|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

07-13-2017, 07:05 PM
|
 |
|
|
Join Date: Jul 2005
Location: Bolingbrook, Illiniois
Posts: 254
|
|
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
__________________
Paul
N694BP reserved
RV-6A Very Slow Build!
Last edited by pczar3 : 07-14-2017 at 06:38 AM.
Reason: trying to post pictures from google photo
|

07-13-2017, 08:00 PM
|
|
|
|
Join Date: Jan 2005
Location: Peshtigo, Wisconsin
Posts: 768
|
|
Pictures aren't being displayed
__________________
Jeff Orear
RV6A N782P
Peshtigo, WI
|

07-14-2017, 06:02 AM
|
 |
|
|
Join Date: Jul 2005
Location: Bolingbrook, Illiniois
Posts: 254
|
|
Back to the drawing board trying to insert pictures
Well I guess I was done in by google photos. I'll try again!
Paul
__________________
Paul
N694BP reserved
RV-6A Very Slow Build!
|

07-14-2017, 06:50 AM
|
|
|
|
Join Date: Aug 2014
Location: Victoria, Tx
Posts: 421
|
|
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.
|

07-14-2017, 07:05 AM
|
|
|
|
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
|
|
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.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
|

07-14-2017, 09:07 AM
|
 |
|
|
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
|
|
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.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
|

07-14-2017, 09:24 AM
|
 |
|
|
Join Date: Jan 2010
Location: Delta BC
Posts: 122
|
|
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
__________________
Alex Doughty
Canadian ATPL
Flying!!
|

07-14-2017, 11:08 AM
|
|
|
|
Join Date: Dec 2009
Location: Montreal
Posts: 1,456
|
|
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.
__________________
Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
|

07-14-2017, 11:14 AM
|
 |
|
|
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
|
|
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.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
|

07-14-2017, 12:55 PM
|
|
|
|
Join Date: Dec 2009
Location: Montreal
Posts: 1,456
|
|
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.
__________________
Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:33 AM.
|