PPRuNe Forums - View Single Post - Why heavier aircrafts take longer to slow down in the air?
Old 22nd Nov 2012, 20:37
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HazelNuts39
 
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Originally Posted by Bye
F/M is that some code
SMOC states Newton's second law as: F=MA. It relates force F, mass M and acceleration A. Energy doesn't come into it.

Extricate's questions in posts #1 and #5 are about A, which equals F/M. F is aerodynamic drag, and it is related to mass M by the aerodynamic lift which equals weight. So a question about A=F/M is about aerodynamics.

I look forwards to your explanations and analogies of why a heavier aircraft below Vmd slows down quicker than a lighter aircraft.
It's essentially explained in post #17:
Originally Posted by Microburst2002
The heavy one, flying at max L/D (green dot speed) would make, say 240 kt, whereas the light one would be making only 210 kt. But they are both flying at 300 kt, so the heavy one is 30 kt closer to green dot that the light one. Its L/D ratio is better. Its AoA is closer to min Drag, to green dot.
What he writes for speeds above green dot, is reversed below green dot.

Regards,
HN

Last edited by HazelNuts39; 22nd Nov 2012 at 21:43.
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