Exam Question
(a) What is a right-handed and a left-handed propeller? (5)
(b) With the aid of simple sketches explain Rake, Skew and Pitch of the propeller. (6)
(c) What are the advantages and disadvantages of CPP? (5)
Class 4 (4th Engineer)
SC&S
📅 Sep 2025
Reference Answer
### (a) Right-handed and Left-handed Propellers
A propeller's 'handedness' refers to its direction of rotation to produce ahead thrust. The reference point for observation is always from the stern of the ship, looking forward towards the bow.
**1. Right-Handed (RH) Propeller:**
* **Definition:** A right-handed propeller rotates in a **clockwise** direction when providing forward (ahead) propulsion, as viewed from the stern.
A propeller's 'handedness' refers to its direction of rotation to produce ahead thrust. The reference point for observation is always from the stern of the ship, looking forward towards the bow.
**1. Right-Handed (RH) Propeller:**
* **Definition:** A right-handed propeller rotates in a **clockwise** direction when providing forward (ahead) propulsion, as viewed from the stern.
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