Golden Era Model Service
High Quality Plan Sets for Radio Control Aircraft
Henry Struck's 1937 Benny Boxcar in 47 inch span

The trailing edges have been made up, with slots for the ribs.  Both are made at the same time so that the left and right slot pairs are cut in one pass. 
If the trailing edge parts are placed on the edge of the work table it is easy to sand in the taper.  Use lightweight balsa.  Pre-made trailing edge stock is usually
harder and heavier than it needs to be and is never just the right shape.  The wing tip bows are made from two layers of 1/16 balsa to ease the curve.
 The ribs will support the wing tip parts while you tack them lightly in place with thin CA. The lower center part is installed last and then thin CA is 
run in from the edges for final gluing.

Another view of the partially assembled wing, with the upper rear spar and leading edge installed.  On the prototype the slots
for the rear spars were cut too deep but that has been corrected on the laser cut parts.

Joining the wing.  There are lines on the plan for dihedral angle.  Align the wing panels over the plan, supporting them with triangles in four places.  The rib locations are
indicated on the plan.  Fit the leading edge first, then intall the two 1/8 balsa center wing joiner parts using aliphatic glue or epoxy to allow some time
for alignment.  When cured sand the bottom join of the lower spars off flat and install the spruce splice part using epoxy.  Then install the 1/16
ply splice plates using 30 minute epoxy.  Sand in the fit of the trailing edges using a triangle to locate the proper center location.

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