Driver Airframe in post 8101 queries the effect of altitude and speed on amount of fuel required to fly a set distance.
From Boeing Data for B777-200ER.
Long Range Cruise. Engines RR Trent 892
All up Weight at start of distance, 200.0 Tonnes
Time in hours and minutes, fuel burn in 1,000s kg
Distance Flight levels
(nm) 100 200 300 400
Fuel Time Fuel Time Fuel Time Fuel Time
600 11.5 1.50 9.1 1.37 7.5 1.28 6.6 1.22
1200 23.3 3.18 18.8 3.12 15.6 2.52 13.9 2.38
2000 38.5 6.08 31.2 3.21 26.4 4.45 23.5 4.19
Last edited by ghw78; 25th Mar 2014 at 23:18.