Boats/ships don't measure speed in mph.
The nautical term for a unit of speed when sailing or navigating a boat is the word knots. To measure a knot it is the unit of speed equal to one nautical mile approximately 1.151 mph.
because the name speed boat means its a fast boat why else would it be called a speed boat
Miles per hour, like a car. Knots, like a boat or airplane.
they measure time on a boat with a chronometer
The closer to the maximum speed the boat gets the harder it is to increase the speed.
speed boat
A speed boat is generally between 14ft and 22ft in length.
Knots one nautical mile per hour there are 1 1/8 of a nautical mile in a statute mile Originally measured by throwing a piece of wood attached to a piece of rope over the back of a boat and counting how many knots went past in a given time. These days it is more normally measured by: a/ using a pitot static tube which measure difference in pressure and uses bernoulli's equation (enter into wikipedia as is easier to read) to find the velocity. b/ Some form of propeller (technically impeller) which is suspended under the boat. The passing water turns, the speed of rotation is measurred and this gives you the speed of the boat. c/Using ultrasonics to measure the speed that small bubbles of air in the water passing under the boat go past.
The first speed boat was invented in 1910 by David Harmon
180 miles per hour is the maximum boat speed registered
on a speed boat to stop it from you coat it with oil i thimk