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Maximum energy (Read 246 times)
Sarosh
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Re: Maximum energy
Reply #15 - Jun 21st, 2019 at 5:49am
 
Frondeur wrote on Jun 19th, 2019 at 8:53am:
A guy named Volound claims more than 100m/s on youtube...


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.

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NooneOfConsequence
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Re: Maximum energy
Reply #16 - Jun 21st, 2019 at 12:41pm
 
@vashu:
Backspin for Magnus effect usually takes away from the linear velocity because some of the same energy goes into rotation instead.  All of the energy comes from the same muscles either way.  The Magnus effect could be modeled as a slight reduction in gravitational force for simplicity if you assume the spin rate is the same for the entire flight (which it’s not)
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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
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