It is interesting to note that with the formerly presumed force causing effect that produces lift on wings or sails, the Bernoulli Principle, it is the speed change that causes the pressure differential that makes the force, while with the force that really does produce lift on sails and wings, it is the pressure differential that makes the force that causes the speed change.
The former was sort of putting the cart before the horse apparently. I think when the B. Princ. was dismissed as the cause of lift, many then thought the pressure differentials associated with it also were fictitious, but they are not. Specifically, it is the negative pressure on top of a wing or sail the deflects the air downward in the case of a wing and to windward in the case of a sail. The vacuum or suction causes the deflection and that makes the force known as lift. The more the boat goes upwind the more the force that drives the boat comes from the lee side of the sail. -Ken _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [EMAIL PROTECTED] To unsubscribe send an email to [EMAIL PROTECTED] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
