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USCG Exam PracticeSingle-screw maneuvering and prop walk

Which type of propulsion system produces NO propeller side force on the stern?

  1. A. A single inboard with a conventional shaft and strut
  2. B. Twin outboards mounted on a stern bracket
  3. C. A single outboard with a long shaft
  4. ✓ A waterjet driveCorrect

Why D is correct

USCG Boat Crew Seamanship Manual §10-A states that a waterjet has no propeller side force at all because its impeller runs fully enclosed in the pump housing, eliminating the unequal blade-thrust effect that produces side force on conventional propellers.

Cited:USCG Boat Crew Seamanship Manual §10-A

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Which type of propulsion system produces NO propeller side force on… — USCG Exam Practice · CaptainsGround