It mostly depends on the weight or displacement of the craft you put it on. Put it on a little 10 foot flat-bottomed speed boat, you might get 60mph. Put it on a 30 foot pontoon boat, you will do good to get 15mph. It also makes a huge difference what pitch propeller you install. You must match the pitch both to the HP of the motor as well as the size of the boat. Of course, the absolute fastest it will go is if you drop it out of an airplane. Then it will go around 220 mph!
What mph compare to a 3.3 horse power outboard motor
60kph
8-15
150MLP
Yes, but not very fast.
E=mc2
It depends on the size craft it is pushing. A 5hp outboard should run fast enough to plane out say a 10 to 12ft. aluminum boat with one man aboard.
It is a 0.9 horsepower motor and can crush ice in secodns with the fastest speed.
a 75 hp merc goes 19 mph
My best guess would be about 5-8 mph
You will notice on the throttle handle that there are three positions on the legend. "Really Slow", "Start" and "Slow".
A 3.5hp outboard will give you 8mph tops, which would be a normal walk to a slow jog.