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Verticle Stabilizer

 
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pdwalter(at)bigpond.net.a
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PostPosted: Thu Feb 02, 2006 11:51 pm    Post subject: Verticle Stabilizer Reply with quote

Hi Group,
 
As I am part way through the VS I have run into the same problem as I have read about previously.
Plans say to remove 1/8 inch from VS 1013, VS 1005 and VS 1006 so as not to crease VS 1001 Vertical stabilizer skin with the point of these mentioned ribs
 
Now, removing 1/8 has done nothing to solve the problem and at this point I have taken 1/4 inch off and when assembled and you look down through top of stabilizer the ribs do not sit flush in front of skin as I would like. It almost seems like these ribs have not be manufactured correctly.
 
Can the fronts be re fabricated to change the actual shaper of the rib ?.
 
Thank you
 
 
Paul Walter.
 


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indigoonlatigo(at)msn.com
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PostPosted: Fri Feb 03, 2006 7:44 am    Post subject: Verticle Stabilizer Reply with quote

Hello Paul,

If I am understanding your concerns correctly, I think what you are seeing
is that the skin on the inside surface while clecoed to the ribs finds the
nose of the rib(The metal forward of the most forward rib hole) is a high
spot and it causes the skin to dent out. In other words the contour is not
absolutely true and smooth. Perhaps the clecoes are not strong enough to
pull the skin tight to the rear of the most forward hole, against the rib
flanges, but even it they were, the skin will dent in, making the smooth
contour depart from ideal even more. If this is what you are taking about,
here are some options.

You can make cleco washers that will make the cleco springs pull harder. If
you do this and the inside of the skin is now pulled down against the rib
flange than that is good but then again use light on the outside skin to see
the contour. Is there a depression? If so here is my solution.

First, know that in my opinion as long as the skin shape is the same on the
right and the left you are alright. VS is not a lifting airfoil. Assuming
the skin will drape over the ribs equally from right to left side as it is
clecoed, then all we need to do is change the shape of the ribs to conform
to the shape of the draped skin.

This is a technique discussed with someone who worked for Lockheed. It is
called "wet shimming". You can sand the inside skin and the rib flange with
the 150 sand paper, only in these mating areas, clean with acetone or MEK
and bond the ribs in place with the clecoes(Not loaded with the custom
washers) and let cure for a week. Remove the clecoes and re drill the holes
and make sure that there are not lumps of epoxy on the inside of the rib
flanges. Better to do this before cure. Rivet the skin down, but first make
sure the called out rivets are long enough as you have now made the flanges
thicher. I rub vasoline on the cleco tongues so they do not get stuck. I
also soak the clecoes in acetone once I remove them. Or better, buy new
clecoes when you do your fuel tanks.

The epoxy I was writing about is what I used on the nose ribs of my HS. The
problem was much worse on the HS. This stuff drove me, the dentist crazy.
I am also more familiar with composite construction and not metal. Being a
Soaring pilot, I find it very difficult to emotiojnally deal with these
contour fluctuations.

Just my thoughts, for what it is worth.

John G #409
Quote:
From: "Paul Walter" <pdwalter(at)bigpond.net.au>
Reply-To: rv10-list(at)matronics.com
To: <rv10-list(at)matronics.com>
Subject: Verticle Stabilizer
Date: Fri, 3 Feb 2006 18:46:44 +1100

Hi Group,

As I am part way through the VS I have run into the same problem as I have
read about previously.
Plans say to remove 1/8 inch from VS 1013, VS 1005 and VS 1006 so as not to
crease VS 1001 Vertical stabilizer skin with the point of these mentioned
ribs

Now, removing 1/8 has done nothing to solve the problem and at this point I
have taken 1/4 inch off and when assembled and you look down through top of
stabilizer the ribs do not sit flush in front of skin as I would like. It
almost seems like these ribs have not be manufactured correctly.

Can the fronts be re fabricated to change the actual shaper of the rib ?.

Thank you
Paul Walter.


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jjessen(at)rcn.com
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PostPosted: Fri Feb 03, 2006 8:06 am    Post subject: Verticle Stabilizer Reply with quote

Paul,
 
So the new plans have that as part of the VS?  Great.  As to how much, 1/8 inch is about right.  I've attached a picture or two of what I did.  You might also put a flute in the web at the tip, thereby sucking in the sides a bit to better match the shape of the skins.  It's supposed to be tight, but also it's supposed to not be too tight that you end up deforming the leading edge. 
 
Given that you've taken off enough so the ribs do not sit flush, and does this mean you have a gap, then you might want some new ribs.  You don't want an appreciable gap between the nose of the rib and the leading edge.  If it's noticeable, when you try to rivet, you'll push in the skin at that point.  Some other builders might suggest filling that gap with an appropriate thickness of scrape, and that might work, but ribs are cheap.  I'd start again. 
 
John Jessen
  ~328 (Tailcone)

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Paul Walter
Sent: Thursday, February 02, 2006 11:47 PM
To: rv10-list(at)matronics.com
Subject: Verticle Stabilizer

Hi Group,
 
As I am part way through the VS I have run into the same problem as I have read about previously.
Plans say to remove 1/8 inch from VS 1013, VS 1005 and VS 1006 so as not to crease VS 1001 Vertical stabilizer skin with the point of these mentioned ribs
 
Now, removing 1/8 has done nothing to solve the problem and at this point I have taken 1/4 inch off and when assembled and you look down through top of stabilizer the ribs do not sit flush in front of skin as I would like. It almost seems like these ribs have not be manufactured correctly.
 
Can the fronts be re fabricated to change the actual shaper of the rib ?.
 
Thank you
 
 
Paul Walter.
 


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List



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