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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
Chase
Usually from
harbour speed
12kt
Importante criterion
for determine
back power
Opposes to movement
Ship`s inertia
Longitudinal added mass
Hydrodynamic force
due to forced motion
2 important factor
determine accelerating characteristics
Backing thrust slower speeds
Resistance at high speeds
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
