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-   -   Elevator Rub (https://vansairforce.net/community/showthread.php?t=163158)

Breezy 08-13-2018 12:59 PM

Elevator Rub
 
Mounted Elevator to Stab. Very closely measured the eye bearing distance from stab spar. When moving elevators to travel limits there is rubbing at the HS 912 mount flange and the leading edge of the elevator. Center of leading edge has clearance the contact occurs in the last degrees of the travel limits. Tried backing out the eye bearing a turn to gain additional clearance but not enough.

Any others encounter this?

mountainride 08-13-2018 01:21 PM

I experienced this as well using the exact specs from the book. Its close tho, it doesn't rub until the last degree or two publish in the book. I am not going to mess with it until I set the travel limit later in the build. If I need to back out the bearing a turn or two or even shim the torque arm bearing out .32 I will do that later. After checking out a completed -14 I still have hope that there won't be any rubbing at all once I set the travel limits.

-Jason

PatrickN 08-13-2018 02:59 PM

Funny, I ran into this exact problem yesterday! I tried messing with the shape of the leading edge yesterday without much success, but the thought occurred to me this morning that I may be able to back out the rod end bearings a half turn or two. Also interested in how people have dealt with this in the past.

mturnerb 08-13-2018 03:01 PM

I had to back out rod ends a couple of turns. Discussed with EAA tech counselor. Most critical is to be sure you don't have too many threads exposed on the rod end AND properly torquing the jam nut.

JoeRV14 08-13-2018 03:10 PM

Different rod end bearings?
 
I thought I saw Vans will send a set longer rod end bearing to RV14 guys as this is a known problem. I?ll check the reference when I have more time. Joe (RV14)

Breezy 08-14-2018 09:20 AM

Spoke with Vans. Was told there could be up to 4 threads beyond the jamb nut and still have engagement in the nut plate. Discussed the use of a different eye bearing (MD3616M), however the ball width is greater and would not fit in existing brackets.

JoeRV14 08-14-2018 12:51 PM

Thanks!
 
Thanks for doing the legwork! Almost at that point so this helps a lot. Joe

LarryE 08-27-2018 12:57 PM

Elevator rubbing
 
I had the same problem. Van?s has a longer resend that will fit in existing brackets. It solved my problem but created other issues I had to compensate for.

JoeRV14 08-27-2018 07:14 PM

Thanks
 
Thanks Larry! I think I asked you a million questions at Oshkosh and drooled a little on your 14... Lol - Joe

MonkeyWrench 02-19-2019 06:07 PM

Quote:

Originally Posted by LarryE (Post 1283986)
I had the same problem. Van’s has a longer resend that will fit in existing brackets. It solved my problem but created other issues I had to compensate for.

Hi Larry,
I just ordered the longer rod end bearings Sterling recommended (BEARING MM-3M-42).
Did you all get them for free?
What other issues does this create? I had to pull mine out from 20.6mm to 23.11mm (2.5 turns from 20.6mm).

https://www.evernote.com/shard/s203/...nd%2Bbearings/

iamtheari 02-19-2019 06:35 PM

I had rub on the leading edge of my elevators where they met most (maybe all, I can't remember) of the AN470 rivet heads that attach the hinge brackets to the HS rear spar. I was able to massage the leading edges enough to eliminate the rub through the entire range of travel. Just posting this as a data point for posterity.


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