To convert N/KN (Newtons/Kilonewtons) to tonnes, you can use the conversion factor of 1 N = 0.00010197 tonnes and 1 KN = 0.10197 tonnes. This means that to convert N to tonnes, you need to divide the value in N by 9.80665, and to convert KN to tonnes, you need to multiply the value in KN by 1000 and then divide by 9.80665.
Bollard pull is the maximum pulling force that a vessel can exert on a static object, such as a bollard. It is an important measure of a vessel's power and capabilities, as it is used to determine its ability to maneuver and perform tasks such as towing, pushing, and mooring.
Bollard pull is calculated by multiplying the vessel's brake horsepower (BHP) by its propeller efficiency and then dividing by the speed of the propeller in knots. The formula is bollard pull (in tonnes) = (BHP x propeller efficiency) / propeller speed (in knots).
There are several factors that can affect bollard pull, including the vessel's size and weight, the design and efficiency of its propellers, the condition of its engines and propulsion systems, and external factors such as wind and current.
Bollard pull is an important consideration in ship design, as it helps determine the appropriate size and power of the vessel's engines and propulsion systems. In ship operations, bollard pull is used to assess the vessel's capabilities and limitations, and to plan and execute tasks such as towing and mooring safely and efficiently.