RB211 747
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Join Date: May 2009
Location: England
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RB211 747
Hi Guys,
Just out of interest, is anyone able to tell me about the technology differences between RR RB211 on 747-200 & 747-400 (524 - 524-g).
cheers,
Just out of interest, is anyone able to tell me about the technology differences between RR RB211 on 747-200 & 747-400 (524 - 524-g).
cheers,
Join Date: Jan 2013
Location: Seattle Area
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The most obvious differences between the -524G and earlier -524 variants were wide chord fan blades and a full authority digital engine control. Higher thrust and higher bypass ratio as well.
Common nozzle exhaust on the 524G/H too.
a full authority digital engine control.
The RB211-524G/H had a major upgrade in the early 1990s - the "-T" (i.e. an engine so modified became a RB211-524G-T or H-T. Vague memory says the -T was an upgraded HP turbine, good for ~1% fuel burn.
The wide-cord fan blades on the RB211-524G/H were a significant efficiency improvement, but the hollow titanium construction was susceptible to fan flutter issues when operated statically over a specific fan rpm range. We needed to update the FAFC software to implement a 'keep out' zone when the airspeed was less than 35 knots.