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In the Mass Calculation entity, which is a subgoal of the total solution, the mass and the centre of gravity of the whole system will be calculated. These quantities depend on the mass and centre of gravity of both the ship itself (Light Ship Weight) and the cargo it carries (Mass Cargoes). The total mass is calculated by the summation of all mass components. The centre of gravity of a system of components is defined as the average of their positions, weighted by their masses. This method is used at every level (entity/subgoal) of Mass calculation.

At the level of entities In the entities Mass Calculation and Light Ship Weight (and Mass Cargoes) no input is requested from the user.The first 'stop' in the calculation process is in Mass hull.

• If you have not done so already in the previous part of this tutorial, click Next. In any case, the screen should now look like this:

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