© 2008 Stevens AeroModel.
Page 26 of 52
9.
Dry fit the second 18-1/4 in. length of carbon flat stock spar to the upper set of notches forward of the spar web
spanning ribs R1 through R2b. Remove, trim, and re-install as required to fit carbon properly. Square
assembly to building board and make certain that carbon strip is completely seated within notched portion of rib
(the strip will seat flush with the top edge of the center spar cap). Retain strip by placing a drop of thin CA glue
at each point where the carbon spar passes through the notched rib.
10. Fit 3/32 in. balsa ribs R3 and R4 (sheet 06/21) and 1/16 in. balsa sub ribs R3a, R3b, and R4a (sheet2/21) to
wing assembly as illustrated below. Use the plan set as a guide for proper rib placement. Square ribs to wing
spar and flat building board then retain by tack gluing at tab and notch locations. Note that R4b is not installed
in this step and will be dealt with later in the assembly.
11. Install upper spar cap S5 (previously assembled in step 1) to wing assembly as illustrated below. Retain part by
tack gluing at tab and notch locations.