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Roland Perry · June 6th 13, 08:11 AM posted to uk.transport.london

In message , at 16:45:58 on Wed, 5 Jun
2013, remarked:
Doesn't a 747 have four engines?

Fair enough. But then apparently I used the takeoff figure for the amount
of air a jet sucks up, not the cruise figure which is somewhat lower.

The figure you quoted is correct for an RB211, as used on typical 747's.
It's the engines on smaller planes that peak around the same.
--
Roland Perry