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757 & RB211s  
User currently offlineDakotasport From Canada, joined Dec 2000, 228 posts, RR: 0
Posted (9 years 11 months 4 weeks 1 day 6 hours ago) and read 1887 times:

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!!!

7 replies: All unread, jump to last
 
User currently offlineVirginFlyer From New Zealand, joined Sep 2000, 4537 posts, RR: 42
Reply 1, posted (9 years 11 months 4 weeks 1 day 5 hours ago) and read 1799 times:

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 >)

V/F



"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
User currently offlinePanman From Trinidad and Tobago, joined Aug 1999, 790 posts, RR: 0
Reply 2, posted (9 years 11 months 4 weeks 1 day 4 hours ago) and read 1759 times:

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


User currently offlineDakotasport From Canada, joined Dec 2000, 228 posts, RR: 0
Reply 3, posted (9 years 11 months 4 weeks 1 day 3 hours ago) and read 1685 times:

Thanks very much for the info about the engine and also how to post pics!!
Thanks again!!!


User currently offlineViscount From Gibraltar, joined Dec 1999, 112 posts, RR: 0
Reply 4, posted (9 years 11 months 4 weeks 1 day 3 hours ago) and read 1637 times:

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.

User currently offlineJustplanesmart From United States of America, joined Mar 2001, 713 posts, RR: 2
Reply 5, posted (9 years 11 months 4 weeks 1 day 2 hours ago) and read 1580 times:

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..."
User currently offlineTs-ior From Tunisia, joined Oct 2001, 3410 posts, RR: 6
Reply 6, posted (9 years 11 months 4 weeks 1 day ago) and read 1517 times:



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Photo © Frank C. Duarte Jr.




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Photo © Pedro Aragão




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Photo © Alastair T. Gardiner




View Large View Medium
Click here for bigger photo!

Photo © Frank C. Duarte Jr.




View Large View Medium
Click here for bigger photo!

Photo © Frank Schaefer



User currently offlineAV757 From Colombia, joined Apr 2004, 658 posts, RR: 6
Reply 7, posted (9 years 11 months 4 weeks 22 hours ago) and read 1423 times:
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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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