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Spar Spacers

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MTBehnke

Joined: 13 Sep 2007
Posts: 3

Posted: Thu Sep 26, 2013 9:21 am Post subject: Spar Spacers

I'm working on joining the forward and center fuselage sections.  When I bolted the two spar sections together with the (13) .125" and (1) .063" spacer, I'm finding the gap between the spars is around 1.72"-1.73" at each side and top and bottom, compared to the 1.6875" thickness of the wing spars.



If I measure each of the spacers, the actual thickness of the .125" spacers varies from .1264" to .1269", and the .063" ones are a little thicker as well.  These cumulative variations in thickness result in the gap for the wing spars being wider than the spar itself by around .030 to 0.40".  I also noticed that the rivet holes in the bottom of the spar carry-thru sections and the skins is slightly off due to this same issue.



I'm thinking of skipping the included spacers and making my own out of plywood.  Did any other slow-builders run into spacing issues with their spars?



Thanks,

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_________________
Mike Behnke
RV-9A Flying
RV-10 Fuselage
Andover, MN

rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Thu Sep 26, 2013 9:40 am Post subject: Spar Spacers

I don't recall having any problems with the spacers. 



Sent from my iPhone



On Sep 26, 2013, at 1:21 PM, "MTBehnke" <mtbehnke2(at)msn.com> wrote:






I'm working on joining the forward and center fuselage sections.  When I bolted the two spar sections together with the (13) .125" and (1) .063" spacer, I'm finding the gap between the spars is around 1.72"-1.73" at each side and top and bottom, compared to the 1.6875" thickness of the wing spars.



If I measure each of the spacers, the actual thickness of the .125" spacers varies from .1264" to .1269", and the .063" ones are a little thicker as well.  These cumulative variations in thickness result in the gap for the wing spars being wider than the spar itself by around .030 to 0.40".  I also noticed that the rivet holes in the bottom of the spar carry-thru sections and the skins is slightly off due to this same issue.



I'm thinking of skipping the included spacers and making my own out of plywood.  Did any other slow-builders run into spacing issues with their spars?



Thanks,



--------

Mike Behnke

RV-9A Flying

RV-10 Fuselage

Andover, MN





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=409292#409292

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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

wgreenley

Joined: 09 Jan 2010
Posts: 100
Location: Dowagiac, MI

Posted: Thu Sep 26, 2013 10:11 am Post subject: Spar Spacers

The only thing I had to do was deburr the edges of the spacers, otherwise

they did not stack together well.



--

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davidsoutpost(at)comcast.
Guest

Posted: Thu Sep 26, 2013 11:38 am Post subject: Spar Spacers

Make sure your spacers are burr free and clamp them up.  Everything will line up just as they should provided you use the correct spacers supplied by Vans.

From: "MTBehnke" <mtbehnke2(at)msn.com>

To: rv10-list(at)matronics.com

Sent: Thursday, September 26, 2013 1:21:45 PM

Subject: Spar Spacers

--> RV10-List message posted by: "MTBehnke" <mtbehnke2(at)msn.com>

I'm working on joining the forward and center fuselage sections.  When I bolted the two spar sections together with the (13) .125" and (1) .063" spacer, I'm finding the gap between the spars is around 1.72"-1.73" at each side and top and bottom, compared to the 1.6875" thickness of the wing spars.

If I measure each of the spacers, the actual thickness of the .125" spacers varies from .1264" to .1269", and the .063" ones are a little thicker as well.  These cumulative variations in thickness result in the gap for the wing spars being wider than the spar itself by around .030 to 0.40".  I also noticed that the rivet holes in the bottom of the spar carry-thru sections and the skins is slightly off due to this same issue.

I'm thinking of skipping the included spacers and making my own out of plywood.  Did any other slow-builders run into spacing issues with their spars?

Thanks,

--------

Mike Behnke

RV-9A Flying

RV-10 Fuselage

Andover, MN

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=409292#409292

 [quote][b]

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Fri Sep 27, 2013 8:04 am Post subject: Re: Spar Spacers

I ran mine through a belt sander, removing the deformation from machine punching, left .003" clearance and built on. I also used two factory bolts on each side for alignment after greasing them. Hardware bolts leave too much clearance, so just used them to pull everything together tight.

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Wayne G.

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