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Aircraft Stability Basics

The document discusses aircraft stability and control. It defines concepts like degree of freedom, stability, static stability, and dynamic stability. It explains that stability is an aircraft's ability to return to its original state after a disturbance without pilot input. The document also discusses different types of stability like longitudinal, lateral, and directional stability. It describes aircraft controls like ailerons, elevators, and rudders which control roll, pitch, and yaw movements respectively. The goal of aircraft design is to achieve stability and provide proper control response.

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64 views16 pages

Aircraft Stability Basics

The document discusses aircraft stability and control. It defines concepts like degree of freedom, stability, static stability, and dynamic stability. It explains that stability is an aircraft's ability to return to its original state after a disturbance without pilot input. The document also discusses different types of stability like longitudinal, lateral, and directional stability. It describes aircraft controls like ailerons, elevators, and rudders which control roll, pitch, and yaw movements respectively. The goal of aircraft design is to achieve stability and provide proper control response.

Uploaded by

Sumendran vicky
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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www.Vidyarthiplus.

com

AIRCRAFT STABILITY
AND
CONTROL

BY
Y.K.SINHA

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www.Vidyarthiplus.com

DEGREE OF FREEDOM
• The degree of freedom of a system is the
number of independent parameters require
to describe the state of the system from one
instant to another
• Example
– Train 1 degree of freedom
– Car 3 degree of freedom
– Airplane
• Stick free 6 degree of freedom
• Stick fixed 9 degree of freedom
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www.Vidyarthiplus.com

WHAT IS STABILITY?
The stability of an airplane means its ability
to return to some particular condition o flight
with out any effect on the part of the pilot.
Stability is a desirable criteria and not
essential criteria. It releases the stress on
the pilot by taking care of small disturbance
during flight.
Less stable aircraft is easy to control than
more stable aircraft

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www.Vidyarthiplus.com

STABILITY
• STATIC STABILITY

• DYNAMIC STABILITY

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STATIC STABILITY

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DYNAMIC STABILITY

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STABILITY
• STATIC STABILITY
– LONGITUDINAL STICK FIXED

– LATERAL STICK FREE

– DIRECTIONAL
• DYNAMIC STABILITY
– LONGITUDINAL STICK FIXED

– LATERAL STICK FREE

– DIRECTIONAL
Note
Stick fixed : It is the condition in which the primary control
surface are held in their neutral position
Stick free : It is the condition in which the pilot releases the
control surface and allows it to take its own position
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WHAT IS CONTROLS?

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CONTROL REQUIREMENTS
• The response to a given control action should always be
in the same sense, whatever the condition of flight
• The aircraft should be sensitive to control displacements,
but not too sensitive
• The magnitude of the control force require to displace a
control should increase steadily with the control
displacement, and so also should the magnitude of the
aircraft’s response
• The response of the aircraft to operation of the controls
should be rapid i.e. there should be any considerable time
lag

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www.Vidyarthiplus.com

AILERON
LONGITUDINAL AXIS EXTENDS LENGTHWISE FROM THE NOSE
THROUGH THE TAIL. MOVEMENT ABOUT THE LONGITUDINAL AXIS
IS CALLED ROLL. ROLL IS CONTROLLED BY THE AILERONS.

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ELEVATOR
LATERAL AXIS EXTENDS CROSSWISE FROM WINGTIP
THROUGH WINGTIP. MOVEMENT ABOUT THE LATERAL AXIS IS
CALLED PITCH. PITCH IS CONTROLLED BY THE ELEVATOR.

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www.Vidyarthiplus.com

RUDDER
VERTICAL AXIS PASSES VERTICALLY THROUGH THE CENTER
OF GRAVITY (WHEN THE AIRCRAFT IS IN LEVEL FLIGHT).
MOVEMENT ABOUT THE VERTICAL AXIS IS CALLED YAW.
YAW IS CONTROLLED BY THE RUDDER.

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www.Vidyarthiplus.com

That’s all folks!!!

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