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Paragliding aerofoils.
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What invention allowed ships to sail into the wind?
Wut made ships sail in the wind was that using a persicet sail or flag will pick up the wind and will push the air out and sail..just like u swinging on a swing 
What causes ocean swells?
Surface gravity waves not created by wind
Why were caravels able to sail?
The wind blowing the sails is what made the caravels (ships) sail. It balances with the pressure of the wind blowing onto the sail to push the ship across the ocean. Kinda like when you drag your dog if he/she doesn't want to walk. You dragging the dog is like you're the wind, the dog's the ship, and the leash to drag the dog with is the sail. You get it? :D?
What do boats generally sail on?
Water like the sea or lakes, but the sails sail on the wind and air. Hope this is the answer you were looking for!
Is it better to sail with squared sails when the wind is opposite you?
You cannot sail with the wind opposite you. If the wind is following you, that is, directly astern, then you sail 'gull winged'.
How does a boat sail against the wind?
To sail against the wind, a boat has to 'tack'. This means that instead of sailing straight into the wind (which would get you nowhere) you sail in a zig-zag in the direction you intend to go. On each tack, the wind is on a different side of the sail.
Did the invention of triangular lateen sails make it possible for ships to sail more easily into the wind?
Allegedly, the lateen sail design made it possible to sail closer into the wind. That is, less than 45 degrees from the direction the wind is blowing. No sail boat can sail directly into the wind. Yet.
Device that helps ships sail into the wind?
No sailing ship can sail directly into the wind. However by rigging the sails correctly the vessel can be made to sail more closely to the wind.
What is a three sided sail?
A three sided sail is known as a Lateen sail or also a triangular sail. With a four sided sail one is only able to sail against the wind, but with a Lateen sail it is possible to sail more directly into the wind.
How does a boat sail into the wind?
A boat can sail into the wind by sailing backwards and forwards (tacking) at an angle to the wind and so making her way up.
How Does a Boat Sail Upwind?
A sailing boat can not sail directly upwind, sail at about 45 degrees to the wind and tack (turn the boat through the wind) to the other side of the wind and continue in this zig-zag manner up wind.
In what places do you use wind?
We use wind in places like windmills, for wave energy, at sea: pushing the sail of a boat, etc.
