Re: 12 ft. aluminium weight and motor capacity? i have a 12 ft aluminum with an 8 hp on it. it's usually just me in the boat, so i am having weight distribution problems with the motor, myself, two batteries, and a gas tank all in the back.. The uscg, abyc, canada and iso all rate capacity for boats under 20 feet (6m) the same way. it is not based on a specific weight of a person such as 150 or 160 pounds. capacity on small boats is based on displacement weight. this is the amount of weight it would take to sink the boat.. I have a v-hull 12' aluminum montgomery ward sea king, though a later model--the capacity plate shows either 4 persons, upto 500 lbs or a total weight including motor, persons and gear upto estimated 777 lbs. hp is 15..
Kinda depends on other things, there shoulod be an allowed weight # or capacity # on the transom, or aft, port. like if the boat says it can hold 6 people, but the weight or load capacity is 600 lbs, they better be some skinny people and leave the motor on the land.. For example, for a boat 18 feet long by 6 feet wide, the number of persons is 18 times 6 (or 108) divided by 15, which equals seven 150-lb. persons (or a total person weight of 7
