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Stopping Distances - Coggle Diagram
Stopping Distances
Time to dead in water
Ahead thrust to Astern thrust
Astern thrust constant
Inversely proportional
to Retarding Force
Slow ships - Propeller
High speed ones - Resistance
Head Reach
Distance
in original direction
to come to stop
tests show
modest speeds
same distance for
Straight Line
Curved trajectory
Usually from
harbour speed (12kt)
2 important factor
Resistance
Backing thrust
Opposes to movement
Ship`s inertia
Longitudinal added mass
Merchant ships Turbine
80-50 backing power
Astern
80% ahead torque
50% ahead RPM
Depends on Engine
Bad for Direct Drive diesel-powered engines
Limited compressed air supply
