The little red pins are used to hold balsa parts together while the glue dries. Or to hold parts in alignment. They can also be used in foam board construction. The vertical stab and rudder are pinned down to make it easier to apply the tape hinge. Hard to do just holding the parts together while applying the tape.
Attractive aircraft in it’s own way, the Aeronca C-1 is from the late 1920’s. It was called the “Flying Bathtub” because the pilot sat directly on the floor of the airplane. Always wanted to build a model of one and thought now might be a good time to come up with a foam board version.
The elevator of the Aeronca has a very narrow connection between the left and right side. If the elevator is being built with balsa and hardwoods there would be no concern about connecting the halves. But foam board does not have the torsional strength of balsa in this application. An exact foam replica from the plan would give a very narrow strip of foam board to connect the halves. So I decided to add a joiner made from 3/16″ x 1/2″ firm balsa. The middle pic shows what that looks like. Next is the need to cut a 45° bevel on the leading edge of the elevator. Normally cutting a bevel in foam board is easy, but with the addition of the balsa joiner the task becomes more challenging. Two possible ways to make a bevel in the balsa. One is to file or sand the bevel in the balsa before gluing it in to the foam board. Another is to use a power tool. I used a Microlux table saw. Just set the fence and make the cut. Comes in very handy.
Currently working on my first foam board scratch build, an Aeronca C-1. Saw this video of a full scale C-3. Thought it would be good to post.
Just started my first scratch build foam board model. Bought plans for an Aeronca C-1 from eBay. Usually when you think of buying model airplane plans you think AMA Plans Service; a very comprehensive assortment. But I found many plans on eBay. Anyway, you get plans, make a copy, cut the drawings out, glue them to poster board to make templates, then trace onto foam board and cut the parts out. Then assemble the model. One way to glue the cutout plans is to use Elmer’s Disappearing Purple School Glue. It is in stick form, like Chapstick. it’s purple to let you see where you are putting it. In a short time the purple disappears. Just started using it but so far it works very well.