I have always thought my GRT AP was too aggressive in it's adjustments and could never get it to be as smooth as I would like fully with gain settings. On a cross country flight, I can watch the nose move as it adjusts. I have always felt that the servo had too course of a resolution, especially in pitch. I have considered changing the throw to see if that would help (I believe it will), but haven't gotten around to pulling the baggage bulkhead to do it.
If I were to venture a guess, the GRT test plane has it's mounting to the elevator bell crank in a non-standard location and therefore providing a less aggressive throw and why they don't see the issue. In the 6, this installation is a builder effort and there is no guidance from Van's on where to put the hole. Only recommendations from the AP providers.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 02-17-2018 at 04:13 PM.