________ required even more drastic changes in airfoil shapes, some losing the roundness formerly associated with a wing and having a double- wedge shape.
2
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Weight
________ is a force that acts opposite to lift.
3
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Lift
________ and thrust are artificially created elements devised to enable an aircraft to fly.
4
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18th century
In the ________ the Swiss mathematician Daniel Bernoulli discovered that, if the velocity of air is increased over a certain point of an airfoil, the pressure of the air is decreased.
5
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thermal techniques
In a sailplane, height attained by mechanical, orographic, or ________ is translated into speed by means of gravity.
6
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jet engine
In a(n) ________, thrust derives from the propulsive force of the rotating blades of a turbine compressing air, which is then expanded by the combustion of introduced fuel and exhausted from the engine.
7
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total lift
Thus, ________ is related to the shape of the airfoil, the angle of attack, and the speed with which the wing passes through the air.
8
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upper surface
Early airfoils typically had little more than a slightly curved ________ and a flat undersurface.
9
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Thrust
________ is obtained by accelerating a mass of ambient air to a velocity greater than the speed of the aircraft; the equal and opposite reaction is for the aircraft to move forward.