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Upturned wingtips cause the plane to use fuel more efficiently.

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Q: Why are the wing tips on modern passenger jets upturned?
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Price per kilo of scrap carbide tips please?

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Who made more money the man who invented the shoe lace or the man who invented shoe lace tips?

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Why do some aircraft have condensation trails and some do not?

Contrails are created under certain atmospheric conditions and depends on the pressures and water vapor. They are created from wing tips or propeller tips and engine exhausts. Each airplane varies in their design of these features. Many modern airplanes have wings designed with supercritcal airfoils that produce more lift---and therefore developes a lower air pressure. Some jet fighters also have special designed wings and wing tips that will create contrails in a tight turn that earlier aircraft could not perform. Thus the F-18 can fly very low and still produce contrails. There are many factors that contribute to the contrails so there is no way to predict which aircraft will produce one.


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Prior to the arrival of Europeans on the North American continent, the natives were fashioning their spear tips and arrow tips out of flint, which is a type of stone.When Europeans began arriving upon the North American continent, the natives were entranced by the methods by which the Europeans were fashioning their swords, spear tips and arrowheads out of steel.When the fashionistas are fashioningmilitaristic-style clothing, you could say they are Fascist.


Why are the wings of some planes bent up at the tips?

These are called winglets. They reduce drag therefore increase lift.

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