Sailplane Construction Project Session #109
In Report No. 104a, the wing's inner panel
dihedral was specified with a 10" rise at the tip of the wing's tip panel.
This was used to calculate the 3.37" rise of the inner panel at the
polyhedral break and a dihedral angle of 9.71 degrees.
The 3.37" rise of the wing's inner panel must to
be relative to a straight line between the bottom of the leading and
trailing edge joints at the polyhedral break. Therefore, a support jig was
made and clamped to two steel building blocks as shown below.
From the work table up to the top edge of the top
rail was made exactly 3.37" as shown below.
This support jig was positioned under the wing's
polyhedral break as shown below.
As a check, the height of the tip panel was
measured as shown below. Would you believe it measured 10" right on the
The dihedral angle of 9.71 degrees was divided by
to get 4.86 degrees The leading and trailing edges of both the inner panels
are beveled at 4.86 degrees. As a check, one end of the leading edge of the
wing's center section was beveled at 4.86 degrees and placed up against the
end of the inner panel leading edge. The leading edge fit was as it should
be as shown below. The bevel angle is correct. I will now proceed with
building the wing's center section....................Tandy
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