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Push-Pull x Towing on Line - Coggle Diagram
Push-Pull x Towing on Line
Push-Pull Advantages
Act quick with short response time
Negated effects
effects of proximity to bow at speed
Interaction forces
Push-Pull Disadvantages
Short towlines
problem in wave conditions
Loss of pulling effectiveness due to tugs wash on hull
If winches, can lengthen the line
Conventional tug
low astern power
Bad for narrow passages
No flexibility in switching sides
Short turning lever when turning
Can be jammed BTW ship and berth due to high wind
Tug master with little insight into manoeuvres
Towing on Line Advantages
Small wave effects due to long line
Can be used in narrow passages
Tugs Forward and Aft
Can moor both sides
Operate in safe side when cross winds
Large turning lever
Master has better view
Can assist pilot
Informing distances Aft / Forward
Towing on Line Disadvantages
Risks of interaction
passing line near the bow
Longer response times