The Science of Sustainability

The Physics of Sailing

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Northern California has a storied, 500-year history of sailing. But despite this rich heritage, scientists and boat designers continue to learn more each day about what makes a sail boat move. Contrary to what you might expect, the physics of sailing still present some mysteries to modern sailors.

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Category: Engineering, Physics, Television

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Josh Rosen

About the Author ()

Josh Rosen was the TV Series Producer for QUEST from 2007-2009. He is a senior writer and producer specializing in documentary series and factual programming. Over the last decade he's produced a wide range of non-fiction hours, covering everything from Antarctic expeditions to Civil War history. With a background in feature film, Josh spent four years working with legendary German filmmaker Werner Herzog on multiple documentaries, including the Emmy-nominated "Little Dieter Needs to Fly," "Wings of Hope," and "Klaus Kinski: My Best Fiend." His more recent projects are currently airing on the Discovery Channel, the National Geographic Channel, the History Channel, and worldwide through Granada Media and RDF Television.
  • uri neta

    want to start course of sailing physics for 15 age children from poor families and to get them drive sail boats

  • Zoobernarf

    Great video! Excellent relation to Bernoulli principal that is done much better than other online sources.

  • ThisOldSalt

    Bernoulli's principle has far less to do with a sailboat's ability to move than newton's 3rd law, and is often the incorrect answer given to describe sailing and flying. If Bernoulli was an appropriate description of the physics of airfoils, it could explain inverted flight and downwind sailing. The familiar curved shape of an airfoil functions to reduce drag. It is the flatter underside of of the wing, an the windward "scoop" of the sail that produces lift.

    • digitalclips

      Actually you are incorrect. Both Newton's 3d Law and Bernoulli's principle are at play. If sailing with the wind then yes, Bernoulli's principle has little to do with things, however, if you are sailing at an angle then Bernoulli principle is describing the reason for the increase in pressure in the sail because of the reduced pressure over the leading, curved edge, this with the rudder creating an equal and opposite vector the resultant vector is forward. If you think of an airplane wing for a moment, there is no 'wind' pushing the plain up, it is the forward motion producing the lift due to Bernoulli' principle. The video is extremely well done and very clear on all these points.

  • Ormond Otvos

    Only spent two decades talking about sailboat physics with a NASA airfoil engineer, so I might still have this wrong, but he always finalized his explanation by emphasizing the change in momentum of the air particles induced by the foil. Worked really well for winning races by mentally integrating the foil underwater with the foils in the air. The video is exceptionally poor using streaming hydraulics in an incompressible fluid to explain the actions of a foil in a compressible gas. Redo this film, it's misleading.

  • Bob Noonan

    I enjoyed the program except for a distortion of the history of sailing. In the program it was suggested that old time sailing vessels were always square rigged and that sailing into the wind (tacking) is a modern innovation. Fore-and-aft rigging and the ability to sail into the wind are very old innovations in human history. Arabs used fore and aft rigging (lateen sails) on their dhows. Fore and aft rigging were common on smaller boats in European history as seen in old paintinngs. There are the three, four, five and six masted schooners that were common workhorses in coastal maritime trade in the late 19th and early 20th century.; The intensive scientific research is new, but the rig is not.