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Text 3. Flaps
In landing flaps play a very important role. If the flap is well down the increase in drag will be considerable and the gliding angle will be greater. So we can see that the flaps permit slower and safer flight, lower landing speeds, steeper angles of descent. The flaps permit landing on short fields. We may classify flaps according to their mechanical nature into plain flaps, split flaps, Fowler flaps and slotted flaps. In the plain flap the trailing edge is deflected downward. In the split flap the shape of the upper surface of the wing is unchanged when the flap is lowered. The split flap creates more drag than the plain flap The Fowler flap moves backward on a track. The slotted flap provides a slot or opening between the wing and the leading edge of the flap.
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