Cover the model in sections, starting with the tail and moving forward.
The main gear doors have been added. They
are mounted to the wing with a large hinge.
The belly pan has been “in-filled” to allow
cutouts for the wing mounting bolts.
The 1/16-inch wire connects the strut to
the door. The wire slides into Du-Bro micro
connectors attached to the door. You can also
see the curve of the door.
The prototype was painted with rattle-can paint in several shades of
silver. The panel lines were done with a pen and the dirt/exhaust was
airbrushed. The decals are from Callie Graphics.
the top. Cut out the wheel well area.
Remove some of the sheeting on the
wing’s center section for wing mounting
plate 2. Test fit the wing to the fuselage.
When you are satisfied with the fit
and alignment, mark and remove the
sheeting on the bottom of the wing
for the two forward bolts. Block in
around this area with scrap balsa. Drill
four holes for the 1/4-inch nylon wing
After the wing is mounted to the
fuselage, use the templates to make
and add the outer LE center (inner and
outer) from 1/8-inch balsa. Add 1/2-inch
balsa triangle stock for the outer section
of the LE edge, glue on the wingtips, and
contour all of the pieces to shape. Add
the intake parts and block in behind the
intake with scrap balsa and contour.
Glue the belly pan into place, add
additional stringers, and fill in as needed.
Cut the ailerons free and contour
the aileron’s LE to shape. Hinge as
desired. (CA hinges were used on the
prototype.) Mount the aileron servo.
The prototype used Coverite
Microlite and the surface was lightly
scuffed with fine-grit sandpaper to allow
the paint to better adhere. After the
model is covered, use the templates to
make the exhaust ducting, tail wheel
cover, and fin fairing from cardstock and
paint or glue them into place. Trim and
glue the canopy in place and add cockpit
detail as desired. Mount the motor and
the remaining electronics.
The gear doors were made with the
templates provided on the plans. They
are a lamination of .03 plastic and 1/32-
inch plywood. Full construction details
can be found in the manual.
Du-Bro 257 heavy-duty pinned hinges
connected the top of the door to the
wing. Attach one half of the hinge to the
door and the other half can be mounted
to the retract plate or the retract itself.
The bottom half of the door is attached
with wire to the strut. Two Du-Bro
Micro E-Z connectors were used on the
door to retain the wire from the strut.
Balance the model according to the
plans. The prototype flew with the
following control surface deflections:
aileron +/- 3/4 inch; elevator +/- 5/8 inch;
and rudder +/- 3/4 inch.
Before flying, thoroughly check the
model to ensure that all of the control
surfaces are moving in the correct
direction and the gear smoothly retracts
and extends. Test the powerplant and
perform a taxi test to check for proper
tracking and adjust as needed. Takeoffs
are fairly straightforward. The wide gear
helps with ground handling.
cruises well at half
throttle with the
and loops are
and the stalls are gentle—the nose
lowers and one wing drops, but does
not snap. Recovery is standard for stalls.
Landings are as expected as well. Power
is kept on throughout the approach,
gradually reducing to achieve the glide
slope. The large propeller causes plenty
of drag, so some power is needed until
the wheels touch.
Many thanks to Joe Balabon for
the in-flight photos. I hope you enjoy
building and flying your Fun Scale
Bearcat. Happy landings!
RCGroups build thread
Manzano Laser Works
Park Flyer Plastics
40 Model Aviation APRIL 2017 www.ModelAviation.com