Not with the current motor.

But with a simple batterydrill it went to 1000 rpm inside a second.

Oh well, I alway can make a new belt-disk, if I would make a 160mm one, the ratio goes up to 3-1. (end speed, theoreticialy 1640 rpm then, still a nice wallop)

It's not that the belts are a problem. I weld them myself to the right length. And buying it per spool is cheaper.