Horse power is not an indication of speed.
The speed of any vehicle depends on a variety of factors.
What medium through which it is moving. (Air, water, land, space)
The power of the engine.
The weight of the vehicle.
The streamlining.
The gear ratios. (If any)
The efficiency of the system.
depending on the hp/weight and traction, street cars 35-50mph
15
about 40mph
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.
50 to 60
165 hp
Answer now.
A 6 hp outboard will go about fast enough to plane a 10 ft. aluminum boat, with one passenger aboard.
59 hp
274 HP
Depends on gearing
about 35 mph i