Class 4 (4th Engineer) SC&S 📅 Oct 2022

Exam Question

(a) Define the terms 'pitch ratio', 'real slip ratio' and 'blade area ratio' (6)

(b) The pitch of a propeller is measured by means of a batten and cord. The horizontal ordinate is found to be 40cm while the vertical ordinate 1.15m at a distance of 2.6m from the center of the boss. Calculate the pitch of the propeller and the blade width at the point (10)

Reference Answer

### (a) Definitions
As a Senior MEO Class 1 Examiner, a full-marks answer requires precise, detailed definitions demonstrating a thorough understanding of propeller geometry and hydrodynamics.
1. **Pitch Ratio (PR)**
* **Definition:** The Pitch Ratio is a non-dimensional characteristic of a propeller, defined as the ratio of the propeller's geometric pitch (P) to its diameter (D).

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