Avionics News June 2022 - 38

series
B Y
T H O M A S
I N M A N
Autopilot Basics
Part II
T
his month we present the
second of a four-part series
describing the basic theory
of autopilot technology. Last month, we
examined the processes of a single-axis
autopilot. This month, we examine the
second axis. An autopilot controlling
the pitch axis will never be certified as
a stand-alone system. A pitch axis can
be added to a single (roll) axis autopilot,
or the pitch axis system will be part of a
two-axis autoflight system.
The principles used in the pitch axis
are similar to those of the roll axis. The
typical airplane is much more stable in
the pitch axis. This stability translates
into a larger effort required to change the
attitude of the aircraft, nose up or nose
down. In most general aviation autopilots
with electric servos, the motors are small
and won't have the torque required to
overcome aerodynamic resistance. As a
result, the vast majority of pitch systems
must use a subsystem to operate trim.
References
To sense aircraft attitude, the system
can use an attitude gyro, inertial reference
system, an attitude heading reference
38 avionics news * june 2022
...V
Reference
...V
Computer Amplifier
Servo
5V
28V
Computer Amplifier
Reference
Servo
FIGURE 1: The reference produces an error voltage, which is amplified to operate a servo motor.

Avionics News June 2022

Table of Contents for the Digital Edition of Avionics News June 2022

Avionics News June 2022 - Intro
Avionics News June 2022 - Cover1
Avionics News June 2022 - Cover2
Avionics News June 2022 - 1
Avionics News June 2022 - 2
Avionics News June 2022 - 3
Avionics News June 2022 - 4
Avionics News June 2022 - 5
Avionics News June 2022 - 6
Avionics News June 2022 - 7
Avionics News June 2022 - 8
Avionics News June 2022 - 9
Avionics News June 2022 - 10
Avionics News June 2022 - 11
Avionics News June 2022 - 12
Avionics News June 2022 - 13
Avionics News June 2022 - 14
Avionics News June 2022 - 15
Avionics News June 2022 - 16
Avionics News June 2022 - 17
Avionics News June 2022 - 18
Avionics News June 2022 - 19
Avionics News June 2022 - 20
Avionics News June 2022 - 21
Avionics News June 2022 - 22
Avionics News June 2022 - 23
Avionics News June 2022 - 24
Avionics News June 2022 - 25
Avionics News June 2022 - 26
Avionics News June 2022 - 27
Avionics News June 2022 - 28
Avionics News June 2022 - 29
Avionics News June 2022 - 30
Avionics News June 2022 - 31
Avionics News June 2022 - 32
Avionics News June 2022 - 33
Avionics News June 2022 - 34
Avionics News June 2022 - 35
Avionics News June 2022 - 36
Avionics News June 2022 - 37
Avionics News June 2022 - 38
Avionics News June 2022 - 39
Avionics News June 2022 - 40
Avionics News June 2022 - 41
Avionics News June 2022 - 42
Avionics News June 2022 - 43
Avionics News June 2022 - 44
Avionics News June 2022 - 45
Avionics News June 2022 - 46
Avionics News June 2022 - 47
Avionics News June 2022 - 48
Avionics News June 2022 - 49
Avionics News June 2022 - 50
Avionics News June 2022 - 51
Avionics News June 2022 - 52
Avionics News June 2022 - 53
Avionics News June 2022 - 54
Avionics News June 2022 - 55
Avionics News June 2022 - 56
Avionics News June 2022 - 57
Avionics News June 2022 - 58
Avionics News June 2022 - 59
Avionics News June 2022 - 60
Avionics News June 2022 - 61
Avionics News June 2022 - 62
Avionics News June 2022 - 63
Avionics News June 2022 - 64
Avionics News June 2022 - 65
Avionics News June 2022 - 66
Avionics News June 2022 - 67
Avionics News June 2022 - 68
Avionics News June 2022 - 69
Avionics News June 2022 - 70
Avionics News June 2022 - 71
Avionics News June 2022 - 72
Avionics News June 2022 - Cover3
Avionics News June 2022 - Cover4
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