Class 1 (Chief Engineer) Engineering Management 📅 Aug 2023

Exam Question

Improvements in rudder efficiency can considerably conrtibute in improving propulsion effectiveness. Discuss common rudder - eficiency improvement devices/ techniques currently in use referring to the following:

(a) Rudder Thrust Fins

(b) Asymmetric Rudders

(d) Drim Vane Wheels

Reference Answer

### Introduction to Rudder Efficiency
The rudder of a ship operates within the complex hydrodynamic field of the propeller slipstream. This slipstream is not uniform; it is a high-velocity, turbulent, and rotational flow containing significant kinetic energy. Standard rudder designs often generate drag and do not effectively utilize this energy. Improving rudder efficiency is a key component of enhancing overall propulsion effectiveness. This is achieved through Energy Saving Devices (ESDs) that aim to recover lost energy from the slipstream, reduce drag, and improve the hydrodynamic interaction between the propeller and the rudder.
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### (a) Rudder Thrust Fins

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