The overall efficiency of a centrifugal pump is simply the ratio of the water (output). power to the shaft (input) power and is illustrated by the equation below. Î· = P W / P S where Î· is efficiency, P w is the water power, and P s is the shaft power.
While talking about difference between a ship and a boat, the first thing that comes to oneâs mind is their sizes. Traditionally people consider a ship as a large ocean going vessel, whereas boats are comparatively quite smaller in size.
There really are no significant differences between a freshwater boat and a saltwater boat. THere are some systems that saltwater boats employ to combat the above. Do a search on bottom fouling and Mercruiser Sea Core to better understand some of the problems and how designers are trying to overcome them.he reference to fresh vs. salt water is the boat's history, not it's design or components. My boat has been in salt water for 20 years, so it is a 'salt water' boat. A closed cooling system is a bit better for salt water.