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RB211-535C & RB211-535E4 Intermix

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Posted (5 months 3 weeks 4 days 6 hours ago) and read 2766 times:

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

Think of the brighter side!

14 replies: All unread, jump to last

IFixPlanes From Germany, joined Feb 2005, 238 posts, RR: 0
Reply 1, posted (5 months 3 weeks 3 days 18 hours ago) and read 2628 times:

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

Compare the length, thrust, etc. in the TCDS (E12EU) and you see why!

never tell an engineer he is wrong ;-)

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 2, posted (5 months 3 weeks 3 days 15 hours ago) and read 2601 times:

What I meant was why not a conversion attachment to accomodate both versions.

Think of the brighter side!

Tristarsteve From Sweden, joined Nov 2005, 3694 posts, RR: 34
Reply 3, posted (5 months 3 weeks 3 days 14 hours ago) and read 2596 times:

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.)

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 4, posted (5 months 3 weeks 3 days 13 hours ago) and read 2578 times:

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.

Think of the brighter side!

IFixPlanes From Germany, joined Feb 2005, 238 posts, RR: 0
Reply 5, posted (5 months 3 weeks 2 days 18 hours ago) and read 2459 times:

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)

never tell an engineer he is wrong ;-)

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 6, posted (5 months 3 weeks 2 days 14 hours ago) and read 2430 times:

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.

Think of the brighter side!

boeing767mech From United States of America, joined Dec 2000, 992 posts, RR: 3
Reply 7, posted (5 months 3 weeks 2 days 13 hours ago) and read 2421 times:

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???

Never under-estimate the predictably of stupidty

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 8, posted (5 months 3 weeks 1 day 15 hours ago) and read 2285 times:

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.

Think of the brighter side!

boeing767mech From United States of America, joined Dec 2000, 992 posts, RR: 3
Reply 9, posted (5 months 3 weeks 1 day 15 hours ago) and read 2282 times:

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]

Never under-estimate the predictably of stupidty

strfyr51 From United States of America, joined Apr 2012, 488 posts, RR: 0
Reply 10, posted (5 months 3 weeks 1 day 8 hours ago) and read 2233 times:

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.

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 11, posted (5 months 3 weeks 13 hours ago) and read 2142 times:

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.

Think of the brighter side!

Western727 From United States of America, joined Jan 2007, 579 posts, RR: 4
Reply 12, posted (5 months 2 weeks 2 days 7 hours ago) and read 1833 times:

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?

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 13, posted (5 months 2 weeks 1 day 16 hours ago) and read 1685 times:

Better Materials, Revised bleed valve distribution,Extended Tail pipe etc to name a few.

Think of the brighter side!

SmittyOne From United States of America, joined Feb 2012, 902 posts, RR: 2
Reply 14, posted (5 months 2 weeks 1 day 12 hours ago) and read 1651 times:

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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