J-3 Cub Construction Project Session #2
Assembling the J-3
Sides/Adding Bulkheads
I have spent the better part of the day assembling
the two sides, adding cross members, diagonals and bulkheads. The picture
below shows an interim step in the progress with the two central bulkheads
installed, a few aft cross members, and the two sides sanded and glued at the
tail post.
This is later in the day with four side diagonals
glued in and all of the bulkheads installed as shown below. I have removed
excess wood from several of the bulkheads as suggested by Mike MidKiff back
when we went through the kit.
The Cub is a well designed model from a structural
stand point, however, I have several issues with the laser cut parts. (1) The
laser cut software file did not account for the width of the laser cut itself,
so the cut parts are all slightly undersize and the notches are all
oversize. :O< (2) Of course the laser cut is perpendicular to the plane of
the sheet balsa so all part edges are square. However, there are many joints
where the edges of the parts need to beveled to obtain a good fit. If the
edges are sanded with the proper slope, then the part becomes too small. (3)
And then there are the unsightly laser burned edges $#@&. My concern is that
the brownish charring is going to show through the beautiful cub yellow
tissue. Some of the outer edges can be lightly sanded to remove some of the
charring, but many edges are just not accessible. I guess these issues seem
picky to most of you, but I have been a self demanding scratch builder for
many many years and I am picky! However, on this project I decided to just use
the laser cut parts, undersize, burned edges, and all and do the best I can. I
will just have to wait and see how it turns
out....................................Tandy
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