AM.. Try this on a 9C

I tried this with 2 different Rx's and the same TX.

With a new plane setup, select Glid 2 Flap as the type.

Go to the aileron differential setup mix and hold the right stick to the left of center.

Now turn the dial to the left so that the Aileron 1 is set to
-1% +100. I left Aileron2 to the default of +100 +100

For some unknown reason the radio's output to flap1 (Ch5) is reversed. This is confirmed by going into the Servo screen and watching the output. By turning the Flapt trim knob, the flaps move opposite of eachother. When you change the Aileron 1 differential back out of -1% the output to CH5 is normal, with the flap trim knob(VrA) moving both flaps in unison.

Whoa... why is that? I would hope to never set any sailplane up where I needed -1% differential, but nevertheless, I don't think the radio should reverse output on a channel with no other mixes created.

Does your radio do this?? I am now leary of any other odd settings that could make my radio have strange outputs.

Please advise,
Thanks,
Steve Giron

Hi, invert!

I cant create what you describe. Going to -1 reverses BOTH numbers to negative. its one more way to deal with a reversed servo. and is intentional in the programming of the radio.

If you think about it, asking for -1% differential is telling your wing you want, on left turns, for the left servo to go up x%and you want hte right servo to also come up 1%. you've asked the radio to reverse the servo's action, and it is doing exactly what you've requested of it.

Lots of times we run into folks playing with a function asking it do what they think they're asking, but they are really asking for something else and the radio does something different than they expected. This is just one of those cases, unless i'm misunderstanding something.

PS: ail2 is channel 7 not 5?

I have my aircraft set up like this

1 = Left Aileron
2 = Elevator
3 = Airbrake
4 = Rudder
5 = Left Flap
6 = Right Flap
7 = Right Aileron

You are correct about both sides being negative when you change the left side on the differential menu.

It shouldn't matter what value I set the differential to, on CH1, CH5 should not reverse due to a value in CH1's differential setting.

The flaps should always move together with the flap trim, regardless of the aileron differential. There is no aileron > flap mix enabled on my radio either. Actually differential is the only thing that needs to be changed to get this to happen.

Can you try your test again AnnMarie?

Thanks,
Steve

Hi, Steve! I'm at home. please confirm for me...both channels 5 and 7 reverse when you go to negative diff?

For me, just the output of channel 5 went into reverse when -1 differential was entered.

Another 9C user that I helped via email setup his radio emailed me today and confirmed his did the same thing but on both flaps CH 5 and 6.

I sent you a PM as well.

- Steve

Hi Steve, did you manage to solve the problem ? What did you have to do ? I was following this thread as I'm a 9C user too. Thx........

I talked to AM Cross on the phone and she verified that her radio does the same thing. She informed me that she will let the folks @Futaba Japan of this. I don't know what happens from here. Maybe the fix will be in the 9C Super???

<<unnecessary rant removed>>

is this something that will never happen in normal programming as you don't need negative aileron differential ? Hope that some clarification will be forthcoming from AM.............

Rajul,
Yes, this is something that would never be encountered in normal use.

Hi AM, thanks for the response. That's what I thought as well. Then Futaba should not have allowed -ve values to be keyed-in in the first place ! Or is there another reason why -ve values are allowed ? Kindly enlighten us. Thanks............

Rajul,
Futaba tries to leave as many possible options open as they can without setups that would be dangerous if misused. This setup is one that would normally never be used, and as it is not functioning properly we have suggested that Japan change it to only allow positive values in the future.

Your patience and courtesy and, most of all, NOT Futaba bashing before having the facts on an item will be MOST appreciated.

Yup, I agree with you that we should always focus on the issue, After all its only a hobby. Bash and thou will be bashed in return (Law of Karma).

BTW I will be receiving my microprocessor-upgraded 9C this week (v-tail correction). Any idea if the -ve value was eliminated in this version ? Anyway, even if it was not, it is not a real issue as user has the option not to select -ve values. But the v-tail was a real issue .

Thanks for your support and don't worry about unfair bashing. We'll come out in support of you if we see one. Simply put, we need you to be around as you have done a great job...........