Re: OT: Repeatably lobbing "projectiles"

On 11/22/2024 1:21 PM, Jeroen Belleman wrote:

But, to do so completely under automation, without any human
intervention.

 You may want to look at marble machines on youtube. This one
seems much like what you're asking for.
 https://www.youtube.com/watch?v=-AZMmg0qq4A

While it appears to be repeatable, it is recycling the
same projectile.  And, the same target distance (which
falls considerably short of the 20 ft mentioned in my post)
I.e., one would be surprised if it DIDN'T recapture the
projectile on each execution.
But, marbles might be a good choice of projectile; less
surface area to be affected by any air motion, polished
surface -- yet a decent mass-to-size ratio (density).
Seeing them (to verify they have hit the intended target)
would be an issue, though.