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Direct and Indirect Towing Method - Coggle Diagram
Direct and Indirect Towing Method
Steering control
depends on
Distance BTW Propulsion and Towing Point
Distance BTW Centre of Pressure and Towing Point
Tug`s engine power
Thrust performance in pulling direction
Tug`s underwater plane
Direct method
Better
Smaller C-T compared to P-T
C generates less force and P generates pore moment
Indirect method
Tractor
CT distance small
Low steering power
to keep in effective position
Reverse / ASD
High CT distance
High steering power
to keep effective position
decreases towline force
Need to bring
Centre of Pressure more Forward
Skeg
Bulbous bow
SPEEDS HIGHER than 5 to 6kt
Reason why
Tractor is better for indirect
