PitLab Autopilot User Manual page 5

Autopilot – User's manual
Vibration protection
Autopilot should be protected against vibration (which affects the
position sensors: accelerometers and gyroscopes). You can use the
dumpers, sponge, or some other own patents. Dampers should dampen
vibrations and resonances (do not use springs and rubber).
NOTE: The greater the mass of an isolated element, the vibrations are
more effectively limited, so it is best to mount flexibly the whole
"sandwich" OSD + autopilot, and not the autopilot board only.
The vibration level is checked with the engine running - if overload and
vibration exceed 2g a digit will appear on the screen showing the current
number of overload (2g, 3g, up to 8g).
Excessive vibration causes tilting ("passing out") of the artificial horizon
on the OSD, despite the fact that the model is still level. The sensors, and
algorithms of the autopilot should ensure the proper operation of up to
the overload of 5 g, but keep in mind that during the fly, there are
additional overloads (turbulence, the centrifugal force, etc.), and
generally the lower the vibration, the more accurate is the work of the
autopilot. You must therefore strive to achieve a minimum level of
vibration from the engine.
© Pit Lab 2017 https://www.pitlab.com/fpv-system/autopilot.html
Reverses and servos concurrency
Adjusting RC apparatus for controlling a particular model means to
correctly set reverses and mixers so that the control rods tilt correspond
to the appropriate control surface deflection. In the same way it is
necessary to adjust the autopilot to the specific model to ensure proper
control of autonomous flight model.
The first step is to select the type of model tail in OSD menu autopilot ->
Mixer
When one rod is attached to two servos and two control surfaces (delta,
tail V, flaperons), we can choose between two options of servos
concurrency, (in line) and (anti in line), depending on whether for the
proper control the opposite – or non-opposite movement of servos is
required.
In the second step, for each side of the rudder we set the correct channel
under OSD autopilot -> Mixers
Check the proper settings for servo and reverse concurrency after
stabilization mode is off, observing the behavior of the control surfaces
on bank and inclination of the model. When reverses and concurrency
are positioned properly, by tilting or pitching the model they must be set
in such a position that during the flight they counteract such deviation of
the model.
Page 5 of 21