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Maximizing weight saveing versus cost

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Stuart R BPL Member
PostedMay 28, 2010 at 2:32 pm

The lapse rate for dry (unsaturated) air is 9.8C per 1000m

The lapse rate for saturated air is around 5C per 1000m

The 6.5C per 1000m is the 'standard' average.

Ignoring the days when you get a temperature inversion…

PostedMay 28, 2010 at 3:24 pm

Cool, i'm learning…

So is the average lapse rate not that of dry air because at some elevation you are going to get some condensation?

I'm thinking if I look up and see my destination and there are no clouds, the dry rate is applicable. However, if there are clouds between here and there, then the average (or even wet) lapse rate is applicable and condensation is adding heat.

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