Exam Question
(a) Name the different type of rudders. (6)
(b) Draw a labeled sketch of an unbalanced rudder fitted onto a rudder post. (10)
Class 4 (4th Engineer)
SC&S
📅 May 2023
Reference Answer
### (a) Types of Rudders (6 Marks)
Rudders are classified based on the position of their turning axis relative to the blade area, their structural arrangement, and their hydrodynamic profile. A comprehensive classification includes:
**1. Classification by Balance (Axis Position):**
* **Unbalanced Rudder:** The entire rudder blade area is located aft of the turning axis (the centerline of the rudder stock). This design is structurally simple and robust. However, it requires the maximum torque from the steering gear to turn, as the hydrodynamic pressure creates a large turning moment about the stock.
Rudders are classified based on the position of their turning axis relative to the blade area, their structural arrangement, and their hydrodynamic profile. A comprehensive classification includes:
**1. Classification by Balance (Axis Position):**
* **Unbalanced Rudder:** The entire rudder blade area is located aft of the turning axis (the centerline of the rudder stock). This design is structurally simple and robust. However, it requires the maximum torque from the steering gear to turn, as the hydrodynamic pressure creates a large turning moment about the stock.
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