A bilgeboard is a lifting foil used in a sailboat, which resembles a cross between a centerboard and a leeboard. In the context of a Fluid flow relative to a body the lift force is the component of the Aerodynamic force that is Perpendicular to the flow A foil is a surface designed to maximize lift (force generated perpendicular to the fluid flow while minimizing drag (force generated in the direction of the fluid In some cases less is more The purpose of this article is to give an overview centreboard is a retractable Keel which pivots out of a slot in the hull of a Sailboat, known as a centerboard trunk (US or case A leeboard is a lifting foil used by a sailboat much like a Centerboard, but located on the Leeward side of the boat Bilgeboards are mounted between the centerline of the boat and the sides, and are almost always asymmetric foils mounted at an angle to maximize lateral lift while minimizing drag. In Fluid dynamics, drag (sometimes called fluid resistance) is the force that resists the movement of a Solid object through a Fluid (a They are most often found on racing scows. A scow, in the original sense is a flat bottomed Boat with a blunt bow often used to haul garbage or similar bulk Freight; cf
When sailing, the windward side bilgeboard is retracted into the hull of the boat, so that it produces no drag. Windward is the direction from which the wind is blowing at the time in question A hull is the body of a Ship or Boat. It is a central concept in floating vessels as it provides the Buoyancy that keeps the vessel from sinking The leeward side foil provides the lift to counter the lateral force of the sail, and converts it into forward motion. Windward is the direction from which the wind is blowing at the time in question The bilgeboards are angled so that as the boat heels, or leans under the force of the wind, the leeward bilgeboard becomes more upright, and provides the greatest possible force in the desired direction.
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