I've been running 6v in my airplanes for quite some time now, in most cases unregulated without any problems, so I don't think that's the issue.

I hate to speculate on what a problem might be because it only serves to snowball on itself I think, and leads to misinformation more than actual info.

What you guys have done is the best approach in my opinion, that is send the failed servos to Horizon Service and have them look them over. I know some of the guys in the service department fairly well, and will give them a heads up on this. Maybe there is something specific to the time frame the servos were purchased.. maybe not. I don't know.

But to answer the original question, either one will work, and I doubt there is any reason to choose one over the other for this application. Because this is a low vibration application, there is not going to be the same kind of gear wear noticed in helicopters (where the SA version originated).

Doug Cronkhite
Team JR