Ch. 12 Flashcards
Is the pivot point always near the ships center of lateral resistance?
No, the pivot point may coincide with the CLR when the ship is stopped, but once a lateral force is applied the pivot point moves in response to the applied force.
What is the effect on the ship’s pivot point of one tug pushing at the bow?
The pivot point moves away from the tug end of the ship toward the ship’s stern.
How many ship lengths will it take to turn a ship with one tug pushing at the bow?
Approximately two ship lengths
What is the effect on the ship’s pivot point of two tugs pushing with equal force one on the port bow and one on the port stern of a stopped ship?
The pivot point will remain approximately amidships.
In order to move a stopped ship laterally the external forces applied must have _____ on either side of the ships pivot point?
Equal and opposing leverage
What is drift angle?
Drift angle is the angle between the ships centerline and the direction in which a ships bridge is actually travelling in a turn.
Why is the knowledge of the drift angle useful to a pilot?
Drift angle serves as a visual cue for the pilot to estimate the degree of lateral motion or slide that a ship has as it execute’s a turn.
