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USCG Exam PracticeSingle-screw maneuvering and prop walk

When backing a single-screw vessel, which force is the MAJOR obstacle to controlling the direction of movement?

  1. ✓ Propeller side forceCorrect
  2. B. Suction screw current
  3. C. Frictional wake
  4. D. Rudder authority

Why A is correct

On a single-engine vessel, propeller side force is the major obstacle to backing where intended, and the rudder has little effect until sternway exists. (USCG Boat Crew Seamanship Manual §10-C)

Cited:USCG Boat Crew Seamanship Manual §10-C

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When backing a single-screw vessel, which force is the MAJOR obstac… — USCG Exam Practice · CaptainsGround