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→A/B Ratio
The wetted area (WP) of the boat’s hull is an indicator of friction through the water. WP is very important in a submarine but less so in a surface ship, where wave resistance is more important.
== A/B Ratio ==
A/B, the ratio of the area above the water to the area below the water, is a deprecated measure of stabilitythat is not used by marine architects. It is a gross rule of thumb that is easily misused. Stability can be better predicted using computer programs that consider many factors. A For argument's sake, a lower ratio, say below 2.5, is inherently more stable than a top-heavy boat with a high A/B ratio of say 3.0 or more.
== Ballast to Displacement Ratio ==
[Based on sail boats]
