USCG Exam PracticeSingle-screw maneuvering and prop walk
As sternway develops on a single-screw vessel, how does the apparent pivot point change and what is the practical consequence for the coxswain?
- A. The pivot point moves aft, reducing bow swing because the stern becomes the leading end
- ✓ The pivot point moves aft, causing the bow to swing through a greater arc and requiring the coxswain to watch the bow as well as the sternCorrect
- C. The pivot point moves forward, reducing bow swing and making the vessel easier to steer
- D. The pivot point remains fixed amidships regardless of direction of travel
Why B is correct
USCG Boat Crew Seamanship Manual §10-C states that as sternway develops the apparent pivot point moves aft and the bow may swing through a greater arc, so the coxswain must watch the bow as well as the stern and keep firm control of the helm.