PPRuNe Forums - Mach number as weight changes

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XTurb

4th December 2007 11:08

Mach number as weight changes

Why does Mach number seem to decrease as weight reduces during a flight (i.e. fuel burn)?
Should it? Or is it just my imagination?

EDML	4th December 2007 11:13

Because the speed for optimum range or a given cost factor will decrease
with decreasing weight.

XTurb

4th December 2007 11:19

Cheers for that. Yeah, that makes sense. I need to go back over my ATPL notes...

PWA!

(PPRuNe wins again).

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