1) The amount of towing force required is not related to achieving a given transit speed but is defined as the amount of towing force needed to hold the towed unit against a given set of environmental conditions.
2) You may get the data showing the amount of towing force required to achieve a given speed in still water conditions and this may be use in calculating transit times but the ability to hold the towed unit against a given set of wind,wave and current forces from right ahead is the more useful data, as far as the tug master,tow master and those involved in planning and carrying out the tow are concerned.
Standard limiting conditions
Wind speed 20 m/s(40 knts) from ahead
Waves height 5 mtrs
Current 0.5 m/s (1 knt) from ahead
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