Geoff Heap
Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey
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 Posted: Sun Sep 17, 2006 1:28 pm Post subject: 701 Aileron rod horn interference |
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I bought the control kit from ZAC. After assembly I see that without the elevator wires hooked up, the torque tube is able to slide forward until the boltheads going through the aileron rod horn 7C2-3 (and rod ends) interfere with the top flange of the BOTTOM CHANNEL 7F6-1. In this position the ailerons cannot work. The only scenario I can see where this can be disastrous is if the elevator wires go slack in flight (for any reason you care to think of) In this situation hopefully the wires just go a little slack ( I'm not even talking about complete failure such as a broken wire). OK, but now there is no tension from said wire to hold the torque tube in the aftmost position. If the torque tube now slides forward about 5/16" I've lost aileron control. There is an in flight fix for this which is not acceptable to me. Simply push the torque tube back with my right hand and aileron control is back.
Variation in assy from one 701 to another does not alter this condition that I can see. On page 7C2 two dimension changes for the rod horn would solve this. Dims 25 mm and 8 mm should both be increased by 9mm to 34 and 17.
I solved this to my satisfaction with a piece of pvc tube from home depot cost about 0.50c. OD is 1.25. I had to open up the ID to 1.135 then cut it off and belt sand it to .30 long. It weighs nothing and hopefully will sit there for years doing nothing as it doesn't touch anything. But one day..............it might have a job to do. see attached
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