The way I see it.........
Build the boat at 80 pounds or less...
Drop on a 4 hp motor at 55 pounds...
( 3 1/2 weighs 35 pounds) . Combined weight with me in it with the boat at 100 pounds is 359 pounds with the 4 hp one , plus the small gas can. That depends on how much gas you need as far as the weight. No idea on my part.
Camping gear ... Might be 200 pounds with everything including a weeks worth of water and food , probably less.
My small canoe or the pirogues handle that camping load with no problem with this as a wider pirogue and a motor on it should draft less or at the max the same amount of water to float it as the boats I paddle without a motor .... About 3 inches with the load balanced.
So 559 pounds (
Providing the boat weighs 100 pounds ), with a 4 hp pushing it....... No Problem. 1 Hp for every 137 pounds. Can you say ... Hold on to your hat .....see you later Gator. :lol:
Chuck...
PS ... I am figuring on the heavy side for everything , rather error on the side of caution.