Flight Training - September 2012 - 24
you sometimes need to trim the nose down when you first extend the flaps. But, even when increasing lift—as a result of increasing wing area—flaps also increase drag. As a general rule of thumb, however, as long as flap deployment is limited to less than half of the total flap extension that is available, the increase in lift will be greater than the corresponding increase in drag. It is this property that allows us to use flaps so effectively on takeoff. As previously mentioned, flaps increase drag. Once you extend flaps past the halfway point (roughly), drag increases far more than does lift. This is why you can
use your flaps to increase lift enough to allow you to fly at a slower speed near the pattern, yet use even more flaps to fly even more slowly while descending at a steeper angle on final. When the flaps are fully extended, you may need to re-trim—while adding power. Some aircraft have flaps that truly live up to the moniker of a barn door. When Cessna was building the venerable 150 with 40 degrees of flaps, pilots had an airplane that, in a stiff headwind, could almost imitate a helicopter in its landing performance. The same holds true with jets. The Boeing 737 can land with
40 degrees of flaps, but it almost never does. For most landings it is not necessary, and using the full-flap setting creates a tremendous amount of noise because of the thrust requirement and aerodynamic noise created by the airflow over the wings. But, when it is necessary, the crew does have the flap-40 option. Speaking of jets, the majority of jet aircraft not only have flaps on the rear of the wing, but also slats on the front of the wing. In the GA world, just about every aircraft has a straight wing. Viewed from above or below, the airplane looks like a cross. Straight wings are structurally easy
FLAPS HAVE TWO PRIMARY functions. They increase both lift and drag. The increase in lift comes from a change in camber, or the shape of the wing. But since drag is a byproduct of lift, drag is increased as well.
24 /
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Flight Training - September 2012
Table of Contents for the Digital Edition of Flight Training - September 2012
Flight Training - September 2012
Contents
President’s Perspective
Right Seat
Letters
Flying Low and Slow
How It Works
Success Story AOPA Summit News
After the Checkride
ASI News Tech Tip
Since You Asked
Training Products News
Flying Carpet
Give Yourself a Lift
Radiohead
Everything I Know About Flying I Learned in the Traffic Pattern
Technique
Weather
Checkride
Flight Lesson
Drone Incoming
Career Advisor
Tech Talk
You Can Do It
The Landing 'Time Machine'
Advertiser Index
Debrief
Flight Training - September 2012 - Flight Training - September 2012
Flight Training - September 2012 - Cover2
Flight Training - September 2012 - Contents
Flight Training - September 2012 - 2
Flight Training - September 2012 - 3
Flight Training - September 2012 - President’s Perspective
Flight Training - September 2012 - 5
Flight Training - September 2012 - Right Seat
Flight Training - September 2012 - 7
Flight Training - September 2012 - Letters
Flight Training - September 2012 - 9
Flight Training - September 2012 - Flying Low and Slow
Flight Training - September 2012 - 11
Flight Training - September 2012 - How It Works
Flight Training - September 2012 - Success Story AOPA Summit News
Flight Training - September 2012 - After the Checkride
Flight Training - September 2012 - ASI News Tech Tip
Flight Training - September 2012 - Since You Asked
Flight Training - September 2012 - 17
Flight Training - September 2012 - Training Products News
Flight Training - September 2012 - 19
Flight Training - September 2012 - Flying Carpet
Flight Training - September 2012 - 21
Flight Training - September 2012 - Give Yourself a Lift
Flight Training - September 2012 - 23
Flight Training - September 2012 - 24
Flight Training - September 2012 - 25
Flight Training - September 2012 - 26
Flight Training - September 2012 - 27
Flight Training - September 2012 - Radiohead
Flight Training - September 2012 - 29
Flight Training - September 2012 - 30
Flight Training - September 2012 - 31
Flight Training - September 2012 - Everything I Know About Flying I Learned in the Traffic Pattern
Flight Training - September 2012 - 33
Flight Training - September 2012 - 34
Flight Training - September 2012 - 35
Flight Training - September 2012 - Technique
Flight Training - September 2012 - 37
Flight Training - September 2012 - Weather
Flight Training - September 2012 - 39
Flight Training - September 2012 - 40
Flight Training - September 2012 - Checkride
Flight Training - September 2012 - 42
Flight Training - September 2012 - 43
Flight Training - September 2012 - Flight Lesson
Flight Training - September 2012 - Drone Incoming
Flight Training - September 2012 - Career Advisor
Flight Training - September 2012 - 47
Flight Training - September 2012 - Tech Talk
Flight Training - September 2012 - You Can Do It
Flight Training - September 2012 - The Landing 'Time Machine'
Flight Training - September 2012 - 51
Flight Training - September 2012 - Advertiser Index
Flight Training - September 2012 - 53
Flight Training - September 2012 - 54
Flight Training - September 2012 - 55
Flight Training - September 2012 - Debrief
Flight Training - September 2012 - Cover3
Flight Training - September 2012 - Cover4
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