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Fletching and dynamic spine

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WhistlingBadger:
Howdy, boys.  So, I'm playing around with some bare shafts again and have some 44#s flying well with 235gr heads.  Question:  Does adding fletching affect dynamic spine, and if so, which way?  I've been told before but can't remember.

Thanks!
T

Lehtis:
One inch longer fletching equals 5 pounds stiffer arrow roughly... like going from 3" to 4" or 4" to 5"...

WhistlingBadger:
So a four inch fletched arrow will have a dynamic spine 20# stiffer than a bare shaft?  That's a pretty big difference!

Pat B:
With 235gr up front you may not even notice any difference with different fletch lengths.

DC:
Can someone explain why fletching length would affect spine? As near as I can figure spine, static and dynamic, is all about bending the arrow around the bow. This would be mass and acceleration. Fletching change adds very little weight. I can't see how the aerodynamics of the fletching would have anything to do with spine. Puzzled :)

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