SIG Four-Star 120, Инструкция по сборке и управлению

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66. Temporarily tape the elevators to the back of the stabilizer, then use a sanding block to sand both of them at the tips until
they match perfectly. The tips can be left square or sanded round if you prefer.
Fin and Rudder
67.
a. Cut the 1/4"x3/4" balsa fin trailing edge to length and pin it in place over the
plan. Notice that the fin trailing edge extends to the bottom of the fuselage.
b. Cut the fin base from the remaining piece of 1/4"x2" balsa sheet. and then
pin it in place over the plan.
c. Add the 1/4"x3/4" balsa leading edge and top piece.
d. Add the 1/4" sq. balsa diagonals to complete the fin frame.
68.
Cut a piece of 1/16"x4"x30" balsa as shown in the diagram, and glue the parts
together to make two fin skins. Use Sig-Bond for gluing the sheets, and sand the
joints smooth BEFORE attaching them to the fin frame.
69.
a. Sand both sides of the fin frame smooth with a large sanding block. Trim
the ends of the fin leading and trailing edges to their final shape.
b. Draw a line on both sides of the fin trailing edge 3/8" below the fin base.
c. Apply slow CA or Sig-Bond to one entire side of the fin frame except for the
area below the line that you have just drawn.
d. Repeat the above step for the other side of the fin.
70.
When dry, trim the sheeting flush with the fin frame. Use a sanding block to sand
the fin leading edge round. Finish the fin by sanding a small flat spot at the bottom
of the leading edge to fit against former F-6. Temporarily pin or tape the stabilizer
to the fuselage, then trial fit the fin in place. You may have to trim the length of the
fin trailing edge to allow the fin base to seat firmly on top of the stabilizer. Leave
the fin in place until after the tailwheel has been fitted.
71.
a. Round off the trailing edge and bottom of the pre-cut 3/8" balsa rudder, and
bevel the leading edge.
b. Imbed the die-cut 1/16" plywood rudder horn support (RHS) in the right
side of the rudder. Drill the two mounting holes for the rudder control horn,
and reinforce the balsa around the holes with thin CA.
c. Cut a slot in the bottom edge of the rudder to accept the tailwheel wire.