A strange phenomena on 2 identical Fusion 50 helis. We are both trying a knife edge piro move where with the heli if ff in to wind we roll 90 degrees and then apply left rudder, after 360dgs we roll back upright and carry on in ff. Both models are using the AR7200Bx and both have DS610's on cyclic and 620's on the rudder. One uses a Kontronic Hv ESC and one a CC 80Hv with a governed headspeed of 2100. Both roll perfectly but when rudder is input there is a pause of around 1 to 2 seconds before tail movement starts, and this movement is then extremely fast and it whips round sort of uncontrolled.
Again a Fusion with V Bar does not exhibit this behaviour although it is using a ds650, anyone any ideas.