## B

Figure 5.5 Displacement sheet

### 66 FLOTATION AND INITIAL STABILITY

case, the 5 m waterline was determined by using Simpson's rule applied to half ordinates measured at waterlines 1 m apart and at sections taken at every tenth of the length. The calculations were done in two ways. Firstly the areas of sections were calculated and integrated in the fore and aft direction to give volume. Then areas of waterplanes were calculated and integrated vertically to give volume. The two volume values, A and B in the figure, had to be the same if the arithmetic had been done correctly, providing a check on the calculation. The displacement sheet was also used to calculate the vertical and longitudinal positions of the centre of buoyancy. The calculations are now done by computer. The calculation lends itself very well to the use of Excel spreadsheets as discussed in an earlier chapter.

This text has concentrated on the concepts of calculating the characteristics of a floating body. It will be helpful to the student to have these concepts developed in more detail using numerical examples and this is done in Appendix B.

## How To Have A Perfect Boating Experience

Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.

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