Build The Dummy Engines - GREAT PLANES Piper j-3 cub Instruction Manual

4. Make the "Shocks" by drilling a 3/32" hole through the
middle of a 5/16" x 5/16" x 1-1/4" long piece of balsa. Use
your hobby knife to carve a few irregular slices out of the
square pieces. Slide them onto the lower wire and glue them
in place about 1" below the bend in the wire. Cover them
with a piece of 3/8" diameter. black heat shrink tubing and
shrink it tightly around the shocks.
5. Use small rubber bands or small pieces of heat shrink
tubing to attach the suspension to the landing gear struts.
Use another piece of rubber band to hold the lower wire to
the upper wire. A drop of CA will hold it in place. We do not
recommend permanently attaching the suspension, as it will
get caught in tall grass and flip the plane over on take-offs
and landings.
Building the Dummy Engines
NOTE: Notice that there is a right and a left dummy
engine. If you installed your engine inverted and the
muffler is not in the way, you can install both a right and
a left dummy engine.
1. Cut the molded ABS Dummy Cylinder (CUB4F23) out
along the molded in trim line. Sand the edge smooth. Paint
the cylinders flat black and the valve covers aluminum. We
used Testor's plastic model paint, which worked well.
2. Cut the Engine Shroud out along the trim line and
sand its edges smooth. Test fit the shroud in place on the
cylinders as shown in the next photo. Trim and sand as
required for a good fit. Paint both the inside and the outside
of the shroud flat black.
3. Glue the shroud to the dummy cylinders with CA. It is
a good idea to make scratch marks or poke holes on the
dummy cylinder in the area where the shroud will be
attached. This will help the glue adhere.
4. Using a hobby knife and sandpaper remove the paint
from the cowl in the area that the dummy engine mounts.
Glue the dummy engine to the cowl in the approximate
location shown in the photo and on the plans. A simple
"exhaust system" can be added using 3/16" diameter rubber
vacuum tubing and scrap wire (see photo on box cover).
Drill holes in each of the cylinders and in the cowl to insert
the wires in. The decal sheet includes "Continental" decals
which can be added to each valve cover.
41