Class 1 (Chief Engineer) Engineering Management 📅 Feb 2023

Exam Question

Improving efficiency of propellers is recognized as a growing means to improve energy efficiency of ships. Discuss any three of the following high-efficiency propellers with its merits and demerits.

(a) Ducted Propellers

(b) Kappel Propellers

(d) Azimuth Propulsion.

Reference Answer

### High-Efficiency Marine Propellers
Improving propulsive efficiency is a critical aspect of enhancing a ship's Energy Efficiency Design Index (EEDI) and reducing operational costs. This can be achieved through various advanced propeller designs that aim to minimize energy losses inherent in conventional systems. A discussion of three such high-efficiency propellers is presented below.
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### 1. Ducted Propellers (Kort Nozzle)

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