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Old February 4th 07, 11:06 PM posted to rec.aviation.piloting
Mxsmanic
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Default Increasing power required with altitude.. what's a good plain english explanation?

xerj writes:

All of the definitions of power that I have seen have been along the lines
of P = T * V, or something that equates to that.


Yes. I may have misread your previous post as "distance/time" meaning
"distance or time" (not distance over time).

Force * distance = work
Work / time = power
Thrust = force

A constant IAS requires constant power to maintain at any altitude. A
constant TAS requires constant power to maintain at only one altitude;
if the altitude increases, the power required diminishes, and vice
versa. The power produced by most powerplants diminishes with
altitude; the thrust they can maintain at a given IAS varies directly
with the power.

I think I have that right. It's easy to get confused.

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