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RV-7 Elevator mismatch

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davercook(at)prodigy.net
Guest

Posted: Wed May 23, 2007 5:44 pm Post subject: RV-7 Elevator mismatch

Listers

  

 A friend is building a 9a. When I visited him today, he showed  me a problem with his elevators. With the elevators in trail with the  stabilizer, the counter balance arms did not align. One arm was up 3/8" the  other was down 3/8" while the control horns were matched. Question Any one else  have this problem? Hard to see any twist, but it is the only thing I can think  of.

 David R. Cook

RV-6  N815DC Flying  11Hours

   [quote][b]

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ceengland(at)bellsouth.ne
Guest

Posted: Wed May 23, 2007 6:12 pm Post subject: RV-7 Elevator mismatch

davercook wrote:

 	  Quote: 	
		   Listers

  

 A friend is building a 9a. When I visited him today, he showed me a 

 problem with his elevators. With the elevators in trail with the 

 stabilizer, the counter balance arms did not align. One arm was up 3/8" 

 the other was down 3/8" while the control horns were matched. Question 

 Any one else have this problem? Hard to see any twist, but it is the 

 only thing I can think of.

 David R. Cook

 RV-6  N815DC Flying 11Hours

 

 *

It's been a long time since I built the elevators on my -7 project, but 
	


IIRC, the control horns have enough meat to allow aligning the elevators 

properly & then drilling as needed, with the holes possibly not centered.



Remember, the -9 has a totally different hor. tail.



Charlie

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dsvs(at)ca.rr.com
Guest

Posted: Wed May 23, 2007 6:15 pm Post subject: RV-7 Elevator mismatch

When  your friend gets to drilling the horns he will read that they almost never  match. The elevators may not actually be in trail when the copunterbalance arms  ate not matched to the HS.   

 [quote]   --

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Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Wed May 23, 2007 6:23 pm Post subject: RV-7 Elevator mismatch

The control horns matching is irrelevant. They don't factor  in this process at all.  The only thing that needs to happen here is the  elevators trailing edge aligning with one another while the    counterbalance arms clamped.

  

 I would want to confirm this a little more and I think I  would clamp the arms...and take a laser level and -- making sure the HS is  level, of course -- line it with the trailing edge on one and see how the other  stacks up.  At the same time, that should, I would think, reveal any twist  in the individual elevator. 

  

 Do not  archive.

 



   From: owner-rv-list-server(at)matronics.com  [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of  davercook

Sent: Wednesday, May 23, 2007 8:44 PM

To:  RV-List

Subject: RV-7 Elevator mismatch

 

 Listers

  

 A friend is building a 9a. When I visited him today, he showed  me a problem with his elevators. With the elevators in trail with the  stabilizer, the counter balance arms did not align. One arm was up 3/8" the  other was down 3/8" while the control horns were matched. Question Any one else  have this problem? Hard to see any twist, but it is the only thing I can think  of.

 David R. Cook

RV-6  N815DC Flying 11Hours

[quote]



href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List

href="http://forums.matronics.com">http://forums.matronics.com



[b]

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_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

retasker(at)optonline.net
Guest

Posted: Wed May 23, 2007 6:25 pm Post subject: RV-7 Elevator mismatch

The problem is that he is aligning the control arms.  The instructions 

specifically state that it is not necessary nor appropriate to line up 

the control arms.  One aligns the two sides of the elevator and then 

drills the control arms at the same time with some sort of jig to make 

sure you are drilling perpendicular to the arms.



The control arms typically do not line up perfectly.  Unless they are so 

far out that one cannot drill straight through both without getting too 

close to the edge of one or the other there is no problem.



Dick Tasker



davercook wrote:



 	  Quote: 	
		   Listers

  

 A friend is building a 9a. When I visited him today, he showed me a 

 problem with his elevators. With the elevators in trail with the 

 stabilizer, the counter balance arms did not align. One arm was up 

 3/8" the other was down 3/8" while the control horns were matched. 

 Question Any one else have this problem? Hard to see any twist, but it 

 is the only thing I can think of.

 David R. Cook

 RV-6  N815DC Flying 11Hours



*

*




	


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Vanremog(at)aol.com
Guest

Posted: Wed May 23, 2007 7:49 pm Post subject: RV-7 Elevator mismatch

In a message dated 5/23/2007 6:47:02 P.M. Pacific Daylight Time,  davercook(at)prodigy.net writes:

  	  Quote: 	
		     A friend is building a 9a. When I visited him today, he    showed me a problem with his elevators. With the elevators in trail with the    stabilizer, the counter balance arms did not align. One arm was up 3/8" the    other was down 3/8" while the control horns were matched. Question Any one    else have this problem? Hard to see any twist, but it is the only thing I can    think of.

	


 

 =====================================

  

 I can't believe that Van's hasn't solved this problem in the 12 or 15 years  since it has been going on.  I ended up cutting, undersleeving and  rewelding one side to reclock it, so I wasn't ashamed to put that poor  fitting original piece of cr** on the plane.

  

  

  

 GV (RV-6A N1GV O-360-A1A, C/S, Flying 845hrs, Silicon Valley,  CA)





See what's free at AOL.com. 

  [quote][b]

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kahamer(at)bigpond.net.au
Guest

Posted: Wed May 23, 2007 10:21 pm Post subject: RV-7 Elevator mismatch

     I had a similar problem in my 6A  just not as much mismatch.Had the holes in the control horns welded up (actually just in one of them) aligned the elevators and redrilled.  

            It is very important to use a predrilled block of  hard material to guide the drillbit so it is exactly perpendicular to the control horns.   

            Was a simple fix.  

            Regards  

            Karl Ahamer  

            7A near Sydney(cowling….)  

   

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rv9jim(at)juno.com
Guest

Posted: Thu May 24, 2007 5:14 am Post subject: RV-7 Elevator mismatch

Dave,

        I had the same problem.   The solution is to move one of the rod

ends in or out that suport the horiz stab.  It drove me bonkers untill I

was removing the stab's and I accidently moved it only a bit rearward and

suddenly all things lined up.  I then rotated the rod end one half  rev

and re-assembled it and it was almost where it needed to be.  I then

rotated it one more half turn and the counterweights line up and it was

great.  The one rod end I rotated was the one closest to the fuselage not

the outside rod end.   Problem solved!

Jim Nelson

RV9-A

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