FINDING METACENTRIC HEIGHT: INCLINATION EXPERIMENT!

INCLINING EXPERIMENT

It is performed on Completed ships, to find out the ship's 

• Metacentric Height (GM)
• Height of centre of gravity (CG) of ship

Conduct of the Experiment

Use of two pendulum, 1 fwd and 1 aft.

• lenth of the pendulum must be as long as possible.
• Bob must be immersed in oil (to dump vibrations).
• 4 masses A,B,C,D must be put on-board.
• The draughts and density are measured at the accurate level.
• Ships mooring ropes are slackened.
• 3 steps: 

1. ABCD on port side; take deflection of pendulum
2. ABCD on stbs side; take defection
3. AB on port CD on dtbd; take deflection

• All deflections are recorded,

Precautions to take,

1. All tanks must be empty
2. Minimum manning on-board
3. Calm weather
4. Mooring ropes slackened
5. All tanks either pressed up full or empty

Stabilograph: Modern method of Inclining Experiment

This device consists of a metal pendulum balanced on knife edges as shown in the pic above.

Advantages,

A permanent record is obtained for all movements of the ship.

Accuracy in measurement comes as a free surprise.

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