11.ship speed

The terms are often very confusing if you are not familiar with them, so I have explained them as best I can. There are some variations, but I have chosen what appears to be the most common practice. The technical informati probably not changed greatly. The terms are often very confusing if you are not familiar with them, so I have explained them as best I can. There are some variations, but I have chosen what appears to be the most common practice. The technical information is taken from Kent's handbook.The knot is a unit of speed, one nautical mile (6080.22 ft) per hour. Multiply speed in knots by 1.15 to get speed in mph. The nautical mile is one minute of arc on a great circle of the earth, assumed to be a sphere of radius 6371 km. It is an annoyance that also appears in wind velocities from official sources, but it does make it easy to find the distances along great circles, which is why it was originally defined.Sea water weighs about 64 pcf, or 1026 kg/m³. Buoyancy is discussed in The action of propellers, though mainly for air, is treated in Faans