Testing the mounting and reversing of an Aileron Gyro. (start off with
a fully flight tested airplane)
1) Connect the gyro 3 wire servo connector to the Aileron
Channel of your Rx
2) Connect the aileron servo to the gyro (If you have dual aileron
servos, you will have to use a Y splitter).
3) Connect the gyro gain wire (if it has one) to a spare channel on the
Tx that uses a switch.
Turn on the Tx and then the Rx. Be careful not to move the gyro until
it initializes (refer to your gyro manual to determine what indicates
full initialization). Most gyros will blip the servo output or have an
LED indicator that shows it is initialized. Some gyros like the Futaba
GY401 will allow you to use your spare channel switch to re-initialize
5) If the Ailerons slowly drift to full difflection then you are
in HH mode, flip the spare channel switch to put it into Rate mode.
6) Set the wing so that the front of the wing is facing the front of
Quickly Rotate the airplane to the left and hold it there(right bank).
The right aileron should lift up then center itself again immediatly
with a second. If it lifts up and stays there, you are in HH mode so
flip the spare channel switch to put it into Rate mode. If it drops,
then you need to reverse the gyro.Reversing the gyro is not done by
reversing the Aileron Channel in the Tx. It is also not done by
reversing the spare channel either. Gyro reversing is done by flipping
a switch on the gyro (if it has one) or by rotating the gyro 180
degrees. In the case of the Aileron gyro, the part of the gyro that was
facing the nose should be rotated to face the tail WITHOUT changing the
direction of the face of the gyro that was pointing up. If you need to
reverse it, do so then turn off the Rx power and perform steps 4-7
Setting the gyro gain.
1) The spare channel should be
used to set the gyro gain. I recommend 30% for the initial
flight. Use the Travel Adjust (ATV) setting in the Tx to adjust the
gain. (Did I mention you want to have a computer radio?). 30% ATV
setting = 30% gain (not exactly but this is how I will reference it on
my tutorial). I recommend setting the gain to the same value for each
direction of the spare channel switch. This way, if you accidently have
the servo in heading hold mode, you are less likely to get wing wag.
You will notice that with a lower gain setting, when you rotate the
airplane, the ailerons will difflect less. With a higher gain, the
ailerons will difflect MORE with the same impulse of rotation.
Final Mounting of the gyro.
that you have the orientation correct, go ahead and mount the gyro
(semi-perminant). Use 2 layers of the foam tape. You may wish to use
tie wraps to hold the gyro in place, If you do use tye wraps, DO NOT
tighten the tie wraps all the way down. The gyro must remain isolated
from vibration and not clamped down by the tie wraps. These gyros are
very light and are unlikely to vibrate off the gyro tape unless they
are rubbing on something else but periodic inspection is a good idea.
you may want to strain relief the aileron servo wire so that it does
not pull out of the gyro connection when using a gyro that the servo
plugs directy into the gyro (Esky 704A/B, Telebee etc).