2
Wings
The wing joining system for this model consists of a steel joiner bar and a brass joiner box.
The steel joiner bar is permanently glued into one wing, while the brass joiner box is
permanently glued into the other wing, see Figure 1.
Blank-off one end of the brass box with a flat piece of fibreglass soaked in resin. When
completely cured and dry insert the steel joiner into the brass box and trial fit them into the
wing spars. The brass box should be fully inserted into one wing while the steel joiner should
be half inserted into the brass box, see Figure 1. Position one wing half flat on a building
board and apply 50mm dihedral at the tip of the other half. The wings have been already
sanded to the correct dihedral. Pieces of balsa, books etc can be used to hold the required
dihedral. It might be necessary to file the bottom of the steel joiner in order to achieve the
required dihedral. Separate the wings and remove the steel bar and brass box. Sand the
entire outside surface of the brass box and one half of the steel joiner (the one outside the
brass box).
Figure 1
Lay down a piece of wax paper to protect your building board. Smear a small amount of 5min
epoxy at the bottom of the assembled brass box and steel joiner and insert them into the
wings. Using masking tape hold the two wing halves together (with 50mm dihedral), making
sure that both halves match each other. Be careful not to glue the wings together. Allow the
epoxy to cure.
Once cured, gently move both wing halves apart. You now need to fill the voids in the wing
spars with epoxy. Use slow curing epoxy (minimum 1 hour) in order to achieve a good
penetration and strength. Position the wing halves vertically and fill the voids with epoxy
using a syringe. Allow the epoxy to cure completely.
