Captron HeliCommand 3A 3D RIGID Instructions Manual page 29

Internal-combustion helicopters: vibration test
Severe vibration or body resonance can cause serious problems with the
correct operation of the sensor; three checks are therefore necessary:
1) Feel weather the case of the HeliCommand unit is vibrating.
2) Before take-off, switch to "yellow" mode and observe whether the
swashplate stays level at all rotational speeds.
3) Take off initially in "OFF" mode, then switch stabilisation only briefly on and
off again, as a first try for safety's sake. If applicable, repeat this at different
motor speeds.
If problems occur, please refer to the installation notes on page 16.
Gain setting
Start the test-flying schedule with a reduced gain setting for tail gyro and
stabilisation and best to set up via the supplied channels! Depending on the
type of helicopter and installed height of the unit, 100% or even only 65%
may be allowed in Hor- and Pos-mode. Using higher gain, severe oscillatory
movements may occur. This applies in particular when the distance between
the sensor and the ground is very small (< 0.5 m).
Set the gain so that optimum stabilisation is achieved in the "green" Pos mode at
an altitude of about 0.5 m. If oscillation occurs → reduce. If drifting uncontrolled
→ increase. With tail rotor gyros it is usual practice to set the gain hard up against
the limit of oscillation, but this is not necessary with the Pilot channel of the
HeliCommand. "Softer" settings look better in flight, as the model's flight path is
affected less directly by the HeliCommand's spontaneous control actions.
If your helicopter is extremely unresponsive or extremely agile, you may
find it necessary to optimise the stabilising effect by making use of the
supplementary settings which are available via the PC adaptor.
During high-speed flight the HeliCommand only brakes the model slowly by itself.
This means: if you override the HeliCommand by giving powerful control com-
mands (see page 34), you will have to control the helicopter actively. Please note
that a variable "forward freewheel" option can be set using the PC adaptor.
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