AlitaliaMD11
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Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 1:36 pm

I took this photo today of OH-LGH on finals for 31R at JFK and it appears to me that the right engine has a longer nozzle then the left engine. The right engine looks like one of the engines on Air Europa's A330-200.

http://i126.photobucket.com/albums/p82/JanuaryJFK/finn.jpg


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Photo © Jeroen Hribar - AirTeamImages



Is it just an optical allusion or...?
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LTU932
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 2:05 pm

It's most certainly not the CF6-80E1 which UX uses on their A330s. It's just an MD-11 with CF6-80 engines that have the longer engine spike.

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Photo © Sam Chui
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Photo © Phil Broad

I can't be more specific though. Anyone know which of the CF6-80s used on the MD-11 has the longer engine spike and which the shorter one?
 
TheCheese
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 2:34 pm

It's not an illusion, that one spike is shorter than the others.

Most likely, that particular engine was replaced by a spare they had on hand that doesn't have the longer spike on it.
 
Flyboy14295
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 2:42 pm

I'm guessing at the next maint. check it will be replaced to match the other spike?
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SlimChance
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 2:48 pm

So what's the functional difference between the two?
 
TheCheese
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 2:53 pm

Quoting SlimChance (Reply 4):
So what's the functional difference between the two?

Probably none.

I would hazard a guess that the one with the shorter spike is rated at the same thrust, though it may not have the exact same operating characteristics of the other two. Perhaps it is less fuel-efficient at the same thrust ratings.

I do not know for certain, ask in Tech/Ops for a definitive answer.
 
EFHK
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 3:26 pm

Quoting AlitaliaMD11 (Thread starter):
I took this photo today of OH-LGH

Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.
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LTU932
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 3:44 pm

Quoting EFHK (Reply 6):
Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.

Yup, that is OH-LGF, the same plane that was the Santa Claus logojet last year.
 
EFHK
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RE: Finnair MD-11 Engine Question (Pic)

Fri Dec 29, 2006 6:36 pm

Quoting LTU932 (Reply 7):
Yup, that is OH-LGF, the same plane that was the Santa Claus logojet last year.

Actually last year all MD-11s were Santa Claus logojets, this year only 3
MD-11s and the 1 A340-300.
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AlitaliaMD11
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RE: Finnair MD-11 Engine Question (Pic)

Sat Dec 30, 2006 12:22 am

Quoting LTU932 (Reply 1):
It's most certainly not the CF6-80E1 which UX uses on their A330s.

I knew that for sure, I was just reffering to the size of the length of the engine spike.

Quoting EFHK (Reply 6):
Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.

Sorry my bad, I got it right though when I uploaded the photo.

Thanks for clearing it up guys.
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Qantas744er
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RE: Finnair MD-11 Engine Question (Pic)

Sat Dec 30, 2006 12:44 am

To clear things up, the longer engine "spikes" are just a newer type of nozzle that they started using for the A330 and then also on other CF6-80 engines for the MD11. Of course not many MD11's got delivered with this nozzle but if all three engines are replaced with new ones fro GE, they will all recieve the new type of nozzle CF6-80.

Cheers Leo
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MD11Fanatic
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RE: Finnair MD-11 Engine Question (Pic)

Sat Dec 30, 2006 6:07 am

But can anyone tell me if there's any performance difference with this nozzle as opposed to the shorter one? I don't see why they'd invent a new one if the old one was blasting hot air fine too?
 
IFIXCF6
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RE: Finnair MD-11 Engine Question (Pic)

Sat Dec 30, 2006 3:00 pm

The performance difference is in economy of operation. The "spike", which is properly called an exhaust nozzle centerbody was lengthened to improve fuel burn. Remember the MD11 did not do as well as promised initially in this department, and part of the cause was GE not making their target. Hence a service bulletin when a better way has been found. But do you scrap expensive, albeit somewhat less effecient parts? Your CFO has answered...short and long centerbodies on the same A/C.

No CF6-80E is installed on anything other than an A330. It has a larger fan than a -80C2.

Mike

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