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

Exam Question

(a) Define TPC. Explain why TPC for a given draught will vary with the density of the water in which the ship floats. (6)

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

Reference Answer

### Part (a): TPC and its Variation with Water Density
**(i) Definition of TPC**
Tonnes Per Centimetre Immersion (TPC) is defined as the mass in tonnes that must be added to or removed from a ship to change its mean draught by one centimetre. It is a measure of the ship's waterplane area at a specific draught and is used for draught and loading calculations.
**(ii) Explanation of TPC Variation with Water Density**

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