Trouble Setting Up Aileron Differential

[Pilotguy]

My airplane is E-flite Inverza 280. It has 2 aileron servos(one for each aileron). Both servos are plugged into the 1 aileron port on the receiver. Using dx6i Xmtr, in the WING TAIL MIX menu I set DUALAILE to ACT as the manual says. Then in the DIFFERENTIAL menu I set 50%. When I move the aileron stick to BANK RIGHT both ailerons deflect equal amounts (100% up on the right aileron and 100% down on the left aileron. I played around with different differential percentages but in all cases the action is the same.

When I move the aileron stick to BANK LEFT, the left aileron deflects up a very small amount(hardly anything at all) and the right aileron deflects down an equally very small amount(hardly anything at all).

In summary, BANKING RIGHT does not appear to be limiting any aileron deflection, up or down.
BANKING LEFT is limiting both aileron deflection, up and down.

Attached are 2 pix showing my aileron stick input with the above described aileron action(with 75% differential).

How can I get my differential to limit only the downward moving aileron as it supposed to?

thank You...

[xviper]

My airplane is E-flite Inverza 280. It has 2 aileron servos(one for each aileron). Both servos are plugged into the 1 aileron port on the receiver. Using dx6i Xmtr, in the WING TAIL MIX menu I set DUALAILE to ACT as the manual says. Then in the DIFFERENTIAL menu I set 50%. When I move the aileron stick to BANK RIGHT both ailerons deflect equal amounts (100% up on the right aileron and 100% down on the left aileron. I played around with different differential percentages but in all cases the action is the same.

When I move the aileron stick to BANK LEFT, the left aileron deflects up a very small amount(hardly anything at all) and the right aileron deflects down an equally very small amount(hardly anything at all).

In summary, BANKING RIGHT does not appear to be limiting any aileron deflection, up or down.
BANKING LEFT is limiting both aileron deflection, up and down.

Attached are 2 pix showing my aileron stick input with the above described aileron action(with 75% differential).

How can I get my differential to limit only the downward moving aileron as it supposed to?

thank You...

I've highlighted the part where I believe you went wrong. If you are going to control each aileron differently, you can't have them "Y'd" together and throw them into one port. The transmitter can't tell which one is going up and which one is going down. You have to separate them into 2 different ports in order to have any kind of "differential". Setting DUAL AIL means your TX is looking for the other aileron, which in your case, there isn't one because you've got them both plugged into the same port.

[WintrSol]

If you have to use a single channel, the only alternative is to use the servo output horns to create differential. Instead of having them at approximate right angles to the servos, you have to tilt them both in the same direction, so you get more motion of the ailerons in one direction. I just don't understand why you would want differential in a model like that. Flying upright, the differential may work for you, but inverted it does the opposite.

[PappaBear]

WintrSol, you are right. I don't quite understand why you would want aileron differential on an aerobatic model. However I can see more aileron movement in one direction over the other to compensate for engine torque. This would give an even roll rate in both directions. This is often the case. However you do have the same amount of aileron defection up and down. You only increase the movement rolling against engine toque to create the same roll rate in both directions.

Martin.

[WintrSol]

In that case, you would tilt the servo outputs in opposite directions, so the ailerons would move more for one roll command than the other. One notch on each servo output would probably suffice to oppose motor torque, I think.

[Pilotguy]

Thank you for the advice! Adverse yaw is why I want to limit the travel on the downward moving aileron. This airplane slips badly when banked. What this looks like from the ground is a bank in either direction while the nose of the airplane trying to point straight ahead. In full-scale airplanes they compensate for this with rudder input (right rudder when banking right and left rudder when banking left).

Sounds to me like you all would rather I try aileron- rudder mix instead. I will give it a shot and report the results Over this Columbus Day weekend.

[WintrSol]

Do you mean, with roll and elevator it slips in a turn? For that kind of aircraft, without elevator, you can do multi-point rolls with no turns at all; the model continues to point in the direction of travel while it is banked.

If you are turning with ailerons and elevator, I would just use the rudder to counter adverse yaw. The problem with that kind of mix is, it is often speed dependent, i.e., at low speeds there's too little rudder, and at high speeds it's too much. If you only have the use of one hand, though, a mix may be the best compromise.

[gooniac33]

Your plane has a Y connector for the ailerons. No way for you to do differential in the radio. As mentioned above you can use ailerons rudder mix to get rid of the adverse yaw. Or just practice using rudder to prevent the unwanted yaw.

[StormyDog1962]

Or use a 6 Channel receiver and run servo extensions rather than using the Y-Harness to the 2 Channels on the Receiver and then select wing type 2 Aileron servos. Now you will be able to independently adjust each servo. Your plane has no Flaps or Retracts so having extra channels shouldn't be a problem.