USCG Exam PracticeSingle-screw maneuvering and prop walk
A vessel subject to 33 CFR §164.35 is fitted with a controllable pitch propeller and lateral thrust propellers. Which of the following combinations of indicators is required to be readable from the centerline conning position, except when operating on the Great Lakes and their connecting and tributary waters?
- A. Rate of revolution of each propeller only; pitch indicators are optional for controllable pitch vessels
- ✓ Pitch and operational mode of the controllable pitch propellers, direction and amount of thrust of the lateral thrust propellers, and rate of revolution of each propellerCorrect
- C. Pitch and operational mode of the controllable pitch propellers and direction of thrust of the lateral thrust propellers only; RPM indicators are not required when CPP is fitted
- D. Rate of revolution and rudder angle indicator only; thrust and pitch indicators are addressed solely by the maneuvering fact sheet
Why B is correct
33 CFR §164.35(l) requires an RPM indicator for each propeller; §164.35(m) requires a pitch and operational mode indicator for controllable pitch propellers; and §164.35(n) requires a direction and amount of thrust indicator for lateral thrust propellers. All three requirements apply simultaneously when a vessel is fitted with all three systems, and all are excepted only for Great Lakes operations.
Cited:33 CFR §164.35