Mr. Daniel Bernoulli was an 18th century Swiss scientist that discovered
that as the velocity of a fluid increases, it's pressure decreases. How and
why it works and what it has to do with aircraft in flight is forthcoming.
Bernoulli's Principle can most easily be seen through a Venturi tube. This
tube is like cylinder that is narrow in the middle. When fluid passes
through the tube and reaches the narrow part it speeds up. Now normally when
you think that molecules speed up that it would increase pressure too, but it
doesn't. The pressure decreases. As fluid passes over the middle of the
tube, more energy gets used and the molecules accelerate. This leaves less
energy to exert the pressure and the pressure then decreases. Some describe
this as Pressure Differential. Pressure at point A is less than that at
point B, sometimes called Bernoulli's Law of Pressure Differential.
Bernoulli's Principle applies to any fluid and since air is a fluid, it
works there too. The camber of an air foil, a wing as it were, causes an
increase in the velocity of the air passing over it. As the air reaches the
other side of the air foil, there is a decrease in the pressure of the stream
moving over the air foil. This decrease in pressure causes lift.
An easier example to demonstrate this is be riding in a car with the
windows down. Extend your hand flat out straight out the window. Tilt your
hand up ward and the air stream passing will cause your hand to rise. This is
lift. Now if you tilt it downward it brings your hand back down rather fast.
This is drag, or simply put the idea working in reverse. The same principle
also applies in steering an aircraft so that it can go left or right with the
use of it's rudder. Flaps control you vertically, and the rudder controls you
laterally. There you go, Bernoulli's Principle.
SrCmdr. Mike Burke
Outpost # 39
1st A/G
Triangle VA
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