With rudders amidships and negligible wind,...

Question 1 of 2707066636ee728f7522a1c5187f7

With rudders amidships and negligible wind, a twin-screw vessel moving astern with both engines backing will back __________.

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Question 1 of 27070

Q

With rudders amidships and negligible wind, a twin-screw vessel moving astern with both engines backing will back __________.

🔍 Key Concepts

• How propeller rotation affects the stern when a vessel is moving astern • The difference between single-screw and twin-screw behavior when backing • Effect of rudders when they are amidships and water flow is from astern, not ahead

💭 Think About

• Think about whether the rudders have much steering effect when the vessel is already moving astern with water flowing from stern to bow. • Consider how two propellers, one on each side, backing at the same power will influence the ship’s tendency to swing, compared with just one propeller. • Ask yourself: if forces on both sides are equal and opposite, what would the overall movement of the vessel look like?

✅ Before You Answer

• Verify what rudders amidships implies about steering input. • Consider whether propeller side forces tend to cancel or add when both screws are backing together with equal power. • Check if the question mentions any difference in engine rpm or direction between port and starboard engines that would create a turning moment.