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Bill. The link between the servo and the control attachment must be lengthened so that the servo arm is operating between 10:00 and 2:00. It can not operate between 8:00 and 10:00 as your set up currently does.
With current set up, when the servo is at about 9:30 your controls will be locked!!!! It is only by pure luck that this has apparently only happened this one time. |
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Dynon Instructions Apparently Dynon installation uses a longer bolt and spacer than TruTrak, and installs the rod-end bushing on the opposite side of the servo arm. I too have the Dynon installation. This is a solid argument for installing the rotation-limiter brackets. I'll be doing so ASAP. |
Time to admit something?
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Either way, I will try installing that rod per the Tru Trak recommendation this evening and report back. I don?t recall why I put that longer bolt in there, there very well might be an interference problem when putting the push rod on the other side of the servo arm or it could be that I simply messed up. Either way, I will report back after I get a chance to pull it apart. |
Bill glad you read the last post before "fixing" and flying again. This is not about the length of the spacer at the attach point. Yes good practice would dictate re arranging the actuation arm to shorten that spacer.... But the most important point is to get the length of the actuation arm correct so that the geometry of the setup is correct
My reccomendation is to disassemble your current setup. Set your controls at the midpoint of travel. Then set the servo arm at 12:00 or 90 degrees to the actuation arm. Then make an actuation arm the correct length to maintain that geometry. Bolt it all together and check that the servo arm only moves throught 10:00 to 2:00 or so AND NEVER COMES CLOSE TO 9:00 while moving the controls through full range of motion |
Bill. The AP servo can not bend the tab. It was the center locked geometry and you pushing the stick that supplied the force to bend that mount tab. Think of a piston at exactly T D C. You can push it down with lots of force but it will not go down until it rolls past T D C. Your servo rod was "at TDC" and there is enough friction in a powered up servo that you can not get it past TDC. Result - locked control
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I just returned from the airport. It is as I feared, there is not enough room on the roll servo to move the bearing to the top of the arm. This leaves me with three options: 1) Make a push rod that bends up. This could allow flex in the tube. 2) Add a doubler to the existing plate. This will require longer bolts. 3) Make a new plate with tabs bent up to stiffen it. This requires me to buy some 4130 and is probably the route I will go. |
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