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Capabilities and Limitations - Tug at Ship's Side Pushing - Coggle…
Capabilities and Limitations - Tug at Ship's Side Pushing
Efficiency
How well can push
without increasing ship's speed
The better can work
at right angles
Relation BTW distances
Point of Push to Propeller (a)
Point of push to Centre of Pressure (b)
The closer C to push point
Better
As long as Propeller is far aft
Will reduce forces to maintain 90°
Reverse Tractor
High Efficient
C more forward
Propulsion far aft
Conventional
Can't cope at more than 3 or 4 kt
Low centre of pressure
Tractor
Depends on Ratio a/b
Maximum Heeling Angle
Needs to mantain
low pushing point
to reduce heeling
Height of Centre of pressure also influences
