Class 1 (Chief Engineer) Engineering Management 📅 Oct 2024

Exam Question

Improving efficiency of propellers is recognized as a growing means to improve energy efficiency of ships. Discuss the following high-efficiency propellers with its merits and demerits: (16)

(a) Ducted Propellers

(b) Kappel Propellers

(d) Azimuth Propulsion.

Reference Answer

### High-Efficiency Propellers
Improving propeller efficiency is a critical aspect of enhancing the overall Energy Efficiency Design Index (EEDI) of a vessel. The following propellers achieve higher efficiency through different hydrodynamic principles.
### (a) Ducted Propellers (Kort Nozzles)
A ducted propeller consists of a propeller rotating within a non-rotating, hydrodynamically profiled nozzle or duct.

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