STABILITY AND CONTROL

1
STABILITY AND CONTROL
STABILITY and CONTROL
BY
And Johnny
2
Stability and control enables the flight of all
aircraft
3
AN OUTLINE OF THE BASIC EQUATION YOU NEED TO
LEARN YOU WILL NEED TO DO FURTHER RESEARCH
YOURSELF!!!!
When an aircraft pitches up these rules apply
ONLY JOKING
4
(lateral axis)
(Normal axis)
(Longitudinal axis)

• The axes always act through the centre of
  gravity

5
STABILITY
Definition (stability) the ease of which a
person is able to be stabbed
6
STABILITY
Without the stability of a well-deigned aircraft
the pilot would have to make continual small
adjustments when flying due to slight bumps
(turbulence) in the air. To understand stability
clearly we need to consider stability in each of
the planes.
7
Stability in the Pitching plane (Longitudinal
Stability)
Down wash on tail plain acts around the centre of
gravity making the aircraft pitch up.
When the aircraft returns to normal air the tail
plane has normal lift and so returns to normal
straight and level flight.
8
Stability in the Rolling Plane (Lateral
Stability)
Dihedral wings
9
Stability in the Yawing plane (Directional
Stability)
After an air disturbance has caused an aircraft
to yaw unintentionally it will then correct
itself towards the oncoming air.
10
TOO MUCH STABILITY IS A BAD THING
It is tiring for the pilot to constantly overcome
stabilising forces to change direction So the
designer has to find a balance between too much
and too little stability
11
CONTROLS
12
Movement and controls
Ailerons control movement in the rolling plane
about its longitudinal axis
13
Ailerons
Ailerons alter the amount of lift that a wing
produces, enabling the aircraft to turn or roll.
Aileron in neutral normal lift
Aileron lowered increased lift
Aileron raised decreased lift
14
Rolling moving the control column left or
right to adjust ailerons
In this case the control column has been moved to
the right causing the aircraft to spin in a
clock-wise direction
Decreased lift
Increased lift
15
Pitch pulling or pushing the control column to
pitch up and down
In this case the control column has been pulled
towards the pilot
16
Flap positions
Flaps -- Located on the inner part of the wing,
the Flaps help the plane fly slower. This helps
to increase the lifting force of the wing at
slower speeds, like during takeoff and landing.
These slower speeds make takeoff and landing
distances shorter. The Flaps slide back and
forth, and are controlled by a lever in the
cockpit. Flaps are moved down from a streamlined
position to increase the amount of lift produced
at a particular airspeed.
17
FLAPS AND TRIM TABS
18
Trimming enables to pilot to fly straight and
level without applying any pressure to the
control column, it is done by moving a wheel in
the cockpit
19
NOW
FOR
THE
TEST
20
No Cheating
21

• What are the 3 planes of an aircrafts movement?
• Pitching, lateral and rolling.
• Pitching, rolling and yawing.
• Yawing longitudinal and rolling.
• Longitudinal, lateral and normal

1.b) 2.d) 3.b)

• 2. What are the three axes about which an
  aircraft can move?
• Pitching, lateral and longitudinal.
• Pitching, rolling and yawing.
• Yawing, longitudinal and normal.
• Longitudinal, lateral and normal.

• 3. Which surfaces control an aircraft in the
  rolling plane.
• Elevators.
• Ailerons.
• Rudder.
• Tabs.

22
1/3-Youre a failure
2/3 Im dissapointed
3/3 Amazing
0/3 oh dear
23
ME
YOU
I have fuelled you with my vast tank of knowledge