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ELVN (Elevon Mix)
ELVN (Elevon mix)
CH1
CH2
Aileron Operation
Elevator Operation
Front view
If you are setting up a tail-less delta or flying wing aircraft, you
can use this program to activate the pre-programmed elevon
mix that mixes the output on the CH 1 aileron and CH 2 elevator
servo channels. (As you will notice in the servo connection
chart, you plug one aileron servo in the receiver's channel 1 slot
and the other aileron servo into channel 2-the slot that usually
feeds the elevator.) This is necessary because on these wing
types the ailerons must double as elevators.
Note: When you activate ELVN, note that flaperon and V-tail
mixing are rendered unavailable by the radio.
Setting up elevons
1) Activate the elevon function by pressing both DATA buttons
when you are in the ELVN screen. Now check your model to
FLPN (Flaperon)
FLPN (Flaperon)
Optic 6 Sport - Page 24
see what happens when you move the right-hand joystick
side-to-side-the ailerons should go up and down appropriately.
Move the joystick forward and back to see if the ailerons both
respond correctly as elevators. If necessary, go to the S REV
screen to reverse an offending servo.
IMPORTANT NOTE: It is possible due to the particular
configuration of your servos that servo reverse won't fix the
problem-you may get the ailerons working properly but not the
elevator response on both servos.
Don't worry: You can fix this problem in the elevon programming
by changing one of the servo travel volumes to a negative value.
2) Now set the amount (and direction if necessary as noted
above) of each servo-both as ailerons and as elevators.
Because flying wings are extraordinarily pitch sensitive
(because the elevator control surface is so close to the
airframe's center of gravity), you generally need the elevator
travel to be much less than that of the ailerons.
We create this type of differential in the next step.
3) For now, leave the "MAS 1" percentage value at the default
100% (unless your servo is stalling) and then CURSOR over
to the "SLV 1" where you will also leave the default value at
100%. Push the CURSOR button again to light up "MAS 2"
and reduce the value to +40%; CURSOR over to "SLV 2"
and reduce that value to +40% as well.
If one of the servo's travel directions isn't correct in the
elevator function, simply make this servo's travel volume a
negative -40%.
4) When you fly the model, if you find that this 40% reduction
isn't enough to take out "pitchiness", land and further reduce
the travel volume. To tone down the roll response, you can
reduce the endpoints of the aileron travel or set up dual-rates
on channel one as described in the setup of Model-1 above.
This function activates another aileron servo (on channel 6
when in the ACRO menu) so that both ailerons can be slaved
together to create a flaperon. This allows both ailerons to move
together as flaperons for camber control or independently as
usual for roll control. In this menu you can also set individual
travel values-upward and downward-for each aileron to create
aileron differential. Being able to move an aileron less in one
direction (usually downwards) helps reduce yaw in turns
(and therefore unnecessary drag.)
FLPN (Flaperon)
Setting up flaperons
1) Activate the program by pushing both DATA buttons-the
"Inh" symbol changes to the default 100% value. With your
model turned on, test the ailerons by moving the joystick to
the right and to the left: To the right, the right-hand aileron
should go up while the left-hand aileron goes down.
If this isn't happening, go to the S REV screen and reverse
the offending aileron.
2) Now check the travel volume: If the servos are stalling at
their maximum throw, turn down the value in the EPA screen
(or move the pushrod further up on the aileron horn to
physically reduce the throw).
Create aileron differential
Now let's create some aileron differential so that the ailerons
move about twice as much upward than downward.
Notice that the "MAS" (master) symbol is blinking along with
channel 1 and the % sign. This means that we can change the
travel value of the right-hand aileron (the master servo).
Also notice that L/U is showing, meaning the value will change
only for left-stick throw.
1) Reduce the downward movement to 50% by pushing down
the left-hand DATA button. Now move the stick to the right
and you will see R/D appear along with the default 100%
throw value.
V.TAL (V-Tail)
V.TAL (V-Tail)
CH2
CH4
CH2
CH4
Up Elevator
Right Rudder (view from rear)
This is another built-in mixing program available in the Optic
Sport that mixes the rudder and elevator servos for controlling
V-tailed aircraft. Similar to elevon programming, the two
Optic 6 Sport - Page 25
2) To create similar differential on the left hand servo
(the slave) push down the right-hand CURSOR button
once-now the "1" and the "SLV" symbols will be blinking.
This time leave the L/U stick position at 100%, then move
the stick to the right to light up R/D and decrease the
downward travel value to 50% with the left-hand -DATA
button.
Now we have differential-each aileron should be moving
downward about half the amount it moves upward.
You will likely have to adjust these values once you fly the
plane and observe the yaw of the fuselage as you roll the
aircraft:
Coordinated turn
Nose Points outside Circle
fuse lines up with turn direction
increase coupling and/or
(don't change anything!)
differential
Nose Points inside circle
Too much coupling or differential.
Reduce one or both.
surfaces can move up and down together (for elevator control)
or opposite (for rudder control in this case).
Note: When you select V.TAL, the ELVN program is rendered
unavailable.
Setting up a V-Tail
1) Activate the program by pushing down both DATA buttons
simultaneously-the screen will change from "Inh" to a % value.
2) With your model turned on, check your servo travel
directions-both rudder and elevator channels-to be sure they
are correct. Go to the S REV screen if necessary to make the
correction.
3) For a basic V-tail setup, you can leave all the values at 100%
so the "ruddervators" will move as both elevators and rudders.
4) If you wish to a rudder control to the aileron stick movement,
refer to the Aileron-Rudder mix on page 26. Use a small
percentage of mix for coordinated turns, or set it up at 100%
mix if your plane does not have ailerons and you wish to fly
it with the right stick.
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