This veil is part of family aft sails. It still increases performance by reducing the entire surface of mast backwards, releasing the front portion thereof for the installation of jibs. The shape of a sail that dumps a lot at the horn, making it less effective but still allows large sails to carry a short mast (Key West sail and snorkel). Constraints have allowed only very recently to get closer without having to use many spars and running rigging, whose weight and windage often compensate for the gain provided. It was used since ancient times known way from the Baltic to Mediterranean on merchant and military vessels, whether sea or river.
That's why sailors always changing their settings to keep them as close as possible the separation sails without the to stall. This requires constant attention, because the setting must be adapted to changes in speed, heading, and wind changes. Strands of wool or ribbons (favors) are often set in various parts of hollow sails to materialize flow nets wind, and report the stall.
During the development sailing ships (seventeenth century-nineteenth century) the increase in ship size has greatly increased the height of masts, and it has increased the number of square sails on each mast (we had 7 floors up) so that they remain cargables (foldable) with an acceptable number sailors. On the long downwind, captains clippers were sometimes added to outside extensions yards to wear veils called studding that allowed to win a little bit of speed. This delicate and risky operation was feared because of topmen the fall was the promise of certain death by drowning, the vessel being unable to turn around to come and look.
The force exerted by wind on sails is roughly perpendicular to chord of sails plan. The component of force which is parallel to axis of vessel is the propulsive force. The other component, perpendicular to axis of vessel tends to cause it to drift, but can also cause property (band) (the ship leans on its side), and can dangerously compromise its balance or capsize.
When the ship goes back to wind, the wind flow along the veil creates a pressure difference between the windward side (underside) and leeward (suction). In fact, depression is formed on the upper surface, which "pulls" the ship, allowing it to go upwind. This same phenomenon applied to an airplane wing, which allows him to fly.
At its inception this veil was little different from the square sails, his yard is horizontal, but with significantly improved performance upwind, including "topping lift" of yard, that is to say, the yard becomes more vertical in approaching the axis of mast.
This sails had its heyday In river navigation: easy to implement, it was adapted to folding or removable masts various vessels such as barges, barges, and some barges. Among the boats that brought this rig to perfection, we have the Thames barges which some copies still sailing today at the marina, while others lie dormant in a museum.
To avoid when the wind increases, it moves the center of gravity towards the rear, moving crew, use of ballast, for example, depending on the size of boat. It also guides the back and center of buoyancy sailing (or tilt mast rake). Depending on the time and place, the shape of sails vary significantly. The theoretical shape with the best performance in attached flow is a half vertical ellipse whose base touches the surface of water.
That's why sailors always changing their settings to keep them as close as possible the separation sails without the to stall. This requires constant attention, because the setting must be adapted to changes in speed, heading, and wind changes. Strands of wool or ribbons (favors) are often set in various parts of hollow sails to materialize flow nets wind, and report the stall.
During the development sailing ships (seventeenth century-nineteenth century) the increase in ship size has greatly increased the height of masts, and it has increased the number of square sails on each mast (we had 7 floors up) so that they remain cargables (foldable) with an acceptable number sailors. On the long downwind, captains clippers were sometimes added to outside extensions yards to wear veils called studding that allowed to win a little bit of speed. This delicate and risky operation was feared because of topmen the fall was the promise of certain death by drowning, the vessel being unable to turn around to come and look.
The force exerted by wind on sails is roughly perpendicular to chord of sails plan. The component of force which is parallel to axis of vessel is the propulsive force. The other component, perpendicular to axis of vessel tends to cause it to drift, but can also cause property (band) (the ship leans on its side), and can dangerously compromise its balance or capsize.
When the ship goes back to wind, the wind flow along the veil creates a pressure difference between the windward side (underside) and leeward (suction). In fact, depression is formed on the upper surface, which "pulls" the ship, allowing it to go upwind. This same phenomenon applied to an airplane wing, which allows him to fly.
At its inception this veil was little different from the square sails, his yard is horizontal, but with significantly improved performance upwind, including "topping lift" of yard, that is to say, the yard becomes more vertical in approaching the axis of mast.
This sails had its heyday In river navigation: easy to implement, it was adapted to folding or removable masts various vessels such as barges, barges, and some barges. Among the boats that brought this rig to perfection, we have the Thames barges which some copies still sailing today at the marina, while others lie dormant in a museum.
To avoid when the wind increases, it moves the center of gravity towards the rear, moving crew, use of ballast, for example, depending on the size of boat. It also guides the back and center of buoyancy sailing (or tilt mast rake). Depending on the time and place, the shape of sails vary significantly. The theoretical shape with the best performance in attached flow is a half vertical ellipse whose base touches the surface of water.
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