Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 34)

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18. Refer to the Expert Tip that follows, then use the
narrow sheets you just cut to sheet the wing tips over
the R2 tip ribs between the spar and the trailing edge.
The sheet should extend past the inboard R2 rib by
approximately 1/8".
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19. Use the wide pieces you cut to sheet the center
section of the wing the same way as the tips. You will have
to “custom fit” the edges of the sheeting where they meet
because of the curvature and dihedral of the wing. Arrange
the weights so you add one side of sheeting at a time.
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20. Finally you can take the weights off the wing and
carefully remove those wing jigs. If you are building the
wing for bolt-on attachment, use epoxy to glue in the wing
dowel you cut earlier.
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25. Use four of the narrow sheets to sheet the bottom of
the wing tips as you did the top of the wing tips.
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23. Use your ballpoint pen and a drafting triangle to
accurately mark and cut the last 1/16" x 3" x 30" balsa
sheet into four 2-5/8" wide sheets and four 4-15/16" wide
sheets. The 2-5/8" sheets will be used to sheet the
bottom of the wing tips and the 4-15/16" sheets will be
used to sheet the
bottom of the center section.
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24. Find the 1/16" x 3" x 15" sheet – it should be the
last piece of sheeting in the box – to cut one more 2-5/8"
wide strip and one 4-15/16" wide strip.
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21. Use your ballpoint pen and a drafting triangle to
accurately mark and cut the last 3/32" x 3" x 30" balsa
sheet into four 2-5/8" wide sheets and four 4-7/8" wide
sheets. The 2-5/8" sheets will be used to sheet the
bottom of the wing tips and the 4-7/8" sheets will be
used to sheet the
bottom of the center section.
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22. Find the 3/32" x 3" x 15" sheet – it should be the
last piece of sheeting in the box – to cut one more 2-5/8"
wide strip and one 4-7/8" wide strip.
EXPERT TIP EXPERT TIP EXPERT TIP
Use a ballpoint pen and a drafting triangle or a building
square to
accurately mark one of the remaining 1/16" x
3" x 30" sheets, dividing it into four 2-5/8" wide sheets
and four 4-7/8" wide sheets. Use the square to keep the
ends of the sheets perpendicular to the edges. Cut the
sheets into sections along the lines you marked with a
hobby knife and a straightedge. The 2-5/8" sheets are
used to sheet the
top of the wing tips and the 4-7/8"
sheets are used to sheet the top of the center section.
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THIS STEP FOR PT-20 MK II ONLY
Instead of individually gluing the two sheets to the wing
tip, glue them together on your work table first (over a
piece of waxed paper). Sand off the glue seam and true
the inboard edge of the sheet with your bar sander. Test
fit, trim, then glue the sheet to the tip.
STEP 21 & 22 FOR PT-40 MK II ONLY
STEP 23 & 24 FOR PT-20 MK II ONLY