First some basics
So there are 3 axis, A full autopilot will control
-Axis Autopilot - this phrase is often misused in
talking about autopilot capabilities.
Some use it to mean “roll,
heading hold and altitude
Since the first two functions are both roll
axis functions and altitude hold is a pitch
function, most autopilots are infact 2 axis systems.
GPS computer processes information into right and
left steering commands. These are then sent to the autopilot that
flies the airplane in response to these commands.
Most autopilots typically track a course using heading data and
Axis Autopilot, with Roll Axis Computer~US$
This type of autopilot is Also called WING LEVELER.
You are now flying on autopilot with the gyro keeping your wings
It's steering your ailerons. (roll-axis)roll,
Navaid can deliver the best value for money autopilot, assembled,
tested, and delivered in U.S. or Canada: For $1,300.00 US ;-))
Axis Autopilots - Roll and Pitch ~US$ 5,836.00
Additional to the above feature, there is altitude
You can search and find in the RC corner an autopilot
it will still cost $5000,-
This isn't the right place to look, you must have some confidence
in the parts. (I don't)
GPSS Roll Steering
left/right commands and fly multiple waypoint courses and steering
maneuvers defined by waypoints automatically.
You need a GPS navigator that outputs composite roll
steering commands through the 429 Buss
This needs time, In a year there will be cheaper avionics outputting
( Just wait, or pay $$$)
the Standard NMEA 0183 sentences which can control an Autopilot.
The sentences output are $GPRMC,
The sentences are output each time a sentence is received from the
- Recommended minimum navigation info
- Recommended minimum specific GPS/Transit data
- Autopilot Sentence "B"
APB -This sentence is commonly used by autopilots
and contains navigation receiver warning flag status, cross-track-error,
waypoint arrival status, initial bearing from origin waypoint to
the destination, continuous bearing from present position to destination
and recommended heading-to-steer to destination waypoint
for the active navigation leg of the journey
You need a pushing or pulling a distance of 1.5 to
Then find a place to mount the servo nearby to accomplish this by
means of the push rod.
The servo box is not very small LxWxH 4.75"x3.25"x3"
Crank Arm, 1" radius 30lb and 1.25"