Flight Training - June 2014 - 13
HOW IT WORKS
BY IAN J. TWOMBLY
Stall strips
Airflow disrupters
AIRPLANES MUST HAVE gentle, predictable stall characteristics for the sake of
both safety and certification. So what
happens when flight testing reveals that
the airplane has a bad temper with stalls?
One technique is to add stall strips.
In an ideal stall situation, airflow
separates first at the wing root and gradu-
ally moves out as the stall deepens. This
gives the pilot some aileron authority in
the stall, which can be useful if a wing
drops or if the aircraft is in a turn. Stall
strips help this process. By affixing small
triangular strips to the front of the wing
near the wing root, the engineer is able
to create an area where airflow separates
at a lower angle of attack than the rest of
the wing. Placing them near the root can
ensure that it stalls first.
In rarer cases, a stall strip can be added
only to one wing if the airplane is prone
to drop one wing more than the other in
a stall. By hastening the stall, the airplane
becomes more docile and predictable.
STEVE KARP
OTHER STALL DEVICES
STALL FENCE. Vertical piece on top of the wing (or wrapped around the front) that prevents air from moving out along the span during a stall.
VORTEX GENERATOR. Small metal tabs along the top and near the front of the wing that energize the boundary layer and delay the onset of a stall.
SLOTS. A long hole that runs parallel with the front of the wing. They route air at high angles of attack, delaying the onset of a stall.
CUFFS. A different section of wing leading edge that has a lower angle of attack, allowing it to produce lift while the other section has stalled.
JUNE 2014 FLIGHT TRAINING
/ 13
Flight Training - June 2014
Table of Contents for the Digital Edition of Flight Training - June 2014
Flight Training - June 2014
Contents
Member Benefits
Right Seat
Letters
Future Flight
Success Stories News
How it Works
Training Products ASI 'Storm Week'
News
Final Exam
News
ASI News
News
Flight Lession
Accident Report
Around the Patch
Flying Carpet
Cover Story: Park It!
Good Pilots Don't Juggle
Help, My Instructor Is Leaving
Technique
Weather
Career Pilot
Instructor Report
Accident Analysis
Checkride Prep
Career Advisor
Advertiser Index
Debrief
Flight Training - June 2014 - Flight Training - June 2014
Flight Training - June 2014 - Cover2
Flight Training - June 2014 - Contents
Flight Training - June 2014 - 2
Flight Training - June 2014 - 3
Flight Training - June 2014 - Member Benefits
Flight Training - June 2014 - 5
Flight Training - June 2014 - Right Seat
Flight Training - June 2014 - 7
Flight Training - June 2014 - Letters
Flight Training - June 2014 - 9
Flight Training - June 2014 - Future Flight
Flight Training - June 2014 - 11
Flight Training - June 2014 - Success Stories News
Flight Training - June 2014 - How it Works
Flight Training - June 2014 - Training Products ASI 'Storm Week'
Flight Training - June 2014 - News
Flight Training - June 2014 - Final Exam
Flight Training - June 2014 - News
Flight Training - June 2014 - ASI News
Flight Training - June 2014 - News
Flight Training - June 2014 - Flight Lession
Flight Training - June 2014 - 21
Flight Training - June 2014 - Accident Report
Flight Training - June 2014 - 23
Flight Training - June 2014 - Around the Patch
Flight Training - June 2014 - 25
Flight Training - June 2014 - Flying Carpet
Flight Training - June 2014 - 27
Flight Training - June 2014 - Cover Story: Park It!
Flight Training - June 2014 - 29
Flight Training - June 2014 - 30
Flight Training - June 2014 - 31
Flight Training - June 2014 - 32
Flight Training - June 2014 - 33
Flight Training - June 2014 - Good Pilots Don't Juggle
Flight Training - June 2014 - 35
Flight Training - June 2014 - 36
Flight Training - June 2014 - 37
Flight Training - June 2014 - Help, My Instructor Is Leaving
Flight Training - June 2014 - 39
Flight Training - June 2014 - 40
Flight Training - June 2014 - 41
Flight Training - June 2014 - Technique
Flight Training - June 2014 - 43
Flight Training - June 2014 - Weather
Flight Training - June 2014 - 45
Flight Training - June 2014 - 46
Flight Training - June 2014 - Career Pilot
Flight Training - June 2014 - 48
Flight Training - June 2014 - Instructor Report
Flight Training - June 2014 - Accident Analysis
Flight Training - June 2014 - Checkride Prep
Flight Training - June 2014 - Career Advisor
Flight Training - June 2014 - Advertiser Index
Flight Training - June 2014 - 54
Flight Training - June 2014 - 55
Flight Training - June 2014 - Debrief
Flight Training - June 2014 - Cover3
Flight Training - June 2014 - Cover4
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