PPRuNe Forums - View Single Post - Why does an aircraft descend quicker when it is lighter?
Old 18th Apr 2010, 01:35
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jfkjohan
 
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Capt. Pit Bull & the others.

Dear all,

I have actually had the same question on my mind last week when I was reading through Gary Bristow's "Ace" book as well. I remember in school, we learned that "the heavier aircraft reaches the ground faster than a lighter aircraft".

It stood out to me when this question came out, and I can now SOMEWHAT understand/appreciate why --- drag?

Please help me (and others) understand this. So, to keep it simple, the heavier the aircraft, the more lift it requires hence the higher AoA thus the more induced drag it generates.

So if the lighter & heavier aircraft had the SAME AoA, the heavier aircraft would descend faster due to momentum/kinetic energy?

This has been bugging me since last week! Please help, anybody! Thanks!

@jfkjohan
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