On Feb 3, 9:42 am, Mxsmanic wrote:
Less fuel = less power.

MX, I am laughing now.I cant figure out if you are really that
ignorant or if you are just messing with me.The real reson jets fly
high is for speed.The higher they go, the faster they can go.Why do
you think jets measure cruise speed in Mach?What do you think happens
to Mach as a jet flys higher?Now explain how you can move a jet (Or
anything else for that mater, like a car) FASTER on LESS thrust?For
the 3rd time here MX, you have made a misconception and you are
thinking backwards.


Jets have a service ceiling for several reasons. For one, eventually
the air is too thin to provide any lift, no matter how fast you are
moving. For another, eventually the air is too thin to support
internal combustion engines.

MX, I am laughing even harder now!Can you explain the real reason
behind a jets service ceiling and what it is a function of?

Explain to us what a "sweet spot" is.

Greatest distance covered per unit of fuel consumed, lowest wear and
tear on the aircraft (especially engines).

??? I gotta ask you MX, what airline do you work for?Are you saying
they use LCR or CCR charts to determine power settings?I hate to argue
with you but when I was in initial training at my fist jet job, it was
explained (very compellingly) why we dont base cruise flight on
this.If you are doing something different, Id like to know the
reasoning behind it.

Why is it that you feel the airlines dont take into account TIME
when doing the preflight planing.

They do, but fuel costs more than time. That's why flights are longer
now than they used to be: airlines plan for fuel economy, not speed.

OK, Ill bite MX.Why are you claiming that speed is not a function of
economy.Has it not occured to you that the LONGER a plane is in the
air, the more wear and tear it is incuring?Also, the longer a plane is
in the air, the more fuel it is burning.Which of course means the more
fuel it has to carry.Which means it is heavier.Which requires more
thrust.Tell me how this saves fuel again?

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