Frondeur wrote on Jun 19^th, 2019 at 8:53am:


although possible he doesn't provide any evidence, I regard it as a good clickbait.

vashu1

why do you use Cd=0.47? It changes a lot with a more streamlined shape, lead could possibly be 0.05

Cd will lower if you reach a certain initial speed for a given projectile , giving you some extra range.  google Cd to Reynolds number graph or https://en.wikipedia.org/wiki/Drag_coefficient

when filming the 160m target video I realised that a heavier round stone falls short to a much lighter but also elongated stone, the difference was big not because of speed but because of drag. For max range I would use a biconical with a good spiral not a ball shape even with backspin. the only reason to throw a ball would be if I can't control the spin and I dont want it to affect the trajectory/ range.

also a guy sent me this via facebook (picture below)
"Roman glands or acorns thrown by a sling can go over 310km / h" which is 86m/s , I know no more about this.