Did Roll Royce intend to have an engine on the -400ER and 400ERF model of the 747. A look on Boeing's website shows a range payload chart for the 747 with an RB211-524H8-T...
Also a google search for that engine reveals a few references to the 400ER series.
So did RR plan to launch an engine for the -400ER and if so what were the characteristics and why did it not make it (assumingly lack of market).
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