Exam Question
(a) Explain the ideal design requirements of a ship's propeller.
(b) Briefly describe the propeller maintenance that should be carried out to prevent fuel being wasted.
Class 2 (2nd Engineer)
MEKG
📅 Sep 2025
Reference Answer
### (a) Ideal Design Requirements of a Ship's Propeller
The ideal design of a ship's propeller is a complex engineering compromise aimed at maximizing propulsive efficiency while satisfying constraints related to strength, vibration, cavitation, and physical installation limitations. The primary goal is to convert the engine's rotational power into thrust with minimal energy loss. The key design requirements are as follows:
1. **Maximum Efficiency:** The propeller should be designed to provide the required thrust for the service speed with the minimum power input. This is influenced by nearly all other design parameters.
2. **Propeller Diameter:**
The ideal design of a ship's propeller is a complex engineering compromise aimed at maximizing propulsive efficiency while satisfying constraints related to strength, vibration, cavitation, and physical installation limitations. The primary goal is to convert the engine's rotational power into thrust with minimal energy loss. The key design requirements are as follows:
1. **Maximum Efficiency:** The propeller should be designed to provide the required thrust for the service speed with the minimum power input. This is influenced by nearly all other design parameters.
2. **Propeller Diameter:**
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