Exam Question
(a) With a simple sketch of a fixed pitch propeller explain Rake, Leading and Trailing edge. (10)
(b) What are the advantages and disadvantages of a Controllable Pitch Propeller. (6)
Class 4 (4th Engineer)
SC&S
📅 Sep 2024
Reference Answer
### (a) Fixed Pitch Propeller Terminology
A fixed pitch propeller is a solid casting where the blades are integral with the hub, and their pitch angle cannot be changed during operation. The following terms are critical for defining its geometry:
**1. Rake:**
* **Definition:** Rake is the angle of inclination of the blade's reference line (the line connecting the blade root to the blade tip) with respect to a line perpendicular to the propeller axis, viewed from the side.
A fixed pitch propeller is a solid casting where the blades are integral with the hub, and their pitch angle cannot be changed during operation. The following terms are critical for defining its geometry:
**1. Rake:**
* **Definition:** Rake is the angle of inclination of the blade's reference line (the line connecting the blade root to the blade tip) with respect to a line perpendicular to the propeller axis, viewed from the side.
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