About Alpha Systems AOA
Angle of attack (AOA) identification is nothing new, in 1907 Wilbur Wright identified that an accurate, positive and repeatable method of climb out could be identified by a vane attached to a protractor, indicating a safe 
and repeatable way to fly. Having a pusher aircraft type, a simple
(a protractor and string) way of measuring the Angle of Attack was high technology for the time. In the early 1940’s, that simple technology carried over into the initial vane type of AOA measurement however, the vanes needed to be in undisturbed air, outside propeller, or other structural airframe members that would cause erroneous vane movements and inconsistencies over all AOA in-flight angles.
As technology progressed, in the early 1970’s The US Air Force commissioned a study to look at alternative ways to accurately measure and give real time AOA information by the means of a simple AOA probe that measures differential pressure without the use of a movable vane.
This AOA probe attached on the aircraft in a location that could measure repeated changes of differential pressure over the entire range of the aircrafts’ flight dynamics, from Cruise up to Stall, and give the pilot a calibrated readout of AOA specifically calibrated for the wings lift and flight dynamics.
Training pilots in general aviation utilizing airspeeds to determine safe flight is only part of the picture. Instructors reference AOA (Angle of Attack) in ground schools, some try to show attitude flying to reference AOA when in flight. AOA is an absolute direct indication of available lift, or lack of the wing to maintain directional control for any aircraft.
Taking information learned from the military and commercial industries, in the early 1980s’ Morgan Huntington placed a differential pressure probe on an aircraft ,connected a gauge, and the first General Aviation, differential pressure AOA system was born.
Alpha Systems AOA currently manufactures 6 versions of electronic digital LED displays. The “Classic” AOA’s, 16 LED @ 4” long X 1” wide vertical, 4” long X 1” wide horizontal, and a 2 ¼” round LED. The “ULTRA” AOA’s, 16 mini LED @ 2.5” long X .750” wide with mounting in both vertical and horizontal versions. And the newest electronic system, the “LEGACY” AOA, a chevron styled, LED driven display. All electronic kits come complete with an Air Data Computer, complete installation and calibration manuals, reference data, hoses, probe, probe mounting plate and all hardware. The LED displays face plate has a taupe back ground color.