Sailplane Construction Project Session #105
Comet Sailplane Project
The wing's left tip panel was jigged up to
the inner panel with a rise of 4-3/8" and the leading and trailing edge joints
were glued first and let dry. The wing half was removed from the work
table. Elmer Carpenter's aliphatic glue was then worked down in between the
four spar overlaps, one at a time, and clamped to let dry. Once the four
overlaps had dried, the rise in the tip panel was again checked as shown
This close up shows that the tip panel was
elevated 4-3/8" as required.
The four glued spar overlaps are shown below
before they were trimmed. Noticed that the leading edge of the inner panel
has been spliced just before the polyhedral joint. The 5/16" sheet stock I
cut the leading edge from was not quite long enough.
This leading edge splice was reinforced with a
1/32" plywood doubler as shown below.
After trimming the spar overlaps and gluing in
the leading and trailing edge doublers, the 1/8" polyhedral joint rib was
fitted and glued in place. Then the last two joint diagonals were added to
complete the continuous semi-span Warren Truss. The picture below shows a top
view of the completed polyhedral joint. Final shaping and sanding of
the leading and trailing edges have yet to be done.
This is a second view of the completed polyhedral
joint from the bottom.................Tandy
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