WING SHAPE CAUSES PRES­SURE DIF­FER­ENCE

Science Illustrated - - ASK US -

The top side of the dagger-board pro­file is curved like a plane wing. The wa­ter flows faster on the top side than on the lower side of the dag­ger­board, pro­duc­ing a pres­sure dif­fer­ence that lifts the boat.

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