Jetpilot From United States of America, joined May 1999, 3130 posts, RR: 29 Posted (15 years 4 weeks 14 hours ago) and read 836 times:
The DC8 50 series w/ our new stage three hush kit burns about 15,500 PPH at 280,000 Pounds at 29000 ft and mach .72 in cruise. Does anyone know the fuel burn for a 757 which is of similar size. I would be very interested to know.
Jetpilot From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 1, posted (15 years 4 weeks 14 hours ago) and read 836 times:
By the way I'm guessing with the 757 at 35000 ft at mach.77 It would burn about half of that. From MIA to Guatemala we burn about 45000 pounds. I bet a 757 would burn about 23000. Is there a pilot here who might fly that route with other equiptment.
BryanG From United States of America, joined May 1999, 429 posts, RR: 0
Reply 3, posted (15 years 4 weeks 3 hours ago) and read 837 times:
A 757 at M.82 at that weight would really be sucking gas. Normal cruising speed is M.80 at altitude. A general fugure for that plane is between 7,500 pph and 8,000 pph depending on weight.
I've got a few pages from the 767-200 manual, which gives the fuel burn in NAM for a given TAS at altitude. Calculated out, book burn rates at 29,000 at Mach .80 are 10,500pph at 220,000 lb (very light) and 11,800pph at 310,000 lb (heavy).