[Jared Russell]

3.8 HP = 2834 Watts

CIM peak power = 321 Watts

You need the equivalent of 8.8 CIMs for your lawnmower. Plus battery(ies).

(Can you see why an economical electric car is so elusive?)

But wait - there's more. To offset the increased weight that such a large motor (or so many smaller motors) plus a power source, you're going to need to further increase your load of "CIM equivalents". You also are going to need the appropriate gearing so that your motors run at the "peak power" point of their curves for you (roughly 1/2 the free RPMs).