I see. Not Black and Decker then.(Although it does look a bit like a B&D from the side, or perhaps it's NuTool I'm thinking of here).
Do you have a 3-phase supply or are you are using an inverter / rotary converter? I use a single to 3 phase inverter which gives variable speed as well as 3 phase and it's brilliant. Only handles about 2 HP though. A 20" saw blade is way outside my league.
Do you think you'll use it to full capacity, whatever that is - about 8" depth of cut? Serious stuff.
K