SIG Four-Star 20EP, Инструкция по эксплуатации, Страница: 9 / 26

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22. Drill the center of the leading edge with a 1/4" dia. drill bit until the 1/4"x1-1/2" hardwood dowel can be slid into place in the
notches in the W-1 ribs. The dowel should end up protruding about 5/16" out front of the leading edge. When satisfied with
the fit, glue the dowel in place.
23a.
Locate the laser-cut plywood WBP Wing Bolt Plate. Glue it in position on the bottom of the wing. Make sure it is centered
over the joint of the wing panels, and that the back edge of WBP is flush with the back edge of the wing.
b.
Use a 3/16" dia. drill bit to drill completely through the wing in the center of WBP. Be sure to use a "backing block" of some
kind to support the top wing sheeting as you drill through. Cosmetic Note: for better final appearance, and to make it a little
easier to apply the covering material, we like to bevel the edges of WBP as shown here. Bevel the edges before gluing
WBP on the wing.
24.
Remove the 3/16" balsa Ailerons from laser-cut sheet no. 7. Shape the leading and trailing edges of the Ailerons to the
shape shown on the CROSS-SECTION AT W-4 drawing on the plan - round the trailing edges, and "v" shape the leading
edges. When finished sanding, set the Ailerons aside for now. We will hinge them to the back of the wing after all the parts
are covered.
TAIL SURFACES
Begin by taping or pinning the Stabilizer and Elevator plan to your building board. Cover the plan with a layer of waxed
paper to keep glue from sticking to the plan.
25a.
Assemble stabilizer parts S-1, S-2, S-3,
S-4, S-5, and S-9 together over the plan.
Glue the parts together where they join.
b.
Add the stabilizer ribs S-6, S-7, and S-8.
c.
When dry, unpin the stabilizer from plan
and sand it to final shape. Round the
leading edges. Leave the trailing edge
and the tips square.
27a.
Assemble and glue the elevator parts together over the plan, just like you did the
stabilizer.
b.
When dry, remove the elevators from the plan and make a couple light passes on
the top and bottom surfaces with your large sanding block to smooth them out.
c.
Sand the trailing edges of both elevators round, as shown in the cross-section
drawing of the elevator on the fuselage side view plan. Leave the tips of the
elevators square.
28a.
Draw a hinge line all the way down the middle of the leading edge of each elevator. Make sure it is centered.
b.
Lay the elevators in position up against the trailing edge of the stabilizer, making sure to have the tips lined up. Then lay the
1/16" Wire Joiner in position and mark its location on the elevators.
c.
Use a 1/16" dia. drill bit to drill a hole in the leading edge of the elevators to accept the leg of the Wire Joiner.