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Need Help: Engine Differences On 777's  
User currently offlineTranspac787 From United States of America, joined Jul 2007, 3217 posts, RR: 13
Posted (6 years 9 months 1 week 4 days 9 hours ago) and read 2459 times:

Hey all,

It took a bit of "practice", but I'm now able to tell the differences between the GE, PW, and RR engines on 747, 757, 767, A330. The 777 though is a whole other story though. For the life of me, I cannot tell the differences between and identify the different types of engines on the 777. So, if anyone has any pointers, things to look for, etc....I'd much appreciate it.

Thanks in advance!!

6 replies: All unread, jump to last
 
User currently offlineIkramerica From United States of America, joined May 2005, 21580 posts, RR: 59
Reply 1, posted (6 years 9 months 1 week 4 days 9 hours ago) and read 2450 times:

The GE90 has the largest fan (with the GE90-115 having the largest fan in the GE90 family).

The RR has RR plaques on it.

So, if an engine seems a little small, and doesn't have RR stuck on it, it's a PW...  Wink



Of all the things to worry about... the Wookie has no pants.
User currently online7673mech From United States of America, joined Mar 2004, 744 posts, RR: 0
Reply 2, posted (6 years 9 months 1 week 4 days 8 hours ago) and read 2426 times:
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Off all aircraft the are least distinguishable.

The GE's the cowlings (fan, T/R - the painted ones) are the shortest. Atleast appear to be. (See BA).
The Pratts - the cowlings are longer but oval. (See UAL).
The RR - the cowlings look longest and the pylon portion a bit rectangular. (See Thai).

It is not like the others where RR have core cowls (meta) and GE's generally have tail cone exposed.

(Also most are marked).


User currently offlineBAW716 From United States of America, joined Nov 2003, 2028 posts, RR: 27
Reply 3, posted (6 years 9 months 1 week 4 days 8 hours ago) and read 2347 times:

Also, on the GE90-115, the blades are curved, not straight. Only engine I know of that had a curved outer blade. On the PWs, the blades are really BIG.

OK, this is not a highly technical answer, but I don't think this was a highly technical question  Smile


baw716



David L. Lamb, fmr Area Mgr Alitalia SFO 1998-2002, fmr Regional Analyst SFO-UAL 1992-1998
User currently offlineConcordeBoy From , joined Dec 1969, posts, RR:
Reply 4, posted (6 years 9 months 1 week 4 days 7 hours ago) and read 2343 times:



Quoting BAW716 (Reply 3):
only engine I know of that had a curved outer blade.

both the GEn-X and Trent1000 have it as well


User currently offlineDfwRevolution From United States of America, joined Jan 2010, 1001 posts, RR: 51
Reply 5, posted (6 years 9 months 1 week 4 days 7 hours ago) and read 2323 times:

When trying to distinguish between the PW4000 and the Trent 800 series, the "cap" on the fan hub is rounder on the Pratt engine. The Rolls Royce engine is more pointy. I really wish I had more descriptive, technical terms to back this up, but I'll let these pictures explain:


View Large View Medium
Click here for bigger photo!

Photo © Mark Ralph
View Large View Medium
Click here for bigger photo!

Photo © Phil Broad



The UA aircraft is obviously Pratt-powered, while the AA aircraft is Trent-powered.


User currently offlineLHR777 From , joined Dec 1969, posts, RR:
Reply 6, posted (6 years 9 months 1 week 4 days 5 hours ago) and read 2239 times:



Quoting Ikramerica (Reply 1):
The RR has RR plaques on it.

Not a clear sign of a RR engine. Look at AA's 777's. No RR emblem on the side. They're unbadged. It's a customer option.

From head-on, the RR Trent looks a bit smaller than the GE90, and is higher up (from the ground) when the aircraft is on the ground. At my local airport, I can always spot a P&W powered 777 on take-off. They always have a characteristic black smoke trail, that you don't generally see on RR and GE engines.


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