I built a Fei Bao F18F with a Wren XL200 as my first foray into jets. Being an F3A aerobatic flyer, correcting the track of the model over the ground is second nature but I was shocked to discover that this particular airframe has so much yaw/roll couple that rudder is totally useless for this purpose. Also when flying in any turbulence it exhibits the dutch roll phenomenon.

I fitted an ACT gyro on ailerons reasoning that this would cure the dutch roll and should also supress if not eliminate the roll response from rudder inputs. Initial flight tests have been dissapointing in that I was only able to turn the gain up marginally in flight without instigating roll instability and with the gain set just below this point no significant reduction in yaw/roll couple or dutch roll were observed.

The ACT gyro with its fuzzy logic does have another adjustment other than gain which I have yet to try so there is still some experimenting to do. Also has anyone tried heading hold mode on roll?

Malcolm