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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