It is most important popular question that most of people want to know that how an aircraft fly. In this presentation, there are some significant points which focus on an aircraft remains keeps in the air.

1. Presented By: Lindsay green
How Does an Aircraft
Fly?

2. •Introduction
•Aerodynamics
•Air Flow
•Flying Without Engines
•Wing Components
•Flaps
•Ailerons
•Speed Brakes
Table of Content

3. Introduction
• Aircraft consist largely of a cylindrical fuselage
with wings attached.
• A machine that is able to fly by gaining support
from the air.
•The human activity that surrounds aircraft is
called aviation.

4. Aerodynamics
• Name for the interplay of forces that drive an
object through the air.
•If we look at a cross section of an aircraft wing,
we can see that the upper
edge is rounder on the
lower edge.

5. Aerodynamics(contt..)
•The speed of the air around the upper edge is
greater than that of the air travelling below the
wing.
•It states that, the faster a gas (in this case, air)
travels, the lower the pressure it exerts.
•The pressure against the wing’s upper edge is
considerably lower than the pressure against the
lower edge.

6. Air Flow
• We are actually hanging on the air ,
• Because the pressure against the upper edge of
the wing is lower than that against the lower edge.
• However, the wing does have to be passing
through the air.
• There must be air flow around the wing in order
for the pressure differential to arise.

7. Air Flow(contt..)
• we need engines to create propulsion.
• They cause the wings to pass through the
surrounding air.
• It creates a balance in which we can see two
forces horizontally.

8. Flying Without Engines
• Even if the engines stopped working—which hap
pens very rarely—aircraft are still capable of glidin
g great distances.
• On every flight, as we make our approach for lan
ding, we reduce the engine’s propulsion.
• We don’t turn the engine off completely, but they
turn because of the air passing through them. So t
hey are not creating any propulsion.

9. Wing Components
• The wing is designed to provide optimum lift at n
ormal speed, which we call cruising speed.
• For a jet, that’s about 850 kilo metres per hour.
• Of course we can’t take off or land at that speed.
• We would need a much longer runway to do that.

10. Flaps
• Flaps are long panels on the trailing edge of the
wing that we can extend bit-by-bit.
• Some aircraft also have flaps on the wings’
leading edge—sometimes called slats.
• After takeoff, as the aircraft increases speed, we
retract the flaps.

11. Ailerons
• By varying the wing’s curvature, we cause one
wing to give it more lift than the other.
•For instance, when we make a left turn, we push
the right aileron down which gives it greater curva
ture and more lift, thereby pushing the left wing d
own.

12. Speed Brakes
• Finally, the wings have long panels along the up
per edge. We call these speed brakes.
• It’s not a true brake. Rather, it “disrupts” the air
around the wing.
• It reduces lift and allows us to descend more qui
ckly, if necessary.

13. Thank You