SIG SIGRC80 Rascal C, Instruction Book, Page: 10 / 31

.
Glow Version : Use your hobby knife to
clear out the bottom front sheeting, at
the center front firewall location, to
expose and match the half-circle drain
hole in the bottom nose doubler. Use
your Dremel Tool and a drum sanding
bit to create the half-round shape in the
front of the bottom sheeting, as shown
on the plans. This shape allows the
engine and mount to be more easily
removed and installed.
Electric Version
: In order to mount and remove the motor/gear assembly, you will need access to the bottom front of the
fuselage. As shown, we used a Dremel Tool and a drum sanding bit to shape a rectangular opening in the bottom front
sheeting, with rounded corners. This opening extends back toward the firewall, far enough to allow a screwdriver to fit into
the rear motor mount screw. Use a straight edge and soft pencil to draw the area to be removed directly onto the balsa.
24.
From the laser-cut lite-ply parts, locate the hatch bolt plate. Trim the length of this
piece to fit exactly in place at the bottom of the fuselage, between the longerons,
just in front of former F-5. This part must be positioned so that it is 1/16" below
the bottom edges of the fuselage sides. Use a scrap piece of 1/16" wood to
position it correctly in the fuselage Glue the part in place to the fuselage
longerons and the bottom forward face of F-5.
25.
The bottom access hatch is now made. Locate the lasercut plywood hatch
stiffener, two #2 sheet metal screws and the 1/16"x3" balsa sheeting stock
provided in your kit. Note that the plywood hatch stiffener fits between the
fuselage longerons, just ahead of F-5. The front lip of the hatch stiffener has the
rounded ends. The front of the hatch fits under the plywood landing gear brace
and the rear of the hatch rests on the spruce hatch screw plate just installed.
Start by positioning the ply hatch brace in place in the bottom of the fuselage -
rounded ends beneath the ply landing gear brace and the rear (with the screw
holes) directly over the spruce bolt plate, lined up with the front face of F-5. The
ply hatch cover should fit easily without being forced. If it is a little too wide, lightly
sand its sides to achieve a good fit. Use a sharp pencil to mark a line across the
hatch brace, at the rear edge of the landing gear brace. Remove the hatch brace
from the fuselage. The hatch brace is now sheeted - cross grain - using the 1/16"
balsa stock. At the front, the balsa sheeting is aligned with the pencil mark just
made. Leave about 1/4" of balsa on each side of the brace.
Turn the sheeted hatch over and use a 3/32" dia. drill bit to complete the two
screw holes through the balsa sheet. Turn the hatch back over and use your
Dremel-Tool and a small diameter grinding bit to clear the balsa around the two
holes to accept the heads of the screws. Install the hatch in place into the bottom
of the fuselage. The two guide holes for the hatch screws are now made through
the hatch and the spruce screw plate - do this with a pin vise and a 1/16" dia. drill
bit. The hatch can now be installed into the fuselage, using the two #2 screws
provided.
Use the 1/16"x3" balsa sheet stock to cut, fit and glue cross-grain sheeting in
place from the rear edge of the hatch, back to the center of former F-6. Use your
sanding block to sand the edges of the hatch and bottom sheeting flush with the
fuselage sides.