[Steely Tom]

This idea was described in Popular Science about 42 years ago. They even had plans for a prototype you could build.

I remember because my father got me a stack of Pop. Science from a friend of his at work, when I was in about third grade. This particular project stands out in my memory.

(steely)

[Plutarch]

Looks like the idea of a centrifugal gun goes way back, for example Winan’s Steam Centrifugal gun from 1861