Dark-Harbor-Sail-Ratios
(Gaff Rig Sailplan)
Sail-Plan Ratio Descriptions
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Vs/VT Theory
12 knot Heel Theory
Sail Area/Wetted Surface
The crossing of a line drawn up from the DWL in Ft scale and a line drawn from the left scale will indicate Light Wind Performance.
Sail Area/Displacement 2/3
The crossing of a line drawn up from the DWL in Ft scale and a line drawn from the left scale will indicate Normal Sailing Performance.
Also see the following chart which indicates the Design type.
Wind Pressure Coefficent
The crossing of a line drawn up from the DWL in Ft scale and a line drawn from the WPC at 20-degrees scale will indicate the stiffness of the hull.
Also see the enclosed Wind Pressure Coefficients chart.
Dellanbaugh Angle
The crossing of a line drawn up from the DWL in Ft scale and a line drawn from the Dellanbaugh side scale scale will indicate the stiffness or tenderness of the hull.
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