RE: hitec 555 and trackerII
I have several 555's that I use with my Polk, but I don't have flaperon on any of those models. I am also under the impression that the polk requires channel 6 to be flaps. However, I seem to recall someone on here a while back who sent their radio back to the folks to Polk who made a quick change on his TX to make flaps channel 5. Not sure what version of the software that was done with.