Gliding Scholarship Exercise 4 EFFECTS OF CONTROLS 1 CFS Gliding Examiners © 2008.
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Transcript of Gliding Scholarship Exercise 4 EFFECTS OF CONTROLS 1 CFS Gliding Examiners © 2008.
![Page 1: Gliding Scholarship Exercise 4 EFFECTS OF CONTROLS 1 CFS Gliding Examiners © 2008.](https://reader034.fdocuments.in/reader034/viewer/2022051215/56649cb65503460f9497b024/html5/thumbnails/1.jpg)
Gliding Scholarship
Exercise 4
EFFECTS OF CONTROLS 1
CFS Gliding Examiners © 2008
![Page 2: Gliding Scholarship Exercise 4 EFFECTS OF CONTROLS 1 CFS Gliding Examiners © 2008.](https://reader034.fdocuments.in/reader034/viewer/2022051215/56649cb65503460f9497b024/html5/thumbnails/2.jpg)
Gliding Scholarship
To select the datum attitude using co-ordinated controls
AIM
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Gliding Scholarship
1. Lookout
2. Handing over and taking over control
3. Following through and relaxing
AIRMANSHIP
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Gliding Scholarship
1. Lookout
LOOKOUT
If you see an aircraft before your instructor does, use the Clock Code to tell him where it is…
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Gliding Scholarship
LOOKOUT
The Clock Code
Imagine you are at the centre of the dial and 12 o’clock is straight ahead
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“Aircraft left 11 o'clock high”
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“Aircraft right one o'clock level”
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TAKING OVER CONTROL
If your instructor wishes to give you control, he will say:
“You have control”
Put your hands and feet lightly on the controls and say:What do you do?
“I have control, sir”
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Gliding Scholarship
ING OVER CONTROL
If your instructor wishes to take over control, he will say:
“I have control”
Take your hands and feet off the controls and say:What do you do?
“You have control, sir”
TAKHAND
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FOLLOWING THROUGH
If your instructor wants you to follow through, he will say:
“Follow me through”
Put your hands and feet lightly on the controls and say:What do you do?
“Following through, sir”
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RELAXING
If your instructor wants you to relax, he will say:
“Relax”
Take your hands and feet off the controls and say:What do you do?
“Relaxed, sir”
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THE DATUM ATTITUDE
THE DATUM ATTITUDE
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Gliding Scholarship
THE DATUM ATTITUDE
Note distance below horizon
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Gliding Scholarship
THE DATUM ATTITUDE
Instrument panel is parallel to horizon
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THE DATUM ATTITUDE
Airspeed is stable
Here are some more attitudes you will see…
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THE BANKED ATTITUDE
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THE APPROACH ATTITUDETHE BANKED ATTITUDE
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STABILITYSTABILITY
The aircraft is stable and will maintain the attitude with no control input needed
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AIRCRAFT AXESAIRCRAFT AXES
Lateral axis
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AIRCRAFT AXES
Lateral axis
The aircraft PITCHES about the lateral axis
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AIRCRAFT AXES
Longitudinal axis
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Gliding Scholarship
Longitudinal axis
AIRCRAFT AXES
The aircraft ROLLS about the longitudinal axis
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AIRCRAFT AXES
Vertical axis
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AIRCRAFT AXES
Vertical axis
The aircraft YAWS about the vertical axis
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PRIMARY EFFECTS OF THE CONTROLS
PRIMARY EFFECTS OF THE CONTROLS
ELEVATORS
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ELEVATORSZ 610E
ELEVATORS
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Z 610E
…the elevators move down
ELEVATORS
When you move the control column forward…
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Z 610E
The aircraft starts to pitch nose down…
ELEVATORS
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…and continues to pitch until the control column is returned to the neutral position
ELEVATORS
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Likewise, if you move the control column back…
…the elevators move up……and the aircraft pitches
nose up until you return the control column to the neutral position
ELEVATORS
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PRIMARY EFFECTS OF THE CONTROLS
AILERONS
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AILERONS
AILERONS
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AILERONS
When you move the control column to the right…
…the left aileron moves down and the right aileron moves up
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AILERONS
The aircraft starts to roll to the right…
…and continues to roll until the control column is returned to the neutral position
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Gliding Scholarship
Likewise, if you move the control column to the left…
…the left aileron moves up and the right aileron moves down …
…and the aircraft rolls to the left until you return the control column to
the neutral position
AILERONS
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PRIMARY EFFECTS OF THE CONTROLS
RUDDER
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RUDDER
RUDDER
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Gliding Scholarship
RUDDERWhen you push the right rudder pedal forwards…
…the rudder moves to the right…
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Gliding Scholarship
RUDDER
…and the aircraft yaws to the right
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RUDDER
the slip ball moves left to indicate unbalanced flight
As the aircraft yaws right,
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Gliding Scholarship
RUDDER
push the left pedal forwards until the slip ball is central
To restore balanced flight,
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If the ball is outside the ‘goalposts’…
…push the appropriate pedal forwards (right pedal if the ball is out to the right)…
…until the ball is back in the centre
In balanced flight, note that the rudder pedals are not necessarily centred
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EFFECTS OF CONTROLS IN A
BANKED ATTITUDE
EFFECTS OF CONTROLS IN A BANKED ATTITUDE
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Gliding Scholarship
EFFECTS OF CONTROLS IN A BANKED ATTITUDE
An aircraft always manoeuvres about its axes…
Lateral axis
Vertical axis
If the aircraft is banked, so are its axes
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EFFECTS OF CONTROLS IN A BANKED ATTITUDE
So in a level attitude, this is pitch…
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EFFECTS OF CONTROLS IN A BANKED ATTITUDE
So in a level attitude, this is pitch… …and this is yaw
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EFFECTS OF CONTROLS IN A BANKED ATTITUDE
But in a banked attitude, this is pitch…
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EFFECTS OF CONTROLS IN A BANKED ATTITUDE
In a banked attitude, this is pitch… …and this is yaw
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PROPORTIONAL RESPONSE
PROPORTIONAL RESPONSE
The rate at which the aircraft responds depends on how much
you deflect the controls
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PROPORTIONAL RESPONSE
So if you deflect the ailerons a small amount…
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PROPORTIONAL RESPONSE
…the aircraft rolls slowly
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PROPORTIONAL RESPONSE
And if you deflect the ailerons a large amount…
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PROPORTIONAL RESPONSE
…the aircraft rolls quickly
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PROPORTIONAL RESPONSE
The same applies to the elevator and rudder:
Remember, the rate at which the aircraft responds depends on how much you deflect the controls, not on how quickly you deflect them
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EFFECT OF SPEED
EFFECT OF SPEED
The rate at which the aircraft responds also depends on the airspeed
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EFFECT OF SPEED
For the same control deflection:
At low speed, controls feel and
response is
At high speed, controls feel and
response is
sloppysluggis
hfirm
crisp
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ADVERSE YAW
ADVERSE YAW
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ADVERSE YAW
When you deflect the ailerons…
…lift on this wing increases…
…and lift on this wing reduces
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ADVERSE YAW
…causing the aircraft to roll
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ADVERSE YAW
However, more lift means more drag…
…so the aircraft also yaws
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ADVERSE YAW
…and can be prevented by applying rudder in the same direction as aileron
Because the aircraft yaws left when you want to roll right, it is called ADVERSE YAW…
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ADVERSE YAW
So whenever you want to roll, you must apply rudder at the same time as you apply the ailerons…
This is called CO-ORDINATED CONTROLS
…in the same direction…
…and by just the right amount to prevent adverse yaw
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SELECTING THE DATUM ATTITUDE
SELECTING THE DATUM ATTITUDE
To select the datum attitude…
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To select the datum attitude…
SELECTING THE DATUM ATTITUDE
…first roll wings level using co-ordinated controls
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To select the datum attitude…
SELECTING THE DATUM ATTITUDE
…first roll wings level using co-ordinated controlsthen pitch to the datum attitude using elevator
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THE END?Any Questions
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Crown Copyright 2008
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The views expressed in this presentation do not necessarily reflect the views or policy of the MOD.
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