Depends if you put it on an 8 foot skiff or a 40 foot barge.
There are too many variables here to give you a solid answer, but my 21 foot Santana Sail Boat (weight approx: 1600lbs) goes 8-10mph.
Not very fast, possibly about 25 mph.
A 6 hp outboard will go about fast enough to plane a 10 ft. aluminum boat, with one passenger aboard.
10 15 mph depend on size of boat
the 20hp Mercury outboard motor runs at the most at 8mph on a good 14ft to 16ft aluminum boat. Mercury.co
depends on the boat is it a v hull or flat also the weight you are carrying you can probably gp at least 40
go to www.nada.com look under consumer then outboard motors find the model number and year
8-15
What mph compare to a 3.3 horse power outboard motor
Not very fast at all because of all of the weight but the 150 pounds would almost even it out.
The 15 Mercury, on a 14' boat, would easily plane out with one passenger aboard. This combination should also work out with two passengers, though it won't be a speedster.
150mph