RB211-535-E4 vs G

[screw fix diret]

My 757 has RB211-535-E4 engines. I gather that 747's of a certain Asian outfit have a G version.
My 757 uses about 3.6T per hour ie 1.8T per engine. I am led to believe that the G uses about 3T per hour.
This leads me to conclude that there is more than just a subtle difference between the 2 engines. Can any body enlighten me to the intracacies of these two engines please?
(Not checked for spelling due to red wine intake!)
SFD

[NWSRG]

Does the 747 not have RB211-524 engines in G and H versions?

A significantly different engine...though I would have thought that a 757 pilot would have known that...

Maybe you meant to say 767, but your common type rating, or the red wine, got you confused...:confused:

[barit1]

I strongly suspect the 747 in cruise uses a smaller fraction of available thrust than does the 757. I have observed this on other 2 vs 3 vs 4 engine ships using the same engine model.

Cruise altitude makes a big difference too.

You have to normalize for all these variables before you can really decipher just how thirsty the donk is.

[screw fix diret]

My 767 has GE engines and uses about 5T/hr (2.5T each).
In my simplistic red wine induced state, I thought that the old jet jobbie was more efficient when working hard, so the the designer bloke would have specified a donkey of the right size to do the job in hand as opposed to throttling back an over sized unit. (Unless of course he designed small Airbuses which could do with a lot bigger engine all round, seeing as they always seem to be geeting in the way these days-term of endearment and I am now going to bed ready to apolagize in the 'morrow!)

SFD

[TopBunk]

SFD

I think you'll find the -535 produces about 38K of thrust whereas the -524G produces about 58K.

They're both RB211 engines in concept but that's where it stops!

[XPMorten]

The -524 and -535 are very different.
e.g. the -524 has an extra fan on the N2 stage, has a larger diameter and is heavier.

Cheers,
MM

http://www.xplanefreeware.net/~morten/jpgs2/RB211.jpg

[screw fix diret]

Thank you all for helping me with that one. MM can you send me the link for that RR rundown please.

Regards

SFD

[XPMorten]

SFD,

That's from a pdf file covering most Gas Turbine engines in general. Very useful.
Don't remember exactly where I found it, but I have uploaded it for you :D

Gas Turbines pdf (http://www.xplanefreeware.net/~morten/jpgs2/GasTurbines.pdf)

Cheers,

MM

[spannerless]

Different Engine!

As some one has already pointed out the two A/C use different engines, different ratings and the later the 524 G/H/T uses a Full Authority Fuel Controller FAFC for short!

Think this may have a little difference in performance and fuel economy.:ok: