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1. 05:43 PM - Center spar upgrade (chuck960)
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| Subject: | Center spar upgrade |
For those of us who had to shim the front flange of the center spar to get it to
sit up at the correct angle.
I called Zenith and they gave me the ok to trim off the front lower flange before
adding the new doubler flange. I wanted to try this so I could get rid of the
shim. Some others here have expressed concern over the shim but I didn't think
it was much of an issue if done right.
However now I have the opportunity to remove it.
Also the new doubler is the 601 version and again bent to the wrong angle for a
650. Not a problem as it can be unbent a couple of degrees by doing the following.
Today I trimmed off the flange and fitted the doubler drilled and clecoed it and
the spar will sit on the floor at the correct angle and in fact looks very good.
This is a bit tricky but very doable. It involves bending a small piece of aluminum
to form a copy (template) of the doubler but the length can be only an inch
or two. What is important is that the heigth must match the doubler exactly.
Build up the spar with the new parts to a point where it can be clecoed into
the fuselage with the front flange removed. The new spacers must be installed
and the rear uprights in place. Set in the doubler template and tweak the bend
until it sits square on the floor and the spar front. Mark the spar at the
top of the template to later locate the doubler top edge. Remove the spar from
the fuselage. Use the template to fix the new doubler bend angle and fit it to
the spar front using the mark and thats it.
Hope this helps!
Chuck Dean
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=286049#286049
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