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Ships trial- Turning circle diameter

Factors Affecting Turn: When a vessel fitted with a right-hand fixed propeller, she would benefit from the transverse thrust effect, and her turning circle, in general, will be quicker and tighter when turning to port than to starboard.

The following factors will affect the rate of turn and the size of turning circle:

1. Structural design and length of the vessel.

2. Draught and trim of vessel.

3. Size and motive power of main machinery.

4. Distribution and stowage of cargo.

5. Even keel or carrying a list.

6. Position of turning in relation to the available depth of water.

7. Amount of rudder angle required to complete the turn.

8. External forces affecting the drift angle.


Turning cicle diameter for a typical containership

Fig. TCD manoeuvres. Ship run at full speed with rudder helm 35 P or S throughout this trial.




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A deeply laden vessel will experience little effect from wind or sea when turning, but a vessel in a light or ballasted condition will make considerable leeway, especially with strong winds. ....

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When a vessel fitted with a right-hand fixed propeller, she would benefit from the transverse thrust effect, and her turning circle, in general, will be quicker and tighter when turning to port than to starboard. ....

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