i have a airboat that built it is 46inches long and 20 inches wide and has true flat bottom . it is powerd by a weed whip motor with a 14inch pusher prop . i want to remove said motor and put an electric motor and esc on it . what size electric motor should i get and where do i find it .the weight of this boat is approx 10 to 15 lbs. any help would be great thanks