The Flying Connection <BGSOUND SRC="Fire.mid" LOOP=INFINITE>

The Four Forces of an Aircraft
   The basic knowledge of what a pilot must understand are the four forces of an aircraft. The four
forces are-

* Thrust

* Lift

* Weight

* Drag

     Before an aircraft takes off, it have to gain some speed on the runway before it is airborne. In
order to achieve this, the aircraft must have good and efficient engines in order to produce thrust,
so the aircraft could accelerate and take off. Without thrust,  the aircraft will not fly.

       Lift is produced by the wings of the aircraft as it accelerates on the runway. Lift is produced
due to the curved shape on the surface of the wing.
This is how the wing of an aircraft produce lift-
The wing of an aircraft is also known as the aerofoil. It have a curved shape in order to produce
lift. As the aircraft accelerate before taking off, air moves on the surfaces of the wings. Low
pressure air travels on the top of the aerofoil because the air on the top moves faster compared to
the air in the lower part of the wing (The Bernoulli's Law states that the faster a gas travels, the
lower the air pressure). The high air pressure in the lower part of the wing pushes the wing
upwards and therefore, lift is produced.  

        Stalling occurs when the wings of the aircraft receives insufficient flow of air due to
decreased speed and thrust of aircraft.

       As an aircraft flies in the air, weight or gravitional force acts on it . If the aircraft have less
thrust, the aircraft would decrease its altitude due to gravitional force.

         Drag decreases the speed of an aircraft. There are two factors that could produce drag. The
first factor is when strong air current moves in the opposite direction of the aircraft thus, slowing
it down. The second factor is the structure of the aircraft (eg, Rough surface of aircraft) that slows
it down.

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