HOME MAIN GYRO PAGE Elevon Gyros. This tutorial will go over the installation of 2 gyros
(Label Up style) onto an Elevon controlled airplane. This method will
NOT use an external V-tail Mixer but will require V-tail mixing in your
Transmitter. The method of using 2 gyros will stabilize both pitch and
Roll of the plane. Because a single elevon will affect both the pitch
and roll of the plane, the gyro will need to be installed at an offset
angle. In my example I am showing a Gy48V from HobbyPartz.
These are Piezo sensor gyros that are inexpensive, built well and have
a nice flat surface to mount on each side of it's cube type enclosure.
Both gyro's gain wires will be connected through a splitter to a
single channel to adjust the gain. I will show you how to set the gain
switch for OFF(low rate gain) and ON (Rate gain) which is how I
recommend you set it up for initial flying.
You should install the gyros onto a plane that has been test flown and
trimmed out FIRST before installing the gyros.
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
further. PLEASE refer to RCGROUPS or RCUNIVERSE or just google "ELEVON
SETUP <insert your radio>" to figure out how to setup Elevon
mixing. It is typicall that swapping the aileron/elevator channel
and/or servo reversing is needed to get this done. Once again FLY THE PLANE w/o the gyro installed first to validate your setup.
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.
Follow the drawing below for Gyro connections. You will need a
servo Y splitter to connect up the gain. Note that the label of
the gyro faces FORWARD AND RIGHT for the Right servo's gyro and FORWARD
and LEFT for the LEFT servo's gyro. (This is valid for a LABEL UP style
gyro like the GY48V)
Power the TX on first, then the RX. Let the airplane stabilize for
about 10 seconds before moving. With all the connections shown
above, you should be able to flip your gain channel and both GYRO LEDs
should go on and off (both should be on at the same time or off at the
same time). With LED off, this is RATE mode. With LED on, this is
Heading Hold (HH) mode. Flip switch so that LED is off (Rate mode) At this time, travel adjust for Gear Channel should be 100% on each direction. 4) Pitch the plane up/down. When you pitch the plane's TAIL down, BOTH Elevons should move down. When you pitch the plane's TAIL
up, the elevons should both move UP. If either elevon does not do this,
change the reverse switch on the cooresponding gyro. 5) Roll the plane left (lift the right wing up). The right Elevon should move UP and the left should move DOWN. 6) Move your aileron stick right, Right elevon should move up and left elevon should move down 7) Move your elevator stick back (towards you). Both Elevons should move up. 8)
If after performing STEP 4 above, Step 5,6,7 is not correct, then you
are going to have to play with servo reversing, gyro reversing and
possibly swapping the Aileron/Elevator channels. YOU MUST be able
to pass the test in steps 4-7 before flying.
Adjusting Gain in Tx 9)
Rember how one gear switch setting turned the LED on? Well set the
switch to where the LED is on. That's Heading Hold mode, we don't want
to fly in that mode. Now, adjust the Travel adjust for Gear channel all
the way to zero. (One or both LEDs on the gyro may turn off at this
point). 10) If either of the Gyro LEDs are lit, then adjust the Gear
subtrim until both Gyro LEDs are off. Go about 2-3 clicks beyond
the point where the gyro LED turns off. This is now your gyro OFF
switch position. 11) Verify now that moving the airplane does NOT
move the elevons. Also verify that moving the sticks still yield
the correct elevon movement. 12) Flip the gyro switch in the other
direction. Now adjust the travel adjust for the gear channel to
about 30%. This will be our initial setting for flying.
Adjusting Travel Adjust 12)
With gyro switch in RATE mode, adjust the travel range of the Elevator
movement per the instructions of the manual for your airplane.
You will NOT use the Tx for this, the TX should be set to 100%
travel adjust already for aileron and elevator. Pull full back
then turn the LIMIT dial on both gyros to get the desired elevator
movement. 13) Since the gyro's limit dial affects both
aileron and elevator movement, you can now test aileron movement.
If you think there is too much, you can turn down the aileron
dual rates or travel adjust in the TX. note that, you may not see the
movement in the elevons, but when the airplane is in the air, the roll
rate will be reduced whenever you have the travel adjust/dual rates for
either the elevator or aileron set below 100%.
Initial test flight and adjustments Now
for the moment of truth. Before EACH flight, make sure you power up the
plane AFTER the TX. Also to let the gyro sit for 10 seconds before
moveing it. Do a control surface test. Then move the airplane and
verify the elevons are moving corretly (steps 4-5 above). Do your
first flight at 30% gain. If the plane wobbles/oscillates at any
time (especially in a high speed dive) then turn down the gain.
You can also adjust the angle of the gyros to compensate for
oscillation in one direction or the other. For example if it's
oscillating in the roll axis but you want more pitch stability, instead
of turning down the gain, angle the label of both gyros more towards
the sides. If it's oscillating in the pitch axis but you want more roll
stability, then angle the label of both gyros more forward. Move about
5 degrees each time you try as a recommendation.
Video of Flying Dog House with 2 gyros on an Elevon setup. This
was my first venture into elevon gyros in 2011. Before adding the
gyros, this plane was a real pain to fly and even worse to land.
I really lost aileron controllability on landings and almost
always flipped it over. With the gyro, only my nose wheel became my
issue. Flying it was like it was a totally new plane.