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I was able to look at the Robertson rigging procedure today when I stopped by the shop. It does indeed recommend that 1/4 inch of right upward aileron deflection be applied after the full procedure is done to allow for the airplane to fly with trim tabs zeroed. As far as I can tell this was never done either before or after I had the plane re rigged two years ago. I don't know why this is required aerodynamically, but it is part of the procedure. Based on what I have seen this should resolve at least half of the required yoke rotation. The plane is going back together during the annual and we will put this in and see how it flies. I had to do the eddy current spar inspection for 5500 hours so its taking a bit longer to get it back in the air. Its raining cats and dogs here anyway so better to be in a cozy hanger.
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