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Visually Identifying The Difference Between Engine  
User currently offlineQantas747300 From Australia, joined Dec 2006, 63 posts, RR: 0
Posted (2 years 8 months 1 week 5 days 8 hours ago) and read 4614 times:

I am trying to identify the visible differences between the multiple engine manufacturers and models available to Boeing and Airbus aircraft. For example, what are the differences that would allow one to visually differentiate between RR, GE and P&W family of engines?

I can't seem to get similar posts to display all of the fantastic information posted.

Your input is greatly appreciated.

12 replies: All unread, jump to last
 
User currently offlineCaptainKramer From United Kingdom, joined Feb 2012, 226 posts, RR: 0
Reply 1, posted (2 years 8 months 1 week 5 days 6 hours ago) and read 4579 times:

Rolls Royce RB211 is the most easily identifiable on the 747-400 with the nacelle running the whole length of the engine, from intake to turbine exhaust, mixing the core and bypass together before exiting. The Rolls Royce Trent 700 on the A330's have a distinct look from head on, with the flat appearance given to the base on account of the gear boxes position on the side, although the intake is still circular. The IAE 2000 on A319,A320,A321 narrow bodies has a similar look to the Rolls RB211 because of Rolls Royce involvement on that engine.

I always found it difficult to spot the difference between the P&W versus the GE from a distance on a 747-400, on account of their similarities with the nacelle structure. The one thing that you can use to differentiate the P&W from the GE on the 747-400 is the nacelle fairing on the P&W around the bypass section is slightly more contoured and shorter when viewed from the side, while the GE seems flatter and longer around the nacelle bypass section. The 747-100/200 had the P&W JTD-9 to begin with, (which eventually found it's way onto the 747-300) followed by GE's engine, then Rolls with the RB211, which did not have the nacelle shroud covering the exhaust area, a legacy of it's origins on the Tristar I imagine. The look of the P&W engine has evolved over time, with the most distinct difference on the PW4000 used on the 747-400, being no witches hat shaped exhaust cone.

On the narrow bodies the CFM is very distinct reflecting it's GE heritage I suppose, but when viewed from the front, on a B737-300/400/500 or a B737-600/700/800/900 it has that oval squat intake which provides the necessary ground clearance. Also the CFM on the Next Gen 737's have the thin pipe sticking out of the exhaust, while the 737-3/4/500 don't. Does anybody know what the thin pipe is designed to do, or is merely for easy identification as a 737 Next Gen engine.

As far as the spinners are concerned Rolls favours, a very distinct witches hat design on the RB211 all the way up to the Trents except on the Trent 800 which features a collar before the spinner and flies on the B777, while P&W went with the dome shaped spinner on the JTD-9, PW 2000/4000 as did GE on it's engines. Then came the GE90 on the B777 and GE adopted a modified spinner, less dome shaped more pointed to help disperse any foreign objects away from the core intake.

Also another question for those in the know, is the nacelle shaped in such a way that it provides some lift?

Failing all that you can read the logo's on the side of the nacelle to see which manufacturer it is, except AA, who for some reason are ashamed to wear the RR logo on their Trent powered 777's.

Hope this is of some help Qantas 747300. Is this for research?

[Edited 2012-03-19 20:17:11]

User currently offlineQantas747300 From Australia, joined Dec 2006, 63 posts, RR: 0
Reply 2, posted (2 years 8 months 1 week 4 days 10 hours ago) and read 4386 times:

A sincerest thank you to CaptainKramer. Your knowledge has been of great help and I certainly look forward to your questions being answered.

Whilst this is for research, I hope to expand my knowledge about this field.


User currently offlinejetlife2 From United States of America, joined Jul 2006, 221 posts, RR: 25
Reply 3, posted (2 years 8 months 1 week 4 days 6 hours ago) and read 4346 times:

Quoting CaptainKramer (Reply 1):
Does anybody know what the thin pipe is designed to do

That is the center vent tube which vents air from the sump.

For 777-200ER family engines where there are GE, PW and RR available: the GE90 is distinguishable by its composite fan blades. These blades are black in color with a titanium leading edge. On the 777-300ER/777-200LR/777F family there are only GE90's available, but these are GE90-100 series vs the GE90 base model on the earlier airplane.

The two models of GE90 are easily distinguished (if you didn't already identify the different aircraft): The composite fan blades on the base engine have an essentially straight leading edge; the fan blades on the GE90-100 series have a marked 3D curved leading edge.


User currently offlineCaptainKramer From United Kingdom, joined Feb 2012, 226 posts, RR: 0
Reply 4, posted (2 years 8 months 1 week 3 days 17 hours ago) and read 4262 times:

No problem Qantas747300.

Thanks jetlife2,

The placement of the oil sump vent in the exhaust efflux makes sense. On RB211's the vent is placed either on the side or at the bottom of the nacelle, creating drag, minimal, but it all adds up, also I was so focused on the nacelle, that I compleletly forgot about the fan blades. I read on flightglobal that RR have been working on developing composite blades, with possible application on Boeing's proposed B777-800/900X, if GE doesn't get exclusivity, so I imagine regulations will require a titanium leading edge on the RR blades ala GE90.


User currently offlineyeelep From United States of America, joined Apr 2011, 669 posts, RR: 0
Reply 5, posted (2 years 8 months 1 week 3 days 17 hours ago) and read 4251 times:

The 737 clssic CFM56-3 also has the same vent, just not as pronounced.

NG CFM56-7B

737NG Latest and greatest CFM56-7BE has a visibly shorter nozzle


User currently offlinePhen From Ireland, joined Oct 2007, 318 posts, RR: 0
Reply 6, posted (2 years 8 months 1 week 3 days 12 hours ago) and read 4183 times:

Quoting jetlife2 (Reply 3):
For 777-200ER family engines where there are GE, PW and RR

I find looking at the engine pylons on Boeing 777s is an easy way to distinguish engine type.

The RR pylon is the biggest and has a rather blocky rectangular appearance.

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Photo © Gordon Gebert Jr



The GE pylon is much thinner with quite an obvious upward angle but has a very gentle S shape curve and a slight bulge at the front.

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Photo © Darren Koch



The PW pylon is very distinctive from a distance. It is much shorter than the other two and has a slow even downward curve toward the front.

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Photo © Josh May



Hope that helps!  


User currently offlineSpeedbird128 From Pitcairn Islands, joined Oct 2003, 1648 posts, RR: 2
Reply 7, posted (2 years 8 months 6 days 14 hours ago) and read 3868 times:

Quoting CaptainKramer (Reply 1):
The IAE 2000

Minor correction there - IAE V2500



A306, A313, A319, A320, A321, A332, A343, A345, A346 A388, AC90, B06, B722, B732, B733, B735, B738, B744, B762, B772, B7
User currently offlineDocLightning From United States of America, joined Nov 2005, 20242 posts, RR: 59
Reply 8, posted (2 years 8 months 6 days 14 hours ago) and read 3855 times:

Quoting Phen (Reply 6):
The PW pylon is very distinctive from a distance. It is much shorter than the other two and has a slow even downward curve toward the front.

PW4000 also has a visibly smaller fan diameter than RR or GE.


User currently offlinePolot From United States of America, joined Jul 2011, 2314 posts, RR: 1
Reply 9, posted (2 years 8 months 6 days 12 hours ago) and read 3822 times:

Quoting DocLightning (Reply 8):
PW4000 also has a visibly smaller fan diameter than RR or GE.

It is the RR that has the smallest fan diameter on the 777.And it is indeed really noticeable compared to the GE-90s:


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Photo © Kay Hansen
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Photo © Gregg Stansbery



User currently offlineQantas747300 From Australia, joined Dec 2006, 63 posts, RR: 0
Reply 10, posted (2 years 7 months 4 weeks 6 hours ago) and read 3407 times:

Thank you all for your fantastic efforts. Very enlightening.

User currently offlineDocLightning From United States of America, joined Nov 2005, 20242 posts, RR: 59
Reply 11, posted (2 years 7 months 4 weeks 4 hours ago) and read 3389 times:

Quoting Polot (Reply 9):

It is the RR that has the smallest fan diameter on the 777.And it is indeed really noticeable compared to the GE-90s:

I stand corrected!

GE90-94=123" (GE90-115B=128")
PW4000=112"
RR T800=100"


User currently offlinenipoel123 From Netherlands, joined Jan 2011, 271 posts, RR: 0
Reply 12, posted (2 years 7 months 4 weeks 3 hours ago) and read 3377 times:

On the A330, the GE engine looks very different from the RR one:

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Photo © Todd Martin
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Photo © Noam Menashe




one mile of road leads to nowhere, one mile of runway leads to anywhere
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