I just recently upgraded to the DX6i, In the book it says to add + expo to desensitize controls. But i have read Futaba is neg, I want to get this right before i try and fly

That's normal. Spektrum/JR uses positive expo to soften the control input and Futaba uses negative. The result is the same. It took me a little getting used to as well when I bought my DX-7.

It just comes down to how Futaba and Spektrum names functions.  What's negative for Futaba is positive for Spektrum.  You can test it by putting in a lot of positive expo in the 6i and see how the control surface responds.  If it's soft at the beginning of the throw, they you know it's what you want.  If it deflects rather abruptly, then it's the opposite of what you want, assuming that you want to soften up the controls, that is.</p>


CGr</p>

Yep, ......I found out by demonstration!!!  I asked my buddy, who said his system was Futaba...which to use.  He suggested negative, but cautioned me that his system might be different than my Spektrum.</p>

I wasn't smart enough to check it out on the ground..so once I put the plane up,..... I noticed that it had a case of the "jumps".   I brought her down fine and changed it around.  No harm done, luckily....</p>

Many things in this hobby are just not "standard".   At least in photography/cameras...there are some standards that most companies seem to follow.   regards, Rich </p>

Yeah, if you get the expo polarity wrong, things will get pretty interesting!

PKH, the problem comes with the different manufacturers using positive where others use negative and vice versa.  Since there is no connection with the various manufacturers, we have to live with the differences.  </p>

I won't say most, because there are some that are very specific about what radio they will use... only Futaba, only Hitec, only Airtronics, only Spektrum, and so on.. so they get their expo polarity, use it and that's that.  Most don't even care if it's negative or positive, only that they put it in, it works, and that's the end of that game.</p>

But, when modelers mix, well, the confusion is evident and the only answer is to experiment using low numbers (if flying) or do as I suggested earlier.. put a lot in, remain on the ground, deflect the control surface, and see what happens.  If it isn't what you expected, then use the opposite polarity and check it again.  Hopefully, all will be ok after the re-check and you're ready to go.</p>

CGr.</p>