2
Before final fixing you will need to identify which way up it needs to be for it to operate in the
correct sense (as described below), however at this stage identify an appropriate location
and fix temporarily until the sense check has been done.
The location should be as rigid as possible (avoid the extreme front of the model unless the
chassis is very rigid).
Avoid locations exposed to extreme heat or vibration.
To prevent vibration being transferred to the gyro make sure that the location allows at least
3mm clearance between the gyro case and any part of the model. Once the correct
operating sense has been established mount the gyro on the supplied foam tape.
Remember to mount the gyro so that the gain adjustment pot will be accessible.
Centre the rudder trim and any sub trim on the rudder channel, make sure the servo arm is
at 90
°
to the tail linkage. Any trim that is needed to stop the model rotating in the hover
should be done initially by adjusting the length of the tail linkage, the radio trim should only
be used after this process has been carried out and
only for fine trim adjustments
.
If you plan to use any form of tail compensation (pitch or throttle to rudder mixing) it is
important to make sure that the model hovers at half stick in order for this to function
properly.
The exception to this is if you use one of your radio's free mixers to create your own mixing
that does not rely on the model hovering at exactly centre stick.
It is normally best to use a larger servo arm in the range of 14 to 18mm. The arm size
depends on the individual model and the correct size can only be found by testing.
If the gyro gain can be turned up to near the maximum available then this is an indication
that the mechanical set up of the model is not correct and either a bigger servo arm or
longer tail rotor blades need to be fitted.
If only very little gain (less than about 30%) can be used before the tail starts to hunt then
this could be caused by the use of too large a servo arm but as there are many other
conditions with the model that can cause this, these should be checked first. See the trouble
shooting section for further information on this.
Checking the gyro is working in the correct sense.
As with any gyro it is vital to ensure that it operates in the correct sense. Failure to do so
may cause an uncontrollable pirouette on take off and beginners who are in any doubt about
how to set the sense correctly should seek experienced help.
First establish that the sense of the transmitter control is correct (i.e. that the application of a
right rudder command causes a change in tail pitch that will rotate the model to the right)
Once this has been done, check that turning the helicopter to the left makes the gyro apply
a tail rotor command to the right.
Axis of
invert gyro
to reverse
operating sense
ICG
180
GYRO
GAIN
GAIN
GAIN
GAIN
CSM
MADE IN ENGLAND
rotation
ORIENTATION AND OPERATING SENSE
If the gyro needs it's sensing reversed simply mount the unit the other way up.
