Class 1 (Chief Engineer) Engineering Management 📅 Sep 2022

Exam Question

Improvements in Rudder efficiency can considerably contribute to improving propulsion effectiveness. Discuss common rudder-effecny improvement devices/ techniques currently in use, with its merits and demerits to the following

(a) Rudder Thrust Fins

(b) Asymmetric Rudders

(d) Grom Vane wheels

Reference Answer

### Introduction to Rudder Efficiency
Improving rudder efficiency is a critical aspect of enhancing a vessel's overall propulsion effectiveness. A significant portion of the energy delivered by the main engine is lost in the form of rotational flow and turbulence in the propeller slipstream. Rudder efficiency improvement devices are primarily designed to recover this lost energy and convert it into useful forward thrust, while also improving the rudder's hydrodynamic performance (lift-to-drag ratio). This leads to substantial fuel savings, reduced emissions, and improved vessel maneuverability.
### (a) Rudder Thrust Fins
**Principle and Operation:**

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