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## Aerodynamics

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### Glue fin on. Colour the wing. Colure the tail. Cut out wing. Glue front of wing ... The vertical fin and horizontal tail plane keep it stable.to control the air ... – PowerPoint PPT presentation

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Title: Aerodynamics

1
LESSON 2
Aerodynamics
2
• Week 2
• Glue fin on
• Colour the wing
• Colure the tail
• Cut out wing
• Glue front of wing
• Glue tail on
• Glue wing on

3
Aerodynamics is the study of how air flows
around objects.
How Dose A Wings Lift the Plane?
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5
Aerodynamics What a Drag!
When an object produces poor airflow, more
energy is required to push it forward.
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Forces of Flight
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SHOW TELL
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LESSON NOTES
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AIRCRAFT Most aircrafts that fly through the sky
have wings to keep them aloft. As the wing cut
swiftly through the air, they develop a strong
upward force called lift. This force supports
the weight of the aircraft, holding it up in the
air. Wings generate more lift when moving quickly
through the air AEROFOIL A wing is an aerofoil,
which means it has a special shape that enables
it to fly. The topside is curved and the
underside is almost flat- so making the topside
longer than the underside. As the wing cuts
through the air, it deflects the air. Due to the
wings shape, the air flowing above the wing moves
faster then the air flow below. Because air
pressure drops more as air moves faster, the air
below the wing has a greater pressure, pushing up
the wing. Control An aircraft also needs a tail
in order to fly. The vertical fin and horizontal
tail plane keep it stable.to control the air
craft height and course, the pilot operates the
following ailerons on the wings, and a rudder
and elevators on the tail
Aerodynamics What a Drag! Aerodynamics engineers
study the way in which air flows around objects.
One objective of aerodynamic studies is the
design of shapes that offer the least resistance
to the flow of air. Air offers a resistance to
any object moving through it. Air resistance is
influenced by the shape of an object.
If a moving object is streamlined, the air will
flow around it smoothly and cause less drag,
11
The Gift of Lift As long as weight is greater
than lift, you're grounded. But if you can create
lift greater than your aircraft's weight, you're
ready for takeoff. Simple enough, but easier said
than done. Unlike weight (which, thanks to
gravity, is always exerting itself), lift isn't
exactly self-motivating. We have to create it
ourselves. Generally, we do this by forcing air
around an "airfoil," like a wing.
Thrust or Bust Thrust is a mechanical force that
propels objects forward. Aircraft create thrust
in different ways. We can't be sure how your
chosen craft will work, but Newton's third law of
motion ("to every action there is an equal and
opposite reaction") will no doubt be key. By
propelling gases, such as plain old air,
backward, an aircraft's engines generate the
thrust that pushes them forward. Jets and rockets
use explosive chemical reactions to blast gases
backward, and all that gas backwardness generates
equal and opposite forward thrusting.
Propeller-based aircraft, on the other hand, use
internal combustion engines to rapidly spin
blades that behave like rotating airfoils. The
faster a propeller spins, the faster it propels
air backward--and backward blowing leads to equal
forward thrusting.
What a Drag If weight is a downer, drag is a
stopper. Drag is the aerodynamic force that
opposes an aircraft's motion through the air. Air
is something and not nothing after all. And when
any two objects slide past each other, they
generate friction, which siphons off kinetic
energy (motion) and converts it into heat. The
more friction, the more energy the sliding
objects lose, and the more they slow down.
Major Tom to Pound Control When it comes to
flying, weight is actually the easiest force to
deal with, because its effects are relatively
constant and easy to measure. Every aircraft has
a mass. We measure gravity's pull on that mass as
weight, and, since gravity is basically constant
here on Earth, so is the aircraft's weight (at
least until it starts adding passengers, or
burning fuel). Getting an aircraft airborne is
basically a matter of generating enough lift to
overcome its weight. Of course, one way to help
do that is to lighten the load as much as
possible from the start. Hence all aircraft parts
are made to weigh the minimum while still safely
doing their jobs, and airplane designers try to
remove all unnecessary components from their
crafts. Keeping an aircraft "fit and trim" simply
makes the job of lifting it easier.
12
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