How Does an Aircraft Fly? - PowerPoint PPT Presentation

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How Does an Aircraft Fly?

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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. – PowerPoint PPT presentation

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Title: How Does an Aircraft Fly?


1
How Does an Aircraft Fly?
Presented By Lindsay green
2
Table of Content
  • Introduction
  • Aerodynamics
  • Air Flow
  • Flying Without Engines
  • Wing Components
  • Flaps
  • Ailerons
  • Speed Brakes

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 wings 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 workingwhich
    happens very rarelyaircraft are still capable of
    gliding great distances.
  • On every flight, as we make our approach for
    landing, we reduce the engines propulsion.
  • We dont turn the engine off completely, but
    they turn because of the air passing through
    them. So they are not creating any propulsion.

9
Wing Components
  • The wing is designed to provide optimum lift at
    normal speed, which we call cruising speed.
  • For a jet, thats about 850 kilo metres per
    hour.
  • Of course we cant 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 edgesometimes called slats.
  • After takeoff, as the aircraft increases speed,
    we retract the flaps.

11
Ailerons
  • By varying the wings 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
    curvature and more lift, thereby pushing the left
    wing down.

12
Speed Brakes
  • Finally, the wings have long panels along the
    upper edge. We call these speed brakes.
  • Its not a true brake. Rather, it disrupts the
    air around the wing.
  • It reduces lift and allows us to descend more
    quickly, if necessary.

13
Thank You
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