road Less Traveled'
User currently offlineDLMD-11 From , joined Dec 1969, posts, RR:
Reply 5, posted (14 years 7 months 3 weeks 3 days 8 hours ago) and read 843 times:

Apologies;

I got the exact engine type wrong - is the PW4056 installed on the 767-300? Because I may well have gotten the two mixed up!

Sorry!

However I was right about the GE engines having the cone and the PW engine not, correct?



DLMD-11.


User currently offlineMD-90 From United States of America, joined Jan 2000, 8508 posts, RR: 12
Reply 6, posted (14 years 7 months 3 weeks 2 days 23 hours ago) and read 833 times:

I may be wrong, but I'm pretty sure that the Delta's MD-11s are GE powered and that it's the PW engines that have the extended cone. I could be wrong, but that's what I've read. I wonder why some of the PW engines have the long cone and the others have the shorter cone? I know that you can't see the engines in these two pictures but they're my favorite Delta MD-11 pics.

Click for large version
Click here for full size photo!

Photo © Kazutaka Yagi



Click for large version
Click here for full size photo!

Photo © Kazutaka Yagi



User currently offlineBbinchi From , joined Dec 1969, posts, RR:
Reply 7, posted (14 years 7 months 3 weeks 2 days 22 hours ago) and read 829 times:

I thought that DL had some MD-11's with P&W engines and others with GE (like I had been told they do with their 767-300ER's). Not true?


User currently offlineDLMD-11 From , joined Dec 1969, posts, RR:
Reply 8, posted (14 years 7 months 3 weeks 2 days 22 hours ago) and read 830 times:

In reality;

The majority of Delta's MD-11s are powered by the PW engine, and it is DEFINATELY the GE engine that has the cone coming out of the engines.

The only Delta MD-11s that WERE powered by GE engines were two that were in the MDC test program - they were on lease from an aviation lessor to Delta for a while, while the airline waited for the deliveries. Once they got their own, the two GE powered aircraft were returned to the lessor.

The reason that Delta got these aircraft was because they were originally destined for Air Europe (the British one) but that airline went belly up shortly before construction began on the airframes in question. Delta subsequently took the opportunity at hand to take early delivery of the new type. These planes were registered N891DL and N892DL.

The aircraft registered N801DL thru N815DL (Delta's current fifteen aircraft) are all powered by Pratt & Whitney PW4000s.

Hope this clears up some of the confusion.



DLMD-11.


User currently offlineDLMD-11 From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 7 months 3 weeks 2 days 21 hours ago) and read 826 times:

Slight correction to my previous post:

The current 15 MD-11s in Delta's fleet are registered N801DE to N815DE, not N801DL to N815DL as previously written.



DLMD-11.


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