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Spine/paradox etc.

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DC:
We all know that the arrow bends around the bow as it's shot. Assuming a properly spined arrow, what starts it bending? Is it just acceleration or is it hitting the bow that starts it?

Pat B:
The push of the string then the inertia against the weight of the arrow causes the arrow to bend. I'm sure some drag is caused by the arrow touching the bow. The initial direction of the inertia is the direction the arrow will go.

DC:
Has anyone got a link to a slow mo video that clearly shows the arrow lifting off the bow and going cleanly around it. I've looked at a bunch and the camera angle is wrong on most of them. I'm not disputing this, I just noticed that the arrow pass on my bows is always scuffed up and it just got me thinking. It could be getting scuffed from drawing the bow though.
I'm thinking of making a jig that would compress an arrow lengthwise to see how much force it would take to start bending the arrow. I think it was you PatB that recently said about how much force it would take to start an arrow bending and how easily it would bend after that. If that's the case and the bow has enough power to start it bending might it not continue bending(cause it's easier now). Maybe the string rolling off your fingers causes a little sideways flick that help start it bending.
I'm waiting for some tung oil to dry so I'm at loose ends here ;D ;D ;D

aaron:
videos in slomo seem (to me) to show that the initial sideways bend has alot to do with the string comming off the fingers. As the string moves from the knuckle crease and off the end of the finger, it moves laterally and the knock goes with it.
Heres a guy in scandanavia with a phantom camera. https://www.youtube.com/watch?v=cP8XVW4H90g

Pat B:
DC, I was going to suggest Googling "Archers Paradox". I'm sure you'd find lots of examples there.  The video Aaron posted shows it well.

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