UAV-1003946-001, AV-30-C
Pilot’s Guide
44
Revision D
Page
11 AoA Operation and Configuration
The following provides a description of how the derived Angle of Attack
(AoA) operates and presents the corresponding AoA information to the
pilot.
One of the main advantages of an AoA system is that it can provide an
early indication of a stall, bringing enhanced awareness to the pilot.
However, the AV-30-C system is supplemental in nature and
does not replace the functionality provided by the aircrafts
existing stall warning system.
11.1 Operational Methodology
Angle of attack is determined by comparing aircraft pitch to the aircraft
flight path angle through the air. In level flight this directly corresponds to
the angle at which the wing is intercepting the body of air surrounding the
aircraft, with correlates to the current AoA.
Pitch is determined by the precision internal AHRS and flight path angle is
determined by air-data based airspeed versus vertical speed
measurements.
Angle Of Attack
Pitch Angle
Flight Path
Level Ref
Pitch Angle = AHRS Measured Pitch
Flight Path Angle = ADC Vertical Speed / Indicated Airspeed
Figure 33
– AoA Computation
As an example of this relationship, during a climb, if the pitch angle is 10
degrees upward, and the aircrafts flight path through the air (forward
