dave76 Posted October 8, 2019 Posted October 8, 2019 how do you calculate lbs fuel/nm for the 16 considering altitude and cas and weight ( i guess these are still classified data??......) which figures do you use ? thanks for the info...i know only bingo fuel for the block 50 is 1200 lbs ......
Frederf Posted October 8, 2019 Posted October 8, 2019 It would be in the -1 supplement which does have SFC figures directly but only for optimum cruise. Otherwise look up (interpolate as needed) from cruise tables for fuel flow numbers. Then divide by speed either TAS if you want "air miles" or GS if you want normal distance which will account for wind. Without supplement, divide fuel flow (lb/h) by ground speed (nm/h). The airplane can also report TAS and GS when fully developed, otherwise use "TS" on the F2 infobar. If you're burning 3800 lbs/hr and going 490 knots GS that is 7.76 lb/nm which would be an efficient cruise. You can expect 7-10 lb/nm for most reasonable cruise conditions. A further note 1200 lbs is not "bingo" but the normal recovery fuel state. Bingo is the fuel needed for recovery from current position and have normal recovery fuel at home or alternate. Bingo value is constantly changing and the alert reminder is often set at the highest expected value (e.g. when farthest from home).
Recommended Posts