(a) What is the purpose of conducting inclining experiment on a new vessel? (6)
(b) A ship of 12400 tonne displacement is 120 m long, 17.5 m beam and floats at a draught of 7.5 m. The propeller has a pitch ratio of 0.75 and, when turning at 100 rev/min, produces a ship speed of 12 knots with a real slip of 30%. Calculate the apparent slip, pitch and diameter of the propeller. The wake fraction w may be found from the expression, w = 0.5Cb – 0.05 (10)
Reference Answer
### (a) Purpose of the Inclining Experiment The primary purpose of the inclining experiment is to determine, with a high degree of accuracy, the lightship characteristics of a newly constructed vessel. These characteristics are the lightship displacement (weight) and the precise location of its center of gravity (KG and LCG). This data forms the mandatory and fundamental basis for all subsequent stability calculations throughout the vessel's operational life. **Key Objectives and Principles:** 1. **Determination of Lightship KG:** The core objective is to find the vertical height of the center of gravity (KG) of the empty ship. This value is the starting point for calculating the KG for any loading condition.
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