.76 vs .78
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.76 vs .78
Great debate here in the US, well at my company anyway, whether or not to fly the MD80 at .76 or .78. Seems the aircraft does better at .78. I can't sell many on it though. I still seem to make gas at .78. We do however, fly the aircraft on rather long sectors. MD87 on 4 to five hour runs and the 83 as well so .78 over this period does work better but was curious at what others do with the aircraft. Thanks.
Join Date: Oct 2001
Location: Europe
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Don't know if I'll be helping you here, 'cause we like to fly it at .77...
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If in a bit of a hurry, .78 works nicely on the longer A/C, while the -87 feels better at .77. Somehow the shorter body gives more drag/vibrations than it's stretched sisters.
.76/FMS econ. speed is used when well ahead of schedule and tailheavy/trimmed mid-way.
Higher speeds works better if the ship is nose-heavy, since FMS speed will give a nose-high attitude with high fuel flow in this instance (the FMS doesn't take CG into account).
In other words, now that the business class pax have all but left, we generally fly slower..
.If in a bit of a hurry, .78 works nicely on the longer A/C, while the -87 feels better at .77. Somehow the shorter body gives more drag/vibrations than it's stretched sisters.
.76/FMS econ. speed is used when well ahead of schedule and tailheavy/trimmed mid-way.
Higher speeds works better if the ship is nose-heavy, since FMS speed will give a nose-high attitude with high fuel flow in this instance (the FMS doesn't take CG into account).
In other words, now that the business class pax have all but left, we generally fly slower..
