Airliners.net Civil Aviation: A350 Cruise Speed Boosted To Mach 0.83
http://www.airliners.net/discussions/general_aviation/read.main/2472759/
- If plane X is just as efficient at .83 as plane B is at .81, plane X has the edge in relative fuel economy, since it flies the same distance in less time and burns relatively less fuel.
- Being able to go faster gives more flexibility to get and keep your optimum cruising level. If you're a 777 doing .84 and there's another 777 on your tail, no problem. If you're an A340 doing .82 being overtaken by a 777 doing .84, you may be required to descend, climb or some other maneuver to allow the faster plane to pass. The other way around: a faster plane can easily slow down, a slower plane has a harder time speeding up (less efficient). Especially over the ocean on perscribed tracks, you may be stuck at a lower level for hours and hours costing lots of fuel.
- If plane X is just as efficient at .83 as plane B is at .81, plane X has the edge in relative fuel economy, since it flies the same distance in less time and burns relatively less fuel.
- Being able to go faster gives more flexibility to get and keep your optimum cruising level. If you're a 777 doing .84 and there's another 777 on your tail, no problem. If you're an A340 doing .82 being overtaken by a 777 doing .84, you may be required to descend, climb or some other maneuver to allow the faster plane to pass. The other way around: a faster plane can easily slow down, a slower plane has a harder time speeding up (less efficient). Especially over the ocean on perscribed tracks, you may be stuck at a lower level for hours and hours costing lots of fuel.
posted by Tom Bucceri at 9:11 AM
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