Hyvässä slöörissä · sailing dinghy cruising

Centerboard

The centerboard of SCAMP can be shaped two different ways. The easier way is to use a flattened foil when thickness is chosen to be 33 mm. More challenging way is to shape the centerboard according to NACA 008-34 foil when the thickness has to be greater, possibly 36 mm. True foil improved hydrodynamics of the underwater parts that presumably makes the boat bit faster. There is also a separate centerboard and rudder kit available that would save you from the joy of shaping.

I chose the flattened foil with thickness of 33 mm. A combination of 12 mm + 9 mm + 12 mm plywoods seemed like a good way to go.

Cutting the pieces

Lofting the centerboard was the very first part of the project. For drawing the first plywood sheet I used a 120 cm square, an ordinary ruler and self-made cardboard molds for drawing the circular corners. This concept worked fairly well, although a smaller and more agile square would be handy in addition to the big one.

Outline of the centerboard and the used tools

More to be translated from the Finnish page.

Next: Jig
See also: Centerboard trunk (stage 2)
Building Merisirri