USCG Exam PracticeTwin-screw vessel handling
On a twin-screw vessel, what is the immediate effect of any difference in thrust between the two engines?
- ✓ A change in the vessel's headingCorrect
- B. A reduction in discharge screw current velocity
- C. A shift of the pivot point forward
- D. An increase in propeller side force on both shafts
Why A is correct
USCG Boat Crew Seamanship Manual §10-D states that any difference in thrust between the two engines changes the boat's heading. The other effects listed are not described as the immediate result of a thrust differential.