GREAT PLANES RV-4 Instruction Manual page 28

42. Locate the die-cut 1/8" [3mm] balsa formers F7A,
F6A, F5A, F4A F3A and F2A. Glue them in place at the
location and angles as shown on the plan.
43. Locate the die-cut 1/8" [3mm] plywood fuel tank right
cover (FRC) and fuel tank left cover (FLC). Glue the fuel
tank right cover into the notches in F2A and F1A on the right
side of the fuselage and glue the fuel tank left cover into the
notches in F2A and F1A on the left side of the fuselage.
44. From a leftover piece of 1/8" [3mm] plywood, cut a
piece 1/2" x 3" [13 x 76mm]. Draw a center line across the
length of this piece.
45. Locate the die-cut 1/8" [3mm] plywood fuel tank top
cover (FTC). Trial fit the fuel tank cover into the notches in
FRC, FLC and the firewall. When satisfied with the fit, remove
FTC and glue the 1/8" x 1/2" x 3" [3 x 13 x 76mm] plywood
piece (from the previous step) to the bottom of the fuel tank
cover using the line as the reference for gluing it to FTC.
46. Place FTC back into the notches in FRC, FLC and the
firewall. The tab that you have glued to the botom of FTC
should fit under the opening in F2-A.
47. When you are satisfied with the fit make a mark on the
center of the tab on the front of FTC and center it over the
1/4" [6mm] firewall. Drill a 1/16" [1.6mm] hole on this mark
through FTC and the firewall. Hold the FTC in place with a
#2 x 5/8" [15.9mm] sheet metal screw and a #2 washer.
48. Locate the 1/8" x 1/4" x 24" [3 x 6 x 610mm] basswood
turtledeck stringer. Cut it to fit on top of formers F2A
through F4A. Cut the remaining piece to fit on top of formers
F5A through F7A.
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