You may BEST turn a twin-screw vessel about,...

You may BEST turn a twin-screw vessel about,...

Question 1 of 3109366636ee728f7522a1c51810b

You may BEST turn a twin-screw vessel about, to the right, in a narrow channel by using __________.

Question 1 of 31093

Q

You may BEST turn a twin-screw vessel about, to the right, in a narrow channel by using __________.

🔍 Key Concepts

• Transverse thrust and pivot point on a twin-screw vessel • How opposing engine directions create a turning couple without much headway • Effect of ahead vs astern on each screw when turning to starboard in a tight space

💭 Think About

• For a turn to the RIGHT with minimal room, which engine arrangement will tend to swing the bow right and stern left while keeping speed low? • How does putting one screw ahead and the other astern affect the vessel’s ability to pivot almost in place? • In a narrow channel, is it usually better to build up headway and use the rudder, or to generate turning force directly from the propellers?

✅ Before You Answer

• Identify which screw (port or starboard) normally turns clockwise in ahead on a conventional twin-screw vessel and how that affects sideways thrust. • Check which choice creates the strongest turning moment with the least forward/astern movement, ideal for a narrow channel. • Eliminate any option that relies mainly on rudder action at higher speed, since that needs more room than you have in a narrow channel.