Well guys I have to preface what I am about to suggest with the fact that I have had NO experience with the JR stuff, until the current project that is on my table right now. A friend and I are assembling a BVM Kingcat for another person and we decided to go JR all the way since this is a $10K airplane and BVM pushes the use of JR stuff in their jets pretty hard, the radio set up is described using JR equipment so it was sort of a no brainer.

Something we noticed was during the elevator servo installation. The Kingcat uses a pair of 8411's on a split elevator, driven with a "Y" connector. The 8411's buzz and sing quite a bit, so much so that we thought we had done something wrong. The linkages are pretty tight but you certainly don't want ANY slop in a jets surfaces so we didn't think this was a problem.

Get this.....we were doing the set up with the horizontal stab off the plane and just out of curiosity I turned the whole thing up on edge and guess what......the buzzing stopped completely. As it turns out the 8411's will buzz with nothing more than the weight of the elevators pushing back on the servo arms. Turning the assembly from horizontal to vertical several times confirmed this to be the case, hold it flat and it sings like crazy, turn it up so the weight is off the servo and it's as quiet as can be.

I have never had a Futaba or a Hitech do this so I thought something was serviously wrong, it turned out to be a false alarm and quite normal. I think what I am trying to say here is that sometimes we expect a certain behavior based on what we are used to and see things that we think are problems that really aren't.

Not that a jittery servo isn't a problem but if they were just buzzing I would say turn it up and see what happens.