Class 2 (2nd Engineer) SC&S 📅 Jul 2025

Exam Question

State how and why the following machinery items are affected when the maximum service speed of a vessel is consistently maintained in heavy weather.

(a) intermediate shafting.

(b) propeller shafting.

(d) Main thrust pads.

Reference Answer

(a) Intermediate Shafting:
Torsional Stress: Resulting from the rapid changes in propeller speed (propeller racing) caused by variations in water resistance in heavy weather.
Compressive Stress: Due to the end thrust transmitted from the propeller.
Bending Stress: Caused by hull movements such as hogging (upward bending) and sagging (downward bending) in heavy seas.

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