The speed would depend greatly on the boat that the motor is placed on. Putting it on a 14 foot narrow lightweight dory, you might get near 15-20 kt. Putting it on something a little less efficient, probably 10 or 12 kt.
You also have to make sure that the propeller is matched to the intended usage. A 10 HP outboard made for trolling on a large boat might not be quite the same as a 10 HP made for cruising.
No way of knowing without much more info.
What mph compare to a 3.3 horse power outboard motor
8-15
Depending on the model, 3600 - 4000 rpm top no load speed.
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.
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.
I have a 14/36 flat boat with a 15 and it goes 26mph with only me and minimal gear.
it has a shaft that go in the motor that moves the boat =-Þ
on my avon air floor inflatable in okinawa with 2 and fishing gear about 4 to 6 mph. avon 310
carburator jets clogged!
I have a 1980,115 Johnson Outboard on a Very Heavy 16ft Crestliner Fiberglass boat,I can get it up to 62kms per hour with 4 people in it .(I used a GPS to test this )