Daggerboard casing sailboat 2d AutoCAD drawing is given in this model. These are a pair of mouldings that fit under the hull plate in the daggerboard cavity of a Topper Sailboat. They come fitted with Pro Grip to reduce daggerboard slippage and guide the blade through the boat. The shape of the daggerboard converts the forward motion into a windward lift, countering the leeward push of the sail.