Exam Question
(a) What is right-handed and left-handed propeller? (6)
(b) The pitch angle, measured at a distance of 2 m from the centre of boss, was found to be 21.5°. Calculate the pitch of the propeller. (10)
Class 4 (4th Engineer)
SC&S
📅 Feb 2023
Reference Answer
### Part (a): Right-Handed and Left-Handed Propellers (6 Marks)
A ship's propeller is classified as either right-handed (RH) or left-handed (LH) based on its direction of rotation to produce ahead thrust when viewed from the stern (aft) looking forward towards the bow.
#### 1. Right-Handed (RH) Propeller
* **Definition**: A right-handed propeller rotates in a **clockwise** direction to provide ahead thrust.
A ship's propeller is classified as either right-handed (RH) or left-handed (LH) based on its direction of rotation to produce ahead thrust when viewed from the stern (aft) looking forward towards the bow.
#### 1. Right-Handed (RH) Propeller
* **Definition**: A right-handed propeller rotates in a **clockwise** direction to provide ahead thrust.
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