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 Posted: Thu Aug 16, 2007 10:00 am Post subject: F641 |
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To the RV-6A builder with the clearance issue (sorry, I deleted the original message):
I checked my aircraft today and you should not be having an issue. I think the others who have replied to the effect of ‘cut or file for appropriate clearance’ are misunderstanding that the F641 is the tunnel cover / seat skin. However, in their defense, it’s hard to see how you’d have clearance issues with the F641 without also having clearance issues with the F605 and F606 bulkheads; I definitely had to do some trimming there when I fitted mine. However, that doesn’t really address your problem, so I played around with my setup and I think I may have an idea of what is happening; you will have to confirm or deny.
If I disconnect the rear pushrod at the transfer bellcrank, I can get close to the same interference (actually, I end up rubbing on the F605 bulkhead first) as the stick approaches the F604 bulkhead (which has been trimmed per the plans). I think this is what you are seeing. However, with the rear pushrod attached (and the elevators in place, etc.) the elevator stops prevent me from moving the stick that far forward and there is no clearance issue. The stick is then approximately 7/16” from the front of F604 on my aircraft. Also, when the elevator is neutral, the upper portion of the stick should be perpendicular to level; if you make the lower portion perpendicular instead, then the stick will be canted too far forward and you may, again, have some clearance issues. The key here is to start at the back; install the elevator, rear pushrod, and then install the stops, making sure you get full movement of the elevator. Then set the elevator to neutral and attach the rear pushrod to the transfer bellcrank, adjusting to make sure the bellcrank is vertical. With the elevator still held in neutral, make up the forward pushrod from transfer bellcrank to stick assembly, making sure the stick is vertical fore/aft with the elevator neutral. At this point, check the motion of the pushrods for clearance. I think you will find it works fine.
If that is basically what you have done, then you will need to recheck everything: height and orientation of the transfer bellcrank, height and orientation of the stick assembly mounts, and even the stick assembly parts (in case Van’s made an error). Hopefully, this note finds you already with a solution in hand.
Patrick Kelley – RV-6A – Still waiting of panel (it’s been cut and painted, now in wiring. Est. 2 weeks to arrive)
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