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This has a name
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Second question....are the aileron stops installed and is the measured surface deflection within spec? Quote:
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Rivet drag on aileron attach bracket...
Check to see if you have a very small bit of contact near full deflection on your aileron attach brackets from a rivet...
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2-Stops are installed and deflection is within spec. I just got off the phone with Van's. They said if there is an issue with the heim joint touching the weldment it's most likely at the control stick end. They said there are very small washers that are added between the joint and the weldment to alleviate this issue. I remember installing these washers because they are such a pain but I will double check anyway. He was also saying that if this is an issue he's know people that had to relieve the weldment a bit to clear the joint. I won't be able to get out there until Tuesday but when I do, I think I will: -Move the stick as it is now with the outboard ends disconnected to see if the stickiness is there. I don't remember making that check over the weekend. Of course the geometry will be different than when they are attached so I'm not sure how much this will buy me. -Then I will hook up the outboard ends and disconnect at the sticks then move the ailerons to see if it is gone. -At some point I was thinking of loosening the heim joints, take the ailerons to their limits, then tightening the joints at that point. The guy at Van's actually went out to check on their birds and he said that, at least for the one he tried while I was on the phone with him, there was a small bit of stickiness at the extremes. Some things we were kicking around over the weekend were maybe the mechanical advantage of the bellcrank is less at the stops (confirmed by Van's) and the airloads will make this a non issue in flight (also confirmed by Van's). Van's said this is not a safety of flight issue. Regardless, I'm with you on this Dan, I want to chase this down and get it cleared up. I want my controls like butta at all extremes if that is possible. Regarding rivets, I checked those and they seemed to clear. I'm thinking I'll find the smoking gun during the "twizzle" check but we'll see. I'll send out an update later this week. Thanks again for all the help. |
Not sure if this was mentioned yet, but my main aileron tubes would just barely touch the seat ribs in the fully deflected position. I just filed a little off the rib and all was good.
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newbie dumb*$$ mistake
I went to my hangar at lunchtime (lucky me; it's only 10 minutes on country roads from my office) and continued obsessing.
Then had an aha moment, followed by feeling like a moron. When I installed the ailerons on the wings several years ago, I had failed to observe the admonition in the plans to shim the outer hinge with washers or even a fabricated spacer as necessary to remove side load. Instead, I'd assembled them with the exact washers shown in the plans. Upon loosening said outer AN-3 bolt at the outer end of each aileron, then removing the washers, the problem became instantly obvious. The hinge bracket wanted to be somewhere else. After some bending, fussing, getting down on my knees and scrutinizing, I reassembled. The control stick now falls to the side once either aileron travels upward more than 10 degrees or so. Not sure how I managed to overlook that, other than being a relative newbie when I assembled the ailerons the first time. Contrast that with the nearly 30 hours of increasingly frustrating obsessing I did over elevator bind. But my elevator floats freely as a result, even with the added drag of an autopilot servo. Despite that effort, I completely overlooked the ailerons and convinced myself that the stiffness was due to the roll servo when I installed the wings a couple of months ago. Duh. |
Glad you figured it out Lars! :D
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Flap hinge pins too long?
A strange one that I had was caused by flap hinge pins that were too long.
At nearly full aileron deflection the aileron hinge bracket was touching and bending the end of the pin. I still got full deflection but an increase in resistance. |
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I can't wait to get out to the hangar after work to take another look at mine. |
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