.
Tail Surfaces
• Build the fin and stabilizer over the plans. Thoroughly soak the strips which must be bent, in warm water. Then bend to
the correct shape over the plans, holding with lots of pins, close together. Allow to dry before cementing the other pieces
in place.
Wing
• Begin the wing by cutting 4 pieces of 1/16" x 1/8" to the length shown on the plans. Make all 4 exactly the same length
and pin securely to the plans. Then build both wing halves carefully fitted against,
but not cemented to
these 4 center
section pieces. Each completed wing half can be removed from the plans for sandpapering. But
do not move the center
section pieces
.
• You are now ready to fasten the wing panels together. Use small blocks of 1" x 2" lumber, or something similar, to prop
each wing tip 1 1/2" above the plans. Be sure the wings are
not twisted
during this operation. Now lightly cement each
wing half to the ends of all the center section pieces except the one at the leading edge. That one is just for assembly
help - not part of the finished wing. When these joints are dry, cement 2 pieces of 1/16" square into the notches in the top
of the ribs R1. Allow to dry. Now re-glue all center section joints with another coat. Allow to dry completely before lifting
your finished wing from the plans.
Covering
• Cover all structures with light colored Japanese Tissue. Use clear dope to attach paper to the framework at the outside
edges. Rounded surfaces must be covered in small sections. The fuselage covering may be shrunk with water spray and
doped. The wing and tail surfaces are best not sprayed or doped because they may warp and twist. The paper will
tighten over a period of time, anyway, because of changes in the weather. Dark colored tissue trim and plastic windows
are applied to the completely assembled model.
Assembly
• Never cement parts to the tissue covering. Always cut and peel away a small section of tissue to expose the bare wood.
• Cement the fin to the stabilizer as shown. Then cut a slot in the fuselage top covering to let the front half of the fin slide
into the fuselage. Then slide the stabilizer onto the rear of the fuselage and cement.
Do not forget the 1/16" x 1/8" x
1/8" incidence block
under the rear edge of the stabilizer. Note that the front edges of the fin and stabilizer are not
cemented to the fuselage at this time.
• Attach the wing to the fuselage with spots of glue at the intersection of the wing and fuselage members.
• Make 2 sets of wing struts over the plans. Then trim to an exact fit.
Do not twist the wings
by using poorly fitted struts.
Instead, carefully tailor the strut lengths so they hold the wing in an untwisted position.
Windshield And Windows
• Cut out the windshield from clear plastic using the pattern on this sheet. With the front and center of the winshield
approximately in place, tuck the ears of the windshield under the wing and the rounded projections on the front of the
cabin frame. Use large tabs of tape to hold the plastic to the sides of the fuselage. Allow the windshiel to assume a
natural fit. Attach the top edges to the top surface of the wing cutout with narrow strips of Scotch tape.
• Then, one side at a time, cement the plastic to the triangular side window frames only. The plastic is not cemented to the
1/16" square V-struts or the cowling. Trim away extra plastic when the cement is dry.
• Dope Japanese tissue over the window frame cutouts on this sheet and then cut them out. Be sure to make a right and
one left. Cut side windows from clear plastic and carefully cement to the frames. Then neatly cement these assemblies in
place on the fuselage.
• Slide the propeller shaft through the noseblock, bead, and propeller, with rounded boss of the propeller next to the bead.
Bend over the projecting end of the shaft as sharply as possible.
• Tie ends of rubber strand with a square knot. Wet the knot with water before pulling it tight. Hook the rubber band over
the prop shaft, drop the rubber into the fuselage, and slide the dowel throught the loop at the rear end.
Page 3 of 9
Sig Cabinaire SIGFF20 Instruction Manual
