Rotary tumblers

[plain ol Bill]

I am building a tumbler using an old 100# propane tank.  I am going to line the inside of it with some old conveyor belting I have stuck out in the woods to help control noise. I will be using punch blanks from an iron worker for media. My question is:

WHAT RPM TO TURN THIS THING??

[Irondragon Forge ClayWorks]

The large tumblers I have used turn between 20-30 RPM. The smaller rock tumblers turn 8-12 RPM.

I can't control the wind, all I can do is adjust my sail’s.~ Semper Paratus