Propulsion

Achieving a satisfactory shaft alignment is the utmost for the safe and reliable operation of a ship during its lifetime. The accuracy of alignment is important not only for safety but for the costs also during vessel operational time. Methods The four most popular methods of controlling shaft alignment are: - the gap and sag method -  optical or laser sighting -  jacking -  the strain ga...

When talking about propellers, they are described in terms of pitch and diameter. Diameter is obviously the distance from tip to tip. Pitch is the distance the prop would travel through water if the water weren't a fluid.  Fluid dynamics, induced flow, Reynolds number will show  a propeller will never be 100% efficient. Optimizing propeller to get highest efficiency is requiring more than this a...