Deck General · Shiphandling — Twin Screw
A twin-screw vessel can be twisted in her own length by:
- APutting both engines ahead
- BDropping both anchors
- CGoing ahead on one engine and astern on the other✓ Correct
- DUsing the bow thruster only
Explanation
Opposing the engines (one ahead, one astern) creates a turning couple that rotates the vessel about a near-central pivot with little headway—invaluable for maneuvering in close quarters. Outward-turning twin screws also improve backing control.
Authority: Knight's Modern Seamanship
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