I have seen these and most are gas. If you was to build one hobby wise I think a 48s would get the job done but your using a much larger motor and prop :). I'd say you could probably get away with three car batts though :)
I've never seen these . Do you have a link ? If also think about gas for it if your really going to pull a heavy load as I'm sure the lipo would go fast under a load such as this lol
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