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Originally Posted by BillyC
Quote:
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Originally Posted by SVeeedy Gonzales
Are those figures for the plane an average or at peak efficiency? I know planes perform well at peak efficiency, but on cheaper, budget flights, there's a large porion where the plane is nowhere near this, so the efficiency is much reduced. Coupled with the larger mileages that a plane covers, it's a lot of fuel used, even if it is more efficient.
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I guess that's peak cruising efficiency. I know that a plane at 25,000' will burn twice as much fuel (roughly) than when it's cruising at 35,000'.
A nasty Air Traffic Control unit could put a small airline out of business, by not controlling them to the higher altitudes!  |
Indeed,
A 747-1x or a 747-2x with the older RB211-54e engines would generate a fuel flow of about 41,000 kg/hour on takeoff. The specific gravity of JET-A1 is ~ 0.79, which works out at about 1.1 gallons per second per engine at takeoff thrust, or more soberingly - burning more fuel per second than the total capacity of the SV.
09-09-05, 01:50 PM
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