Flight Training - November 2011 - 39

STABILITY PROFILES
Airplanes will exhibit stability characteristics in each of their three axes. These are expressed as a series of oscillations that can increase, stay the same, or decrease. Critically, stability can change based on location of center of gravity, bank angle, and other factors.

STATIC STABILITY (IMMEDIATE REACTION)
Positive Upon an upset, the airplane will have an immediate tendency to return to the normal condition.

DYNAMIC STABILITY (REACTION OVER TIME)
Positive After upset, the amplitude of oscillations decreases over time with each subsequent wave. Eventually the airplane returns to its originally trimmed condition. Neutral Oscillations stay consistent, getting no larger or smaller.

Neutral The airplane will maintain the new trajectory.

Negative The airplane will diverge from the current trajectory, and away from a normal condition.

Negative The most unstable of conditions, oscillations continue to increase, eventually resulting in loss of controlled flight.

"BEFORE THE GAS TURBINE AGE, MUCH OF THE ART OF STABILITY AND CONTROL DESIGN WAS DEVOTED TO MAKING AIRPLANES THAT FLEW THEMSELVES FOR MINUTES AT A TIME IN CALM AIR, AND RESPONDED GRACEFULLY TO THE HANDS AND FEET OF THE PILOT."
—Airplane Stability and Control: A History of the Technologies That Made Aviation Possible

PROPER LOADING

Center of gravity is a primary factor in an airplane’s longitudinal stability. When properly loaded, an airplane’s center of lift is usually behind its center of gravity. Combined with a downforce on the tail, this makes for a stable condition. But if loaded too far aft or too far forward, an airplane’s longitudinal stability can be greatly compromised.

NOVEMBER 2011 FLIGHT TRAINING

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IN AVIATION, NOTHING IS FREE, AND THAT'S CERTAINLY TRUE OF AIRCRAFT CONTROL.



Flight Training - November 2011

Table of Contents for the Digital Edition of Flight Training - November 2011

Flight Training - November 2011
Contents
President’s Perspective
Right Seat
Letters
Know Where to Go
This Weekend
Success Stories
AOPA Action Member Products
News
ASI News Tech Tip
Since You Asked
How It Works
News
Final Exam
Checkride
Flying Carpet
Follow the River
When the Plan Goes Out the Window
Technique
Weather
Flight Lesson
Time for a Change?
Career Advisor
Tech Talk
Teaching the T&G
Add an Hour
The CFI Bookshelf
Advertiser Index
Debrief
Flight Training - November 2011 - Flight Training - November 2011
Flight Training - November 2011 - Cover2
Flight Training - November 2011 - Contents
Flight Training - November 2011 - 2
Flight Training - November 2011 - 3
Flight Training - November 2011 - President’s Perspective
Flight Training - November 2011 - 5
Flight Training - November 2011 - Right Seat
Flight Training - November 2011 - 7
Flight Training - November 2011 - Letters
Flight Training - November 2011 - 9
Flight Training - November 2011 - Know Where to Go
Flight Training - November 2011 - 11
Flight Training - November 2011 - This Weekend
Flight Training - November 2011 - Success Stories
Flight Training - November 2011 - AOPA Action Member Products
Flight Training - November 2011 - News
Flight Training - November 2011 - ASI News Tech Tip
Flight Training - November 2011 - 17
Flight Training - November 2011 - Since You Asked
Flight Training - November 2011 - 19
Flight Training - November 2011 - How It Works
Flight Training - November 2011 - News
Flight Training - November 2011 - 22
Flight Training - November 2011 - 23
Flight Training - November 2011 - Final Exam
Flight Training - November 2011 - Checkride
Flight Training - November 2011 - Flying Carpet
Flight Training - November 2011 - 27
Flight Training - November 2011 - Follow the River
Flight Training - November 2011 - 29
Flight Training - November 2011 - 30
Flight Training - November 2011 - 31
Flight Training - November 2011 - 32
Flight Training - November 2011 - 33
Flight Training - November 2011 - When the Plan Goes Out the Window
Flight Training - November 2011 - 35
Flight Training - November 2011 - 36
Flight Training - November 2011 - 37
Flight Training - November 2011 - Technique
Flight Training - November 2011 - 39
Flight Training - November 2011 - Weather
Flight Training - November 2011 - 41
Flight Training - November 2011 - 42
Flight Training - November 2011 - Flight Lesson
Flight Training - November 2011 - 44
Flight Training - November 2011 - Time for a Change?
Flight Training - November 2011 - Career Advisor
Flight Training - November 2011 - 47
Flight Training - November 2011 - Tech Talk
Flight Training - November 2011 - Teaching the T&G
Flight Training - November 2011 - Add an Hour
Flight Training - November 2011 - The CFI Bookshelf
Flight Training - November 2011 - Advertiser Index
Flight Training - November 2011 - 53
Flight Training - November 2011 - 54
Flight Training - November 2011 - 55
Flight Training - November 2011 - Debrief
Flight Training - November 2011 - Cover3
Flight Training - November 2011 - Cover4
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