USCG Exam PracticeSingle-screw maneuvering and prop walk
When backing a single-screw vessel, what is the recommended first action before engaging astern power?
- A. Use a short burst ahead to build discharge current across the rudder before engaging astern
- ✓ Apply full rudder toward the side that opposes the expected swingCorrect
- C. Apply full rudder toward the side to which propeller side force will swing the stern
- D. Hold the rudder amidships until sternway is established, then apply rudder
Why B is correct
USCG Boat Crew Seamanship Manual §10-C specifies that the workable sequence begins with applying full rudder toward the side that opposes the expected swing before starting astern. The rudder has little effect until sternway exists, but pre-positioning it prepares for when sternway builds.