Exam Question
(a) Name the different types of rudders. (6)
(b) Draw a labeled sketch of an unbalanced rudder fitted onto a rudder post. (10)
Class 4 (4th Engineer)
SC&S
📅 Oct 2024
Reference Answer
### (a) Different Types of Rudders
Rudders can be classified based on their design, position of the turning axis, and construction. A comprehensive classification includes the following types:
**1. Classification by Axis Position:**
* **Unbalanced Rudder:** The entire rudder blade area is located aft of the turning axis (rudder stock). This design is structurally simple and robust. However, it requires a large torque from the steering gear to operate, as the water pressure acts on one side of the pivot point only. This type is common on older vessels or where simplicity is prioritized over steering efficiency.
Rudders can be classified based on their design, position of the turning axis, and construction. A comprehensive classification includes the following types:
**1. Classification by Axis Position:**
* **Unbalanced Rudder:** The entire rudder blade area is located aft of the turning axis (rudder stock). This design is structurally simple and robust. However, it requires a large torque from the steering gear to operate, as the water pressure acts on one side of the pivot point only. This type is common on older vessels or where simplicity is prioritized over steering efficiency.
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