What telltales tell you: they indicate where you are on the lift and drag curves

Article Abstract:

Telltales indicate one's position on the lift and drag curves, which pertain to the forces perpendicular to and parallel to the apparent-wind direction, respectively. The point of best lift-to-drag ratio is when the windward telltale is just lifting. Both windward and leeward telltales droop as the angle of attack increases.

Methods, Sailing, Winds

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True grit

Article Abstract:

Boat owners can select either a laminar or a turbulent flow by sanding the boat's hull. However, experiences during boat races show that there is no significant difference between grooved and smooth hulls.

Design and construction, Fluid dynamics, Hulls (Naval architecture), Boats and boating, Boating, Boats

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Oldies but goodies: full-battened mains and stoway masts

Article Abstract:

The advantages and disadvantages of the Stoway mast compared with the full-battened mainsail are examined. The former is inefficient but is easy to use while the latter is faster but requires more work.

Evaluation, Masts and rigging, Sails

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