Asked Questions (FAQs)
What is AlphaTrainer?
The AlphaTrainer instructional devices are useful tools that explain angle
of attack and how to properly approach stalls and spins. More importantly,
AlphaTrainer illustrates how to avoid these inherently dangerous situations.
AlphaTrainer stresses the importance of understanding that what the pilot
perceives is not always perfectly correlated to Angle of Attack.
From newcomers to Airline Transport Pilots, all pilots can learn from
the AlphaTrainer instructional devices. Most import, however, is that flight
instructors can use AlphaTrainer to teach AOA, and also use it to test
the student’s AOA comprehension.
can’t pilots make a distinction between attitude and angle of attack?
Usually, familiarity with actual pilot’s view tricks the mind’s
eye for changes in angle of attack. In most light airplanes, the airplane
will pivot—on its center of gravity—up to15 degrees to compensate
for changes in speed, atmosphere, and weight caused by “G”
loading. This pivot is AOA. AlphaTrainer is instrumental in developing
a concept where the Pilot’s Perceived Attitude is more aligned with
the Instantaneous Flight Path than with the attitude of the airplane.
For example, visualize that you’re in level flight and want to reduce
your airspeed from cruise speed to minimum controllable speed. During
cruise speed, let’s say an AOA of 4 degrees, the attitude of the
airplane and the Pilot’s Perceived Attitude are essentially level.
As the airplane slows to generate an AOA of 12 degrees, the attitude of
the airplane will adjust up 8 more degrees. To maintain altitude, the
airplane must be held in this nose-up attitude, therefore changing the
attitude of the pilot’s body. However, the pilot’s eyes continually
adjust to follow the horizon reference. Perhaps a simpler way is to visualize
rocking in a rocking chair while continuing to stare at a picture mounted
on a wall. As the body moves upward, the eyes will tend to move downward
to remain fixed on the picture.
an angle of attack indicator help in recovering from the stall scenarios
you have discussed?
Absolutely. We must understand that stall recovery requires the maximum
lifting capacity of the stalled wing, especially when at a low altitude.
This is the key purpose of angle of attack indicators; they register how
much the wing is capable of lifting without stalling.
Why are most
light airplanes not equipped with an angle of attack indicator?
Simple. The FAA does not require them. Nevertheless, I believe the fundamental
problem with non-use of AOA indicators is the Law of Primacy; wherein
something learned first leaves an almost unshakable impression. Most of
us aviators have learned stalls by using some mark on an airspeed indicator.
Then after we accepted that, we were told that a stall could occur at
any airspeed, in any attitude, and with any power setting. How much safer
would our pilots be today if all of us would have started with an AOA
indicator and learned the phase: From Red to Green is our Dream?
Jim Frantz of Proprietary Software Systems, Inc. (www.angle-of-attack.com) expands: “Early aircraft were equipped with simple AOA indicators, including
the Wright brothers’ aircraft. However, when the tractor driven
(propeller in front) aircraft became popular, it turned into a problem
of where to put the AOA sensor. The sensor needed to clear the prop wash
and still be far enough ahead of the wing to avoid configuration errors.
This problem has largely been solved by new technology that eliminates
the need for vane based sensors.”
Do the airlines and the smaller jets have angle of attack indicators?
Yes, most high performance airplanes have some form of angle of attack
indicator, because stall recognition is difficult. The U.S. Navy uses
angle of attack almost exclusively for landing on carriers. A friend—and
former Naval instructor—frequently states, “I would rather
lose my airspeed indicator any day over my angle of attack indicator.”
Are there inexpensive angle of attack indicators for small airplanes?
Yes. We at AlphaTrainer recognize the importance of such devices. Please
research different medium, including the Internet, and encourage the manufactures
to advertise the benefits of these devices.
Why no FAQs for
AlphaTrainer 3D User's Guide, it includes FAQs for the 3D Simulator.
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