HOME MAIN GYRO PAGE
Aileron Gyro. Installation
of a gyro on the aileron axis can provide a high degree of
stabilization to wind. Wind mainly moves in the horizontal
This affects the airplane often by lifting one wing up and
causing instability in the attitude and heading of the airplane.
Often this is realized in crashes during landing and take
The time where most crashes occur. On this page I will go
the basic step by step the installation of a gyro on the aileron axis
of an airplane.
You should install the gyro onto a plane that has been test flown and
trimmed out FIRST before installing the gyro. You should MECHANICALLY
adjust the trims on your airplane using linkages or repositioning the
servo arms to be centered. Remove all Subtrim and trim from
airplane and keep mechanically trimming the airplane before moving
GYRO INSTALLATION 1) Choose and purchase a gyro.
I recommend the Detrum GY48V gyro from Hobbypartz.
This gyro is easy to mount because it is square with flat sides. It
also requires no modifications because the gyro is held well inside the
case and the cables are strain relieved.
2) Mount the gyro on or inside the plane with the label facing forwards
or rearwards (Assuming you have a Label
UP gyro like the GY48V. If you don't then follow the
following drawings: Label UP, Label Sideways.
Based on the table in the LINKS PAGE.
When mounting, you should mount it in a way that isolates it from
vibrations. In most electric planes, simply mounting it into the
fuselage near the wing is fine. For Nitro planes, you may
use several layers of gyro tape. In general, I recommend
indoor/outdoor foam tape. It is Gray with red release film
sticks great over time when you apply with pressure. If you
a foam surface, epoxy a metal or plywood plate to the foam to secure
the gyro. DO NOT VELCRO the gyro to the airplane.
3) All gyros
will have a male and female servo wire. Plug one end to the Aileron
channel of the Rx and the other to your aileron servo. If you have 2
servos, use a Y harness to connect the 2 aileron servos.
gyros will then have a gain wire plug. To tell the difference, most
will have only 1 wire on them or a different color connector. In any
case, the gyro instruction manual will mention this. Connect this to
your Gear Channel or Flaps Channel (gear channel will be explained
5) Initially set the Travel adjust (endpoint adjust or ATV)
for the Gear channel to 100/100.
6) Power up the plane but once you power it up, DO NOT MOVE THE PLANE
until the gyro has initialized.
Set the gyro to RATE mode using your gear switch (most gyros with a
gear gain wire will indicate the RATE MODE by turning the LED off, such
is the GY48V).You know your switch is set to rate mode because the
control surface will always return to center after you move the stick.
If it does not return to center after moving the stick then releasing,
then it is in heading hold mode.
8) Verify your gyro reverse setting
is correct. Lift the right wing quickly and the right aileron should
lift as well. If not, flip the REVerse setting on the gyro. If the gyro
has no reverse switch, it will have to be flipped around (face label in
opposite direction while maintaining the same direction of the wires). Here is a
page on testing the gyro reversing.
Your transmitter Aileron channel should not have to be reversed because
you flight tested the airplane before installing the gyro right? :)
If your gyro has a gain setting allowing you to control the
rate/heading hold mode gain, set the Rate mode gain to 30% for your
initial flight. Do this by keeping the Gear switch to Rate mode, then
decreasing the Travel adjust (endpoint/ATV) to 30.
10) You can
either set your Heading Hold position gain to 30% or set the Heading
hold position to Rate Mode/Zero Gain which will basically set the gyro
off. To do so, set the Heading Hold switch position Endpoint
0. Now, adjust the sub trim of the gear channel until the
(indicating Heading Hold) just goes out. 2 more clicks in the same
direction you went to turn it off and now your done. Notice how in the
OFF position, moving the wing does not affect the ailerons.
again, I recommend you do your initial test flights with the Gyro in
RATE mode and about a 30% gain. This should allow for some stability
with a very low chance of oscillation. If you do get some
oscillation, you will simply slow the plane down and land.
Oscillations with a gyro on an airplane typically get WORSE the
faster you fly so look for them in a high speed dive.
GET READY TO FLY When
at your maiden, remember to not disturb the plane after you power it
up. Then do a control surface test as well as gyro test
flight. Move the sticks to check the ailerons. Then
the wing and verify the control surface goes up. When you fly it, do a
high speed dive starting from a safe altitude. If the ailerons wiggle
at any time, turn the gain down. If you feel you want more
stability, turn the gain up.
following is a video showing the installation of a LABEL UP (Detrum
GY48V) gyro installed into the Ailerons of an Airfoils Depron Profile
foamie. This gyro is in RATE MODE and has a gain wire.
following is a video showing the installation of a LABEL UP (Esky
installation onto the Ailerons of a Hawksky. NOTE: This gyro is RATE
MODE only and has no gain wire.