10 Mode Index at Sea
10 Mode Index at Sea
Overview
The ship speed in winds and waves is different from that in still water."10 Mode Index at Sea" represent the ship performance in actual seas where the ship actually navigates, as the difference in these speeds (the amount of ship speed decrease).
The amount of ship speed decrease in "10 Mode Index at Sea" is calculated under designed full load and constant power (normal output).
10 mode index at sea
Calculation conditions
The conditions for the waves and winds for which the "10 Mode Index at Sea" are calculated are based on the Beaufort scale so that it does not depend on the sea route. A total of 10 modes are considered, as a combination of 5 modes for the magnitude of waves and winds and 2 modes for direction, and 10 modes are used as indicators for the amount of ship speed decrease.
Size of waves and wind to calculate the "10 mode index at sea" (5 modes)
Direction of waves and wind to calculate the "10 mode index at sea" (2 modes)
Example of "10 mode index at sea"
The table below shows "10 Mode Index at Sea", using a container ship with a length of 300 meters as an example.
Example of "10 mode index at sea" (300m container ship)