10
Pin the spar to the drawing with 1/64 inch
(.4mm) spacers underneath as shown in
Figure 1.5. The wing ribs fit in spar slots.
When gluing, be sure the rear ribs touch the
building surface at the trailing edge and the
front ribs do so at the lowest point on the
leading edge. Do not worry that the ribs do
not reach all the way to the trailing edge on
the drawing. The cap strips will make up
this difference.
3.
Wing Tips
The tip rib assembly is made up of three laser cut parts: the Tip Rib (WW5), Tip Rib Doubler
(WW6) and Wing Tip (WW7); and some custom fit Tip Braces as shown in Figure 1.6. First,
glue the Doubler (WW6) to the Tip Rib (WW5) and these to the end of the spar. Then, glue the
Wing Tip (WW7) to the Tip Rib, warping it as shown in the figure and on Sheet C. A simple way
to do this is to glue the front quarter first, and after it dries pull the tip down carefully and glue it
in place. Add the Tip Braces cut form 1/32 x 1/8 inch (.8 x 3 mm) stock as shown.
Figure 1.6 Wing Tip Details
4.
Leading Edge
The leading edge (WW8) is made from 1/64 inch (.4mm) laser cut plywood. The actual Dr1
had a warped plywood leading edge as is used here. To prepare each leading edge (six in all
for the three wings) first make a jig from the supplied piece 1/4 x 3/4 inch (6 x 18mm) basswood,
a 3/16 inch (5mm) rod and some scrap 1/64 inch (.4mm) material. Glue together as shown in
Figure 1.7 leaving a 1/64 x 1/8 inch (.4 x 3.2mm) slot as shown to hold the bottom of the leading
edge. Then each leading edge can be formed by soaking the blank for at least ½ hour in water
then slipping the straight edge of the blank in the slot and slowly working the Sheet around the
bar, carefully bending it and clamping with clothes pins or small clamps as shown in Figure 1.8.
Alternately, you can take two pieces of wood, 9” long to bridge the entire length of the leading
edge and clamp these to get a more even pressure. Be very careful forming the plywood and
work it around the rod slowly or it may break. Rolling it on the work surface is also helpful.
Figure 1.5 Building the Wing Detail