dakotasport
Posts: 230
Joined: Sat Dec 16, 2000 5:20 am

757 & RB211s

Wed Apr 28, 2004 4:06 pm

I was searching through the 'most popular' photos and came across an EAL 757-225 photo ID#564015 and I noticed the RR engines were similar in appearance to those on the L1011, 743 and was wondering why Boeing or RR went to the 'pop can' style cowl like those found on some of AA's fleet of 757s. I hope someone understands what I mean!!!

P.s. I like the older style engines myself, but are there any disadvantages to this design???

Thanks everyone who responds!!!
 
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VirginFlyer
Posts: 4636
Joined: Sun Sep 10, 2000 12:27 pm

RE: 757 & RB211s

Wed Apr 28, 2004 5:08 pm

Dakotasport - I *believe* the cowling was changed with the later generations of the RB211. The 'pop can' style cowl you describe is used on the RB211s fitted to 747-400s.

Here is the photo you were trying to post, by the way

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Photo © Bob Garrard



(FYI, to post a photo like that, type [photoid:564015], replacing the [ and ] with < and >)

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Panman
Posts: 603
Joined: Mon Aug 09, 1999 8:25 pm

RE: 757 & RB211s

Wed Apr 28, 2004 5:27 pm

What you are referring to is the common or integrated exhaust nozzle.

In earlier RB211's the cold stream (from the bypass airflow) mixed externally with the hot exhaust from the turbine exhaust nozzle.

In later models the cold stream and hot stream are mixed internally so to speak within the common exhaust nozzle.

This has the benefit that instead of having two airflows at different temperatures and speeds being exhausted into the surrounding atmosphere you now have one. This is a form of noise suppression - you only have the temperature/speed of the surrounding airflow and that of the exhausted gases. Only one shear layer to generate noise as opposed to two.

pAnmaN
 
dakotasport
Posts: 230
Joined: Sat Dec 16, 2000 5:20 am

RE: 757 & RB211s

Wed Apr 28, 2004 6:26 pm

Thanks very much for the info about the engine and also how to post pics!!
Thanks again!!!
 
viscount
Posts: 107
Joined: Wed Dec 22, 1999 12:35 am

RE: 757 & RB211s

Wed Apr 28, 2004 6:53 pm

The difference in cowlings is between the RB211-535Cs that were fitted the early 757s, such as those delivered to Eastern and BA, and the subsequent and more powerful RB211-535E4s fitted to later models.
 
justplanesmart
Posts: 680
Joined: Thu Mar 15, 2001 3:25 pm

RE: 757 & RB211s

Wed Apr 28, 2004 8:01 pm

And to add futher confusion, Eastern later retrofit the 757's that had the 535C's with the 535E4 model.
"So many planes; so little time..."
 
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TS-IOR
Posts: 3533
Joined: Mon Oct 08, 2001 9:44 pm

RE: 757 & RB211s

Wed Apr 28, 2004 9:28 pm



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Photo © Frank C. Duarte Jr.




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Photo © Pedro Aragão




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Photo © Alastair T. Gardiner




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Photo © Frank C. Duarte Jr.




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Photo © Frank Schaefer

 
av757
Posts: 601
Joined: Wed Apr 14, 2004 5:49 am

RE: 757 & RB211s

Wed Apr 28, 2004 11:52 pm

The other difference is the thrust the RB-211 turbofans produce:

RB211-535C 37,400lbs/166.3KN 757-200
RB211-535E4 40,100lbs/178.3KN 757-200
RB211-535E4B 43,100lbs/191.7KN 757-200/300,TU204

The only 757 at AV, N951PG with the 37,000 lbf RB211-535C engines operating at high altitude, high temperature airports such as BOG and RNG give us payload restrictions of almost 7000lbs less which does not occur with the rest of the fleet with RB 211-535E.

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