Let’s get started on the lower wing. Unlike the upper wing, which consists of two outboard panels which are each swept back in relation to a center section, the lower wing is straight (unswept) , but the outer panels still attach to a center section which is built separately. With the upper wing I had to make panel joiner/dihedral brace blocks that set both the sweep and dihedral angles. With the lower wing, a simple plywood doubler with the dihedral angles cut into it does the whole job.
The front and rear spar pieces of the center section are blocked up off the board for alignment, just as I did with the upper wing. The front and rear spar joiners have been cut from a sheet 1/16" plywood supplied as part of the kit
I laminated the dihedral braces to the center section spar segments "in position" on the jig blocks. Clothespin clamps insure a good glue joint.
I lined up each of the four center section ribs in turn using a square and glued them in place. For this job I'm using thin (fast) cyanoacrylate, which permits me to apply the adhesive while the parts are held in position.
As with the upper wing, the trailing edge consists of an upper and lower piece of 1/16″ x 3/4″ balsa. The bottom piece is in place here
- I beveled the rear edge of the upper trailing edge sheet to fit tightly against the rear edge of the lower sheet.
It’s important when joining sheet trailing edge assemblies like this to keep the glue joint straignt. I used scraps of 1/4″ sq. balsa held with clothespin clamps to make sure I got it right.
Here’s the two-piece trailing edge all glued up. At this point I’ll put the center section aside and work on the outboard wing panels.