Originally Posted by
FliFast
The MD11 burns 18000 pph at high speed cruise (M.84-.85) in the low 30's. It burns 15000 pph at most econ settings (m.82-.83). If you really lean the mixture on it and/or fly it at high altitude -upper 30's low 40's you can get it down to 12000 pph (M.815-.82).
Ok, so for an airliner config;
MD-11CF - Operating empty passenger configuration 131525kg (289965lb), ... MD-11 - Max single class seating for 410, can seat 298 in three classes, ...
So, I'm gunna say you're doing 550mph (480kts TAS) at your econ fuel setting of 15k equals 27.3 pounds per mile, equals .091 pounds per pax mile in typical three class seating, and .066 with 410 seats.
Of course, those numbers are skewed to the low side by not including climb-out fuel burn during the flight, that I suspect the comparison numbers above do.
For example, the worst of the worst flying today is the CRJ-200, and while it can fly at 2400 pph, a typical mission average is more like 3000 for a 1 to 2 hour flight.
So, that comes out to 3000 divided by 500mph, equals 6 pounds per mile, divided by the singular seating configuration of 50, equals .12. In cruise, at 2400pph, .096
The difference is 25% on the CRJ-200 between "mission profile" pound/seat/mile cost and that same cost in cruise only.
Since the MD-11 is going to do much longer legs, perhaps that difference is only 10% ? That's what I'll factor, however a short 1 to 2 hour leg might indeed hit the 25% premium.
So, my "numbers" are for a mission in typical seating arrangements are:
CRJ-200 - 0.12
MD-11 - 0.11 to 0.10 (short to long haul)