first thing that comes to mind to me in the design is that v-belts rob energy, do as much as you can with direct drive, we have a spare blade motor for our electrac tractor, it's about the size of a tape reel motor from the old reel to reel tapes on computers from the 60's-70's, an E-tec motor might also work well for the blade drive, the wheel drive motor is going to need to be larger then you might think, as you are going to haul around alot of weight, so a 2-3hp motor might be needed.
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