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Which of the following hull shapes would normally provide a directionally stable ship?

A) A short ship with a wide beam
B) A long ship with a wide beam
C) A long ship with a narrow beam
D) A short ship with a narrow beam

Answer :

In ship design and marine engineering, the hull shape is crucial in determining the ship's directional stability. Directional stability refers to a ship's ability to maintain a set course without continual steering corrections.

Let's examine the provided options:

A) A short ship with a wide beam

B) A long ship with a wide beam

C) A long ship with a narrow beam

D) A short ship with a narrow beam

To determine which hull shape would provide the best directional stability, let's consider the factors:

  1. Length of the Ship:

    • Longer ships generally offer greater directional stability. This is because a longer ship has a greater length-to-beam ratio, which allows it to track more steadily through the water, reducing the tendency to yaw or turn sideways.
  2. Beam or Width of the Ship:

    • A narrow beam is often associated with greater directional stability but may reduce initial stability, which is the ability to resist rolling.

Given these points, Option C: A long ship with a narrow beam is typically regarded as providing better directional stability. The longer length helps maintain a straightforward course, and the narrow beam can aid in reducing lateral water resistance, helping the ship maintain its heading.

In summary, a long and narrow hull is generally more directionally stable, allowing the ship to move forward with minimal lateral deviation, which is desirable for navigation.

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