Posts: 3094
Joined: Tue May 18, 1999 6:40 am

Fuel Burn

Mon Mar 22, 1999 5:58 pm

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.

Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Fuel Burn

Mon Mar 22, 1999 6:05 pm

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.

Posts: 389
Joined: Sat Aug 27, 2005 8:23 am

RE: Fuel Burn

Mon Mar 22, 1999 11:06 pm

A 757-200 at 230,000 pounds and at FL 290 will burn 9,720 PPH at Mach 0.82.
I would think that a 757 cruising at Mach 0.72 would be even less.
Posts: 955
Joined: Tue May 18, 1999 2:59 am

RE: Fuel Burn

Tue Mar 23, 1999 4:59 am

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).

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