Transcription of The physics of sqiling - NASA
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The physics of sqiling - NASA
The physics of sqilingBryon D. AndersonSqils ond keels, like oirplone wings, exploit Bernoulli's ond hydrodynomic insighis help designeri creqtefoster Anderson is on experimentol nucleor physicist ond,choirmon of the physics deportment ot Kent Slote University in Kent, is olso on ovocotionol soilor who lecfures ond wrifes obout the intersection behyeen physics ond addition to the recreational pleasure sailing af-fords, it involves some interesting physics . Sailing starts withthe force of the wind on the sails. Analyzing that interactionyields some results not commonly known to non-sailors. Itturns ou! for example, that downwind is not the fastest di-rection for sailing. And there are aerodynamic issues.
Resistive forces A sailboat experiences several kinds of resistance. The first is simply the resistance of the hull moving through water. As the boat moves, it shears the water. Water molecules adhere to the hull's surface. So there must be a shear-that is, a ve-locity gradient-between the adhering molecular layer at rest www.physicstoday.org
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