Deck General · Rudder & Propeller
A rudder produces a turning force only when:
- AThe vessel is stopped
- BThe anchor is down
- CWater is flowing past it✓ Correct
- DThe engine is stopped
Explanation
The rudder generates a side force from the flow of water across it. With no way on and no propeller wash over the rudder, it is ineffective; a kick ahead can restore steerage by sending wash across it.
Authority: Knight's Modern Seamanship
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