The linked image shows the central buttocks line of one of my pedal boats with the wave line for 7kts impressed on it:
There is obviously no wave as such inside the hull so this wave line within the section of the hull represents the static pressure under the hull. You can see how the water is crowded at the bow and depressed as it leaves the stern. Anyone who has observed wave making from a hull will be familiar with this.
The hull section is the static trim. In operation at 7kts the hull will have slight bow-up trim due to some lift in the bow and squat in the stern.
This hull is quite fine as it is optimised for 6.5kts with 100kg. The max BWL is 250mm:
The wave pattern depicted is not stylised. It is the result of some complex mathematics that models the real world reasonably accurately.
The stabilisers ride above the surface and are set to just catch the diagonal wave from the hull. This wave is about 20mm high at the aft end of the stabilisers and there is some squat to allow for as well. When set properly for the load the stabilisers occasionally skim the surface so offer next to no drag.
Rick Willoughby
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