GREAT PLANES Profile 38 Instruction Manual page 21

3. Use a straightedge to trim the sheet along the line
through the end of the sheet.
4. Check the fit of the sheet on the boom. Make sure
the sheet is flush with the top and bottom of the wing. With
the boom and balsa sheet flat on your building board, use
medium CA to glue the sheet to the boom.
5. Use a piece of leftover 1/16" [1.6mm] balsa sheet
from the wing to finish the aft sheeting. The sheet should
align with the trailing edge of the fin.
6. From a second 1/16" x 3" x 30" [1.6mm x 76mm x
762mm] balsa sheet, finish sheeting the bottom of the
boom. Trim the sheet around the outside of the boom.
7. Using a sharp hobby knife, trim the sheeting from
inside the engine mount area, the servo tray and the
stabilizer saddle.
8. Trim the wing saddle as shown. Note that the sides
are straight with the sheeting overhanging the boom. Also
trim the sheeting from over the two mounting tabs.
9. Repeat the process to sheet the other side of the boom.
10. Return to step 2 and sheet both sides of the other boom.
11. Glue two of the die-cut 3-ply upper booms together.
12. Pin the upper boom to the plan. Trim and glue a
leftover 1/4" x 1/4" [6mm x 6mm] balsa stick to the top of the
upper boom.
21