The speed of a boat with 225 horsepower can vary significantly based on factors such as its weight, design, and hull type. Generally, a 225 hp boat can reach speeds between 30 to 50 miles per hour (mph). Performance will also depend on water conditions and load. For more precise estimates, it's best to consult the manufacturer's specifications or test the specific model in question.
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70
A 6 hp outboard will go about fast enough to plane a 10 ft. aluminum boat, with one passenger aboard.
5mph or less
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.
246 knots
225 hp is a measure of power. It does not convert to speed.
About 240 MPH
About 10 to 12 on plane
First, it needs to be mounted on the boat. And the boat determines how fast the attached motor will go. If the boat is wood, then it will likely float deeper in the water, and not be particularly fast. If the boat is a smaller fiberglas one, then the motor and boat will go faster. Based on much boating experience, I would say that most boats could go 30 to 35 mph with the 40hp Merc.
My Water Skimmer 10 ft boat can go 27 mph. Probably the fastest hull design ever for a small boat. Boat is rated for a 15 hp and that can push the boat well over 30 mph. Unsinkable, glass bottom, replace your dinghy or jet ski. www.WaterSkimmerBoats.com