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Vmax...
My interpretation is that Vmax rule was intended to be a safety measure -- especially from with regard to tethered projectiles shot at the bar by springs (think grapling hooks & crossbows ;-) and with regard to largish longish arms hitting the bar after a long wind up (think executioners axe ;-)
Given this, I really think that it is the veritical component of the "exit velocity" of anything shot at the bar and the vertical component of any windmill arm swinging at the bar.
That is how I'd call it anyway.
Joe J.
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