JetJock16

EMB-120 Brasília, when the conditions are right can obtain between 700-750 lbs per hour TOTAL with cruise speed well above those of the Saab and the Dash! It’s VERY EFFICIENT!

Back when I flew the Bro I used to get trapped behind AE (Saab) out of LAX and Horizon (Dash; not the Q400, that bird leaves all TP’s in the dust) out of PDX & SEA. We easily out climbed them and always tried to get a visual so we could maintain separate (below class A) and blow right by them. Its only two problems are that they don't make them anymore so parts are hard to come by and it’s a design from the late 70’s so it’s just old as far as systems are concerned. They’ve made some improvement but you can only do so much. None the less it was a blast to fly.

CFI4ever

Few comparisons based on an approximate average of these posts, plus some fuel numbers from my mentor:
Pounds of fuel burned per passenger per mile flown:
emb120 .068
saab .071
crj2 .146
crj7 .117
crj9 .101
e170 .120
b737 .075
Don't have numbers for the Q400, but, the RJ's look like fuel pigs.

FliFast

Good info CFI.

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).

CFI4ever

Thanks Flifast,

Your ac in a passenger configuration of 323 (2 seating classes) or high density 410 single class would be .082 and .064 pounds of fuel per passenger mile, respectively.

The cessna 152 is about .160...

Laxrox43

It depends on the person for the Saab. I have seen the Saab sip gas like that, but you are flying with less than charted torque settings...like 40% at cruise at 15,000ft or so.

It's called "block or better!"

TonyWilliams

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)

IBFlyin

http://cf.alpa.org/internet/alp/1999/mayQ400.htm


Found this in a search, the article has fuel burns through all stages of flight.

CFI4ever

Thanks TonyW and IBflying for the info,

Tony you're correct, I was assuming cruise. My crj2 #'s are from a b737 (now) pilot that flew the 200 for approx 5k hrs. 3,000 pounds total cruise at .74 Mach is a good number and your .12 calc for statue miles matches the .146 for pounds per passenger per nm.

I also assumed the 12,000 pph for the MD-11 at .81 Mach, numbers per nm.

The Q400 70 pax would be .088 and for 78 pax is .079 in nm terms, not bad.

Again, the C-152 is an abysmal .16 pounds per passenger per nm....

freezingflyboy

1200-1300lbs per side at FL370 and .77-.78 in the ERJ-145XR. Thats a pretty normal fuel burn.

I've flown with the XR pulled back for long-range cruise and it'll do .63-.65 at 900-1000lbs per side pretty comfortably.

BlueMoon

These are some numbers from the past 2 days I wrote down out of boredom for the CR7.


68k FL380 .80m 3400lbs/hr
75k FL360 .82m 3800lbs/hr (we were running late)
70k FL370 .78 3300lbs/hr

Weights are T/O weights, burns are both engines