Dark-Harbor-Sail-Ratios
(Gaff Rig Sailplan)

 Sail-Plan Ratio Descriptions


Go to Dark Harbor Links

Submit a Comment


Vs/VT Theory

gaff-ratio-1.jpg

12 knot Heel Theory

gaff-ratio-2.jpg

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.

gaff-ratio-6.jpg

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.

gaff-ratio-5.jpg
gaff-ratio-7.jpg

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.

gaff-ratio-3.jpg

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.

gaff-ratio-4.jpg

Go to Dark Harbor Links

Submit a Comment



All Copyrights Reserved - Metalsailboats.com

2009 - 2025



New - Ongoing

Take part in the redesign of the classic sailboat Dark Harbor for Aluminum construction

Go to Dark Harbor Redesign



Steel and Aluminum True Round Building Plans

To promote the concept of 'Bezier Design and Construction', complete Building Plans, for all Bezier designs can now be downloaded free of charge.

Click Here



About Displacement Hull Speed

Click Here

Bezier Hull Configerations

How 'Bezier Chine Desin and Construction ' can create full-size pattern for 'Radius Chine' designs.

Click Here

Converting a Hard Chine Hull to a True Round Hull

Using 'Bezier Chine Design and Construction'to convert an existing Hard Chine to a True Round Design.

Click Here

English Wheeling

How 'Bezier Chine Design and Construction' creates Full Size patterns to guide the English Wheeling forming process.

Click Here