ocr: SAILBOAT CAILBOATS and windsurfers can use the HEELING Owind to propel them in any direction. FORCE This versatility is achieved by shifting a triangular sail around the mast to catch the wind at various angles. The boat MAST shown here is sailing across the wind. The sail produces both a forward WIND thrust and a heeling force, which DIRECTION tilts the boat to one side. SAIL. Sailing Before the Wind -FORWARD THRUST HULL SEE RUDDER. CENTERBOARD ALSO] Sailing Into the Wind
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