Gourt > Recreation > Models > Boats and Ships > Static > Sail
A sail is any type of surface intended to generate thrust by being placed in a wind — in essence a vertically-oriented wing. Sails are used in sailing.
Sail aerodynamics
Sails propel the boat in one of two ways. When the boat is going in the direction of the wind (i.e. downwind - see Points of sail), the sails merely act to catch the air as it flows by. This method of propulsion is simple enough that it really doesn't need any additional explanation — the wind simply blows the boat downwind and the sails act more like a parachute than like a wing.
The other way sails propel the boat occurs when the boat is travelling across the wind or into the wind. In this situation, the sails propel the boat by redirecting the wind coming in from the side towards the rear. In accordance with the law of conservation of momentum, air is redirected backwards, making the boat go forward. This driving force is called lift.
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Anybody 13 ,and like norfolk southern?
NS SD70M-2 Mon, 03 Sep 2007 20:42:04 -0000
Title says it all.
how do you get them un-interested?
spookytown rr Wed, 16 Jan 2008 01:09:45 -0000
Ok so we have HO, O, and G , not to mention a lot of Thomas/Brio, so what does he want for christmas - N scale Amtrak - with sidings and extra track of course!Pick a scale we already have dang it!
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molsongoldon Fri, 15 Aug 2008 15:31:08 -0000
Does anyone know of or take part in a train presentation to Cub scout packs? I am a leader of my local scout pack and want to invite my local club, etc to a meeting. I am worried that the parents will then hate me for introducing the "addiction" to the pack. Anyone part of a club in t he Newtown, CT. area that would like to come visit? t-meggs
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