I've got the following problem.
I've been building a MWC (with BMA020 in X configuration) and I'm controlling it with a Futaba FC18 (first version, so "rather old").
When I use the menu 13MIX-TYPE(AC2) on my TX, everything works well.

I can arm and disarm my motors without any problem. (All channels are set to 110%)
But… with the TX in AC mode I can’t get the copter to a stable altitude.

One “down-click” on the throttle and copter descends and one “click higher” the copter ascends too much.
So, I tried the 13MIX-TYPE(HR3) mode on my TX to get more control on the throttle curve.
Everything is working nice so far, I can arm the motors, the throttle is better, but…….I can’t DISARM the motors. I have to pull the battery plug to shut them off.
Please can anybody give me some advice, even better the solution.
