How did you setup your radio?
I propably should have done a detailed explanation of configuring the radio at the time I released the model, its a long one but here it is.
So first of all, I'm using a frsky radio running opentx firmware. I have 7 channels and 6 inputs in use. 4 inputs for the conventional controls, one 3 pos switch for flapperons and one 3 pos switch changing between the 3 flightmodes. Sweep angle is determines by flightmode. The reason why the wings are controlled via flightmodes is because it allows for the use of different throw limits, expos and elevator trim for each wing position. Thats quite important since its way more roll sensitive with a high sweep angle. It also allows the flapperons to work only in the extended mode. This is also important since the flaps are physically prevented from being in the down position while the wings are retracted. Elevator and ailerons are mixed together to elevons, flaps and ailerons are mixed together to flapperons while the rudder is just minding its own business.
So this is the goal of how it should behave, now this is how I configured it in the transmitter. Im not sure how firmware specific this is but Im guessing its very similar in all opentx controllers. (Note that this is most likely neither the only nor the best way of doing this but its how I did it)
3 different flight modes, 0, 1 and 2 respectively corresponding to extended, half swept and full swept.
fm0 trims are set to 0, 0, 0, 0 which are respectively the common aile, ele, tro, and rudd trims of flight mode 0.
fm1 trims are set to 0, 1, 0, 0 which means it is using its own elevator trim, other trims are the common fm0 trims. Correspondingly
fm2 trims are set to 0, 2, 0, 0
Each flightmode has a fade in and fade out time of 1 sec to make transitions more smooth.
6 inputs: (number refers to amount of throw, exp number refers to expo curve weight)
Aile100, exp 70
Ele100, exp 70
Rudd100
Thro100
Flap50 (Throw limitedto 50% combined with an offset to prevent the flap from going in the reverse direction)
Swe100
Mixes: (number -100 to 100 refers to the amount of throw)
CH1:
For fm0: Ele-100, Aile100 (Equal throws for elevator and aileron)
For fm1: Ele-100, Aile60 (Less aileron throw on fm1 and 2)
For fm2: Ele-100, Aile50
Ch1 physically connects to either elevon servo
CH2: Same as CH1 but one reversed:
For fm0: Ele100, Aile100
For fm1: Ele100, Aile60
For fm2: Ele100, Aile50
ch2 connects to the other elevon servo
CH3: Throttle, nothing to mix
CH4: Rudder, nothing to mix
CH5:
For fm0: Flap100, Aile100
For fm1, 2: Either nothing or in my case I put Flap0 (0 throw) but with a slight offset so the flap is positioned just right when it slides
inside the cover.
ch5 connects to either flapperon servos
CH6: Swe90, adjust this throw so such that the wings fully extends and retracts but the servos doesn't scream in pain at maximum travels
2 seconds of slow up and slow down to make the wings retract slower
ch6 connects to both wing servos
CH7: Same as ch5 but flap reversed:
For fm0: Flap-100, Aile100
For fm1, 2: As above
ch7 connects to the other flapperon servo
I hope this helps. Remember that all the throw limits, expo weights etc. values are there just to give you a starting point. You can try different values that works for you. These values were a guess of mine and they weren't terrible so I kept them.