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  #1  
Old 07-13-2017, 07:05 PM
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pczar3 pczar3 is offline
 
Join Date: Jul 2005
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Unhappy How can I deal with this Horiz. Stab

Well I am finally at the point of mounting my horizontal stab on my VERY slow build 6A. After wrestling with the stab for a while I decided to check the rear spar mounting bars. One, the blurry image, is the good side. The square is flat against it and the other leg falls right on the center line (picture 1). The other side is offset towards the back of the plane 0.125 on the outside and one sixteenth on the inside. Has anyone else run into this and what was the fix? Thanks in advance.


Here's the good one:

This is the problem!


I hope the pictures show up now. I see them when I look at the page.
Any help appreciated!
Paul
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Last edited by pczar3 : 07-14-2017 at 06:38 AM. Reason: trying to post pictures from google photo
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  #2  
Old 07-13-2017, 08:00 PM
painless painless is offline
 
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Pictures aren't being displayed
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  #3  
Old 07-14-2017, 06:02 AM
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pczar3 pczar3 is offline
 
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Unhappy Back to the drawing board trying to insert pictures

Well I guess I was done in by google photos. I'll try again!
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Old 07-14-2017, 06:50 AM
219PB 219PB is offline
 
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I would ask Vans. If they allowed a shim that would be an easy fix. But I suspect that they would not due to the bending stresses in that joint. It should be in pure tension under load.
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  #5  
Old 07-14-2017, 07:05 AM
BillL BillL is offline
 
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Photos work now, but not sure what the design tolerances are, so you need Scott McDaniels to address this one. Or some of the sages here.
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Old 07-14-2017, 09:07 AM
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Clamp your HS into position onto the tabs, with the .125 spacer installed under the HS Spar per plans. Find the fuselage center line and then measure from the fuselage center line, as far forward as you can, like the firewall or seat back brace, back to each HS tip. Compare those measurements. I believe this process is documented in the manual. This will tell you if that bulkhead is indeed square or not. You might get lucky as variances in the HS might offset those of the bulkhead. You might find you have less of an issue than you think.
Also, examine the bulkhead and see why that bar is twisted.
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  #7  
Old 07-14-2017, 09:24 AM
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Mine were like that too, but that stab only needed very slight re-alignment. Remember even half an inch of movement at the tip is a tiny movement at the root. A call to Van's definatley a good idea if you have any concerns though!

Alex
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Old 07-14-2017, 11:08 AM
sblack sblack is offline
 
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You might need some custom angled shims. Do you know a local home shop machinist? Easy for them to make. If not PM me. Above all, don't panic. My vertical fwd spar missed its pickup on the hstab by 1/2"! I was able to work around that. These older kits are not as easy to build. Creative shimming required.
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Old 07-14-2017, 11:14 AM
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az_gila az_gila is offline
 
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I think a shim would be called for and be acceptable, and I also bet that this was probably not that uncommon on the not pre-punched -6 fuselages.

A call to Vans should be made to confirm, but as a previous poster mentioned install the horizontal first with clamps and align per the plans so that you have an exact measurement of the thickness of any shims needed.
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  #10  
Old 07-14-2017, 12:55 PM
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However you shim it, make sure the head of the bolt and the nut are on parallel planes. So if the stab is one one plane and the mounting tab is at a 3 deg angle to it with a 3 deg shim, make sure you have a shim under the head of the nut so that you are not putting a bending load on the bolt when you tighten it.
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