1hp =55 to75 pounds of thrust its all prop dependent as most outboard props wont let a engine rev out at displacement speeds
thats at 100 percent throttle on the electric, which will drain around 50 amps per hour
so on a 100 amp hour lead acid battery you will get 1 hour of run time equal to 1 horsepower
a small 4hp extra longd shaft with a sail boat prop would be the best option for actually being usable for the intended role
or something like this
https://www.yamaha-motor.com.au/prod...ur-stroke/t9.9
https://www.tohatsu.com.au/node/1678
a 55 pound unit is just sufficient on my 4.2m heavy tinny, Gazza you will need a 24v 36v 80-130 pound unit on your boat to be a useful tool and just not wasted money