Dynaflite PT-19 - Manual (Page 12)

31. Glue the 1/4" x 1/2" x 42" balsa stringers
to the fuselage sides.
Set the fuselage aside until later. It will be completed
after the wing and stabilizer are built.
If you have not done so already, now is a good time
to obtain a mount for your engine. If you will be
using a two or four stroke engine a Great Planes
60-120 mount (GPMG1091) will work well. If you
will be using a chainsaw type engine you will
probably need a spacer behind the mount.
3. Pin the 1 /4" x 3/8" x 42" basswood lower
spar over the plan.
4. Pin the 3/8" x 1/2" x 42" balsa stick on
the dashed lines called "shim stick." This will hold
the rear of the ribs at the proper angle until there are
enough pieces to hold the wing rigid.
5. Punch the ribs from their die-cut sheets,
sanding the backs lightly if they do not come out
easily. Number each rib as you do so; don't forget to
number the aileron ribs as well. Check the fit of the
spar to the spar notches in each rib.
1. Lay the RIGHT WING PLAN on your
building board and cover it with wax paper.
2. Prepare a leading edge skin. Locate one
piece of 3/32" x 3" x 42" balsa sheet and one piece
of 3/32" x 3" x 36" balsa sheet. Join them together
so that the ends are even with each other on one side.
Form a skin using your favorite method (we use
masking tape to form a hinge and then join them with
aliphatic resin glue). Sand the best side smooth with
150-grit sandpaper. Position the skin on the plan
aligning the aft edge with the center of the spar. Mark
the front of the leading edge on the skin at the root rib
(W1) and the tip rib (W11). Use a long straightedge
to trim the excess sheeting from the skin. Leave 1/4"
extra to allow for the curvature of the ribs. Set this skin
aside for use later. Save the piece that was trimmed
off for the other wing panel and use it in place of the
second 3/32" x 3" x 26" sheet.
6. Glue the 1/8" die-cut ply landing gear
doublers to ribs W2, W3 and W4 using 30-minute
epoxy. Glue them to the sides shown on the plans.
There are two doublers for W2. The one with the
long cutout is glued to the side facing the wing tip.
This cutout will lock in the landing gear stub (torque)
block. Check the fit of the landing gear block and
stub block in their cutouts.
12