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Basic Laws Of
Aerodynamics
Or
Aerodynamics for Dummies
Newton’s Laws of Motion
•Law of Inertia
•Law of Acceleration
•Law of Action and Reaction
Law of Inertia
Newton’s First Law:
This law states that a body at rest will
remain at rest, and a body in motion
will remain in motion until acted upon
by an outside force.
Practical example of the Law of Inertia
•Rotor system prior to start (remains at rest)
•Engine overcomes resistance to movement
(outside force)
•Rotor continues to spin after shutdown
(remains in motion)
•Rotor slows due to air resistance
(Drag or outside force)
Law of Acceleration
Newton’s Second Law:
The force required to produce a
change in the motion of a body is
directly proportional to its mass and
the rate of change in its velocity.
Acceleration is a change in velocity
with respect to time. It can be either
an increase or decrease in velocity
Acceleration = Force over Mass
The force required to move an A-Star
across the ramp to some speed is
greater than the force required to
move an R-22
OR
If we applied the same force used to
move the A-Star on the R-22, the R-22
would move faster, or accelerate.
Law of Action and Reaction
Newton’s Third Law:
For every action, there is an equal and
opposite reaction
If an interaction occurs between two
bodies, equal forces in opposite directions
will be imparted to each body
Torque Effect is an example of
“Action - Reaction”
or
Another example is
The Recoil from a Gun…
Question
Why does the projectile move and
the barrel remain in place?
Answer:
Because the barrel has more mass
Questions?
Go home
ball!