Class 1 (Chief Engineer) Engineering Management 📅 Apr 2022

Exam Question

The power and RPM relationships of the diesel engine and the propeller attached to it are different. Explain with the help of proper sketches how both are matched by choosing the design point for the propeller. What happens when the ship goes into service and the resistance increases?

Reference Answer

### 1. Fundamental Principles of Engine and Propeller Characteristics
The relationship between power and RPM for a marine diesel engine (the power producer) and a fixed-pitch propeller (the power absorber) are fundamentally different. Successful and efficient vessel operation depends on correctly matching these two components.
* **Marine Diesel Engine:** A diesel engine is a constant torque machine. It can produce a specific amount of power at a given RPM within a defined operating envelope. This envelope is limited by:
* **Maximum Power Limit (Line A-B):** The Maximum Continuous Rating (MCR) the engine is designed to produce continuously.

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