I have an old Startrite with 12" diameter wheels. Designed for wood I was cutting 1/2 inch aluminium with a skip tooth blade. The blades didn't last long.
I have bought a new, 47 rpm gear motor with 80Nm of torque from Geared Motors UK which will take it down to 2.5 ft/s 150 ft/min which sounds just about perfect to me.
It seems I can buy most any blade in any length, I am going to enjoy this!
80Nm translates to a 118 lbf push on the blade. Wonder if it will slip 