About 10 to 12 on plane
19 mph
it is very fast
2500 lbs no motor
25-30 horse power.
32-37
It depends a lot on the size of the boat. If it say, a 12 foot boat, probably about 7 or 8 knots (about 10 mph). On a bigger boat slower. As was said these small engines are used mainly for dinghies and for fishing. Answer: I have a 8 foot fiberglass dinghy with a 4 Hp outboard. My GPS says 11km/h under full throttle on a calm lake.
The right size for an electric outboard motor for a 10 foot fishing boat seems to be 4 - 5 - 6 hp, 8 - 9.9 hp or 15 - 20hp. It simply depends on what kind of fishing boat it is.
+/- 380lbs
The smallest motor for a 16 foot Lowe boat is about 30 horsepower. The maximum size should be no more than 100 horsepower.
Speed is dependant on a number of factors. Most importantly the size, type and weight of the boat that it is on and the number of people on board. A 50 HP outboard will push a small aluminum fishing boat a lot fast than it will a 20 ft fiberglass boat. I have a 50 HP 2 stroke that will push a 16 foot aluminum boat 35 MPH.
The answer is relative. I have a 4 1/2 HP motor on my 12 foot aluminum boat. It gets me where I need to go.
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!