High Quality Plan Sets for Radio Control Aircraft
Henry Struck's 1937 Benny Boxcar
Scaled to 108 inch span
Page 12
Initial assembly of the right inner wing panel.
Setting the dihedral angle using the ply center shear web. Add the balsa center shear web to insure proper spar spacing.
Mating the inner wing panels. Support the wing panels on their leading edges against construction triangles pinned to the building board and lengthened with tacked on balsa sticks. Use the center section ply doublers to establish the
dihedral angle with the balsa inner shear web also installed and centered. The upper and lower spars should both butt an the same time. At this point the trailing edges, leading edges, and sub spars will all be over lapping. Find the
place to cut them by lining up a construction square with the main spar join and mark and cut the overlapping parts a shade long. Sand them to a good fit, checking while doing so that the wings have not shifted from their positions.
Another view of checking the cut for the leading edge.
Installing the balsa center shear web.The front ply dihedral brace is temporarly in place to help with alignment.
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