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HAWK21M
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RB211-535C & RB211-535E4 Intermix

Sat Dec 01, 2012 6:43 pm

Why was the RB211-535C & RB211-535E4 Intermix option not provided by Boeing.Any reason.
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IFixPlanes
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RE: RB211-535C & RB211-535E4 Intermix

Sun Dec 02, 2012 7:00 am

Quoting HAWK21M (Thread starter):
...Any reason.

Compare the length, thrust, etc. in the TCDS (E12EU) and you see why!  
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Sun Dec 02, 2012 10:00 am

What I meant was why not a conversion attachment to accomodate both versions.
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Tristarsteve
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RE: RB211-535C & RB211-535E4 Intermix

Sun Dec 02, 2012 10:13 am

Eastern had B757 delivered with 535C engines, which they replaced with 535E.
British Airways bought the removed engines and fitted them to new B757 on the line.
The 535C was much cheaper than the E, and BA average B757 route was 90mins. In those days of cheap fuel it made sense to use the C engines.
And the C engines use a lot more fuel. We had both, and for a 2 hour sector the C would use about a ton more fuel.
We tanked 12 tonnes on a E and 13 tonnes on a C engined B757. (Fuel in tanks, not burn.)
 
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Sun Dec 02, 2012 11:56 am

Quoting Tristarsteve (Reply 3):
And the C engines use a lot more fuel.

Read someplace that the difference in fuel consumption of the -C to the -E4 is approx 18% more.
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IFixPlanes
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RE: RB211-535C & RB211-535E4 Intermix

Mon Dec 03, 2012 7:05 am

So, what do you want to know?  
- Intermix (different engine types on the same aircraft) or
- conversion (changing from two 353C to two 353E4 and vice versa)
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Mon Dec 03, 2012 10:22 am

Intermixing between the RB211-535E4,RB211-535E4-B2 & RB211-535E4-C exist.
I'm referring to dual usage of the RB211-535C & its -E4 counterpart.
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boeing767mech
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RE: RB211-535C & RB211-535E4 Intermix

Mon Dec 03, 2012 11:49 am

Quoting HAWK21M (Reply 6):
Intermixing between the RB211-535E4,RB211-535E4-B2 & RB211-535E4-C exist.

E4's and C motors have differnet C Ducts ( thrust reversers) so it is more then just bolt on a engine and go.

You have pictures of a 757 with a E4 on one side and a C motor on another???
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Tue Dec 04, 2012 9:42 am

Quoting boeing767mech (Reply 7):

You have pictures of a 757 with a E4 on one side and a C motor on another???

I do....We have both types........
However was wondering why Boeing did not consider a fixing device common for both types.
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boeing767mech
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RE: RB211-535C & RB211-535E4 Intermix

Tue Dec 04, 2012 9:48 am

Quoting HAWK21M (Reply 8):
Quoting boeing767mech (Reply 7):
You have pictures of a 757 with a E4 on one side and a C motor on another???
I do....We have both types........

Lets try this again, do you have a picture with ONE Airframe with a 535C under one wing and a 535E under the other?

Why would you put a lesser thrust engine on one side of the airplane, not to forget the 24 hours of downtime to the airframe changing the C ducts since they are not interchangable between 535C and 535E's????

[Edited 2012-12-04 01:52:40]
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strfyr51
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RE: RB211-535C & RB211-535E4 Intermix

Tue Dec 04, 2012 4:21 pm

AS I recall? The engine choice is made by the Operator and were enough RB211 operators to press Boeing and the pylon supplier (who might NOT be Boeing) for an answer then it might happen, but the problem is mainly to Rolls Royce Not Boeing. Rolls might NOT see any reason to look for a solution. And? Their solution might be,, Get rid of the 'C' model and upgrade to the "E4" model.
 
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Wed Dec 05, 2012 11:56 am

Quoting boeing767mech (Reply 9):

Why would you put a lesser thrust engine on one side of the airplane, not to forget the 24 hours of downtime to the airframe changing the C ducts since they are not interchangable between 535C and 535E's????
Quoting strfyr51 (Reply 10):
Rolls might NOT see any reason to look for a solution. And? Their solution might be,, Get rid of the 'C' model and upgrade to the "E4" model.

Looking for a situation where by an operator could use both types in case there was a spare issue for a small duration.
If RR decided against it there must have been a reason.
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Western727
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RE: RB211-535C & RB211-535E4 Intermix

Mon Dec 10, 2012 6:11 pm

Quoting HAWK21M (Reply 4):
difference in fuel consumption of the -C to the -E4 is approx 18% more.

That's huge for a sister engine with comparable thrust. Anyone know what in particular contributed to the reduced fuel consumption on the -E4?
Jack @ AUS
 
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HAWK21M
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RE: RB211-535C & RB211-535E4 Intermix

Tue Dec 11, 2012 8:30 am

Better Materials, Revised bleed valve distribution,Extended Tail pipe etc to name a few.
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smittyone
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RE: RB211-535C & RB211-535E4 Intermix

Tue Dec 11, 2012 1:06 pm

Quoting Western727 (Reply 12):
That's huge for a sister engine with comparable thrust. Anyone know what in particular contributed to the reduced fuel consumption on the -E4?

The E4 also has the wider chord fan blades...not sure how much that matters?

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