Qantas747300
Topic Author
Posts: 65
Joined: Fri Dec 29, 2006 7:08 pm

Visually Identifying The Difference Between Engine

Tue Mar 20, 2012 1:26 am

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.
 
CaptainKramer
Posts: 256
Joined: Thu Feb 09, 2012 8:12 pm

RE: Visually Identifying The Difference Between Engine

Tue Mar 20, 2012 3:12 am

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]
 
Qantas747300
Topic Author
Posts: 65
Joined: Fri Dec 29, 2006 7:08 pm

RE: Visually Identifying The Difference Between Engine

Tue Mar 20, 2012 11:41 pm

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.
 
jetlife2
Posts: 179
Joined: Sun Jul 09, 2006 11:32 am

RE: Visually Identifying The Difference Between Engine

Wed Mar 21, 2012 2:56 am

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.
My views are not necessarily the views of the GE Company
 
CaptainKramer
Posts: 256
Joined: Thu Feb 09, 2012 8:12 pm

RE: Visually Identifying The Difference Between Engine

Wed Mar 21, 2012 4:04 pm

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.
 
yeelep
Posts: 724
Joined: Mon Apr 04, 2011 7:53 pm

RE: Visually Identifying The Difference Between Engine

Wed Mar 21, 2012 4:26 pm

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
 
Phen
Posts: 228
Joined: Mon Oct 29, 2007 7:05 pm

RE: Visually Identifying The Difference Between Engine

Wed Mar 21, 2012 8:57 pm

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.

View Large View Medium
Click here for bigger photo!

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.

View Large View Medium
Click here for bigger photo!

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.

View Large View Medium
Click here for bigger photo!

Photo © Josh May



Hope that helps!  
 
speedbird128
Posts: 1562
Joined: Tue Oct 28, 2003 2:30 am

RE: Visually Identifying The Difference Between Engine

Sun Mar 25, 2012 7:14 pm

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 avatar
DocLightning
Posts: 19576
Joined: Wed Nov 16, 2005 8:51 am

RE: Visually Identifying The Difference Between Engine

Sun Mar 25, 2012 7:34 pm

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.
-Doc Lightning-

"The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars."
-Carl Sagan
 
User avatar
Polot
Posts: 4570
Joined: Thu Jul 28, 2011 3:01 pm

RE: Visually Identifying The Difference Between Engine

Sun Mar 25, 2012 9:28 pm

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:


View Large View Medium
Click here for bigger photo!

Photo © Kay Hansen
View Large View Medium
Click here for bigger photo!

Photo © Gregg Stansbery

 
Qantas747300
Topic Author
Posts: 65
Joined: Fri Dec 29, 2006 7:08 pm

RE: Visually Identifying The Difference Between Engine

Tue Apr 03, 2012 3:05 am

Thank you all for your fantastic efforts. Very enlightening.
 
User avatar
DocLightning
Posts: 19576
Joined: Wed Nov 16, 2005 8:51 am

RE: Visually Identifying The Difference Between Engine

Tue Apr 03, 2012 5:08 am

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"
-Doc Lightning-

"The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars."
-Carl Sagan
 
nipoel123
Posts: 236
Joined: Thu Jan 13, 2011 6:23 am

RE: Visually Identifying The Difference Between Engine

Tue Apr 03, 2012 6:34 am

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

View Large View Medium
Click here for bigger photo!

Photo © Todd Martin
View Large View Medium
Click here for bigger photo!

Photo © Noam Menashe

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

Who is online

Users browsing this forum: No registered users and 14 guests