RB211-535-E4 vs G
Thread Starter
Joined: Oct 2004
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From: Mars
RB211-535-E4 vs G
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
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
Joined: Aug 2001
Posts: 865
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From: Greater Aldergrove
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...
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...
Joined: Feb 2005
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From: flyover country USA
fuel burn vs installation
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.
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.
Thread Starter
Joined: Oct 2004
Posts: 85
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From: Mars
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
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
Joined: Jan 2005
Posts: 319
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From: north
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
Gas Turbines pdf
Cheers,
MM
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
Gas Turbines pdf
Cheers,
MM
Joined: May 2003
Posts: 41
Likes: 0
From: eastmidlands
Different Engine!
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.
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.
