Great Planes Old Timer 40 Kit - GPMA0495 - Manual (Page 17)

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10. Use a Great Planes Power Plane ™ and sanding bar
to shape the LE to the shape shown on the wing plan.
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11. Use the Power Plane and sanding bar to shape the
TE to the shape shown on the wing plan.
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12. Use a hobby knife to carefully cut a slot in the root
ribs W4 and ribs W3 to allow the die-cut 1/8" [3.2mm]
plywood wing joiner to be inserted. Set the center-section
off to the side.
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1. Cover the left wing panel plan from W-4 to the wing
tip with waxed paper or Great Planes Plan Protector. Note:
The outer wing panel will first be assembled without glue.
Then, in step 9, the wing panel will be glued together.
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2. Match two of the 3/16" x 3/8" x 30" [4.8mm x 9.5mm
x 762mm] basswood main spars so any warps will
counteract each other.
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3. Position one of the main spars over the plan and pin
it to the building board. Because the wing uses a center
shear web the main spar can only be pinned outboard of the
W4 and W10 ribs.
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4. Position the die-cut 3/32" [2.4mm] balsa ribs W5
through W10 and the die-cut 3-ply rib W4 over the main
spar, perpendicular to the building board. Slide the die-cut
1/8" [3.2mm] balsa outer wing panel shear web over the
ribs. Use the die-cut 3-ply dihedral gauge to set the angle of
rib W4.
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5. Install the 3/16" x 3/8" x 30" [4.8mm x 9.5mm x
762mm] basswood top main spar. Pin the wing ribs in
position over the plan, making sure that the bottom of the
ribs are against the building board.
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6. Glue the die-cut 3/32" [2.4mm] balsa rib doubler
W5A to the aft outboard side of rib W5.
Build the Left Wing Panel
BUILD THE OUTER WING PANELS
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