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  #1  
Old 12-18-2010, 06:38 PM
Berchmans Berchmans is offline
 
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
Default Elevator Horn Main Bearing

I am at the point were I am fitting up the elevators. I have them installed and distances correct so that the elevator horns line up nicely. However I note that the the elevator horns that I have are not pre-drilled for the installation of the AN 4 bolt that joins the two elevators through the main support bearing in the center. This is not the point were the control rod will attach but the bearing above were the elevators are joined. I have looked through the plans and instructions but can find no information or references to drilling those holes. Any suggestions from the membership would be most appreciated..........
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  #2  
Old 12-18-2010, 06:55 PM
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cfiidon cfiidon is offline
 
Join Date: Apr 2008
Location: California
Posts: 652
Default It's there

I don't have my reference handy, but the instructions are in the narrative plans with references to the drawing.
If I recall correctly, you must position each elevator precisely the same on each side. I used a micrometer or an accurate rule to make sure the rod end bearings were all threaded the same. With one, and then the other elevator mounted, you use the center bearing as a drill guide. Look at it closely and make sure the completed hole leaves enough edge distance on the elevator horn for the bolt head and nut that will go through all three pieces. Mine turned out very close, but doable. You can use a small piece of tubing as a drill guide in the center bearing initially, then enlarge the hole after a pilot is drilled.

Again, pour over the instructions... it's in there somewhere.

Good luck.
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  #3  
Old 12-18-2010, 07:05 PM
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BSwayze BSwayze is offline
 
Join Date: Jul 2007
Location: Molalla, Oregon
Posts: 955
Default Here's how I did it...

Hello Burke,

I just did this a while back on my own empennage, and I documented it with pictures and all starting here:

http://www.europa.com/~swayze/RV-7A/.../20100605.html

It starts near the bottom of this particular page and continues on from there. Mine turned out great.

Good luck with yours!
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  #4  
Old 12-18-2010, 07:25 PM
Berchmans Berchmans is offline
 
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
Default Thanks

Thanks for the input. I didn't build the emp. as I purchased the kit from an individual had done most of the work on it already. I just had to do the tips and then start on the wings. I figured that there was a method but I had not come across it in the documentation so far...this type of reponse is what makes this website great. It has saved me hundreds of dollars so far in not having to order replacement parts...it's 10 below here right now.......
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  #5  
Old 12-19-2010, 02:40 AM
rv8@ph-cya.nl rv8@ph-cya.nl is offline
 
Join Date: Feb 2009
Location: Netherlands
Posts: 33
Default

Hello Burke,

I used a transfer punch set for this.
I attached the elevator to the horizontal stabilizer (one at a time) and used a correct sized transfer punch to mark the centre on the horn from the other side. I then dismounted the elevator and repeated the action on the other side. I then used progressively larger drills to drill the elevator horns.
This worked out great for me.

Kind regards,
Duncan
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  #6  
Old 12-20-2010, 10:22 AM
Berchmans Berchmans is offline
 
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
Default Success

Thanks for all the input. I made a bushing out of 1/4" tubing. Drilled pilot holes and removed the elevators for final drilling. The holes lined up perfectly and the elevator moves freely with no binding...Drilling the lower attachement point went well too. Followed the directions and edge distance on all holes came out just fine...working on controls now.
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  #7  
Old 12-21-2010, 07:38 PM
DENMACRES DENMACRES is offline
 
Join Date: Aug 2008
Location: MONTGOMERY, TX.
Posts: 89
Default elivator

be sure to shim the center elevator horns when attaching to the center bearing, if the bolt pulls the elevators together it will bind the other bearings and cause elevator to not move freely. Dennis
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  #8  
Old 12-21-2010, 08:28 PM
Berchmans Berchmans is offline
 
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
Default All done

I did the spaces by super glueing the requisit number so washers together...worked great...also note it is a good idea to put some paper towels under your work area so you don't have to fish the washers out from under the tailwheel housing........
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  #9  
Old 02-17-2016, 07:26 AM
RaysRay RaysRay is offline
 
Join Date: Feb 2016
Location: Delray Beach Florida
Posts: 2
Default drilling elevator control horns

after marking and drilling the elevator control horns I find that I am misaligned by about 1/16th inch. Is there a solution, or a problem elongating the hole 1/16th ? Thanks in advance for your responses.
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  #10  
Old 02-17-2016, 08:26 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
Default Fix

I believe the fix is to take them to a welder and have the holes filled. File smooth and redrill. Repaint.
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Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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