USCG Exam PracticeSingle-screw maneuvering and prop walk
While backing a single-screw vessel, the stern continues to swing despite full rudder. What corrective action is described as appropriate?
- A. Increase astern power to build sternway faster so the rudder becomes more effective
- B. Clutch to neutral and allow the vessel to coast until the swing stops
- ✓ Apply a short burst ahead, using side force and discharge current across the shifted rudder to walk the stern backCorrect
- D. Shift the rudder amidships to reduce drag and allow sternway to build
Why C is correct
USCG Boat Crew Seamanship Manual §10-C states that if the stern's swing cannot be held with rudder alone, a short burst ahead uses side force and discharge current across the shifted rudder to walk the stern back the other way, using no more power than needed so sternway is not killed.