GREAT PLANES Pete'n Poke Sport 40 Instruction Manual page 12

front edge of the skin where indicated by the arrows on the
plan. Pin the skin into position.
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4. Align a straightedge with the tick marks on the plan and
mark the locations of the ribs and spars directly on the skin.
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5. Glue together the die-cut 1/8" plywood and balsa sub
ribs W1-A and W0-A and W1 and W0 as shown on the plan
to make the ribs for the center-section. Be certain you make
a right and left set of ribs that go on the ends of the center-
section. Note that the center ribs consist of a balsa rib
"sandwiched" between two plywood ribs.
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6. Cut a 8-1/2" long center main spar from each of two
3/8" x 1/2" x 36" balsa sticks (the remainder of the sticks will
be used for the bottom main spars in the outer wing panels).
Be certain you accurately cut the spars to a length of 8-1/2"
and that the ends are square.
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7. Glue a center-section main spar to the center-section
sheeting where indicated by the lines you marked.
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8. Cut two 8-1/2"-long center aft spars from each of the
two 1/4" x 1/4" x 36" balsa sticks (the remainder of the sticks
will be used for the bottom aft spars in the outer wing
panels). Fit the three aft center-section ribs to the bottom
center aft spar.
Refer to this photo for the following two steps.
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9. Add the top center aft spar and the die-cut 1/8" plywood
aft wing bolt plate to the ribs. Position but do not glue the
assembly on the center-section sheeting, accurately aligning
the ribs with the marks.
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10. Temporarily place one of the die-cut 1/16" plywood
wing joiners behind the center main spar to act as a
spacer. Push the ribs forward against the joiner. Then, using
a small builder's square to make certain the ribs are vertical,
glue them into position. Do not inadvertently glue the joiner
to the bottom spar or ribs.
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11. Join the three forward center ribs and the die-cut 1/8"
plywood forward wing bolt plate to the assembly. Glue
them into position using a 1/16" ply wing joiner as a spacer.
Be certain the outer forward ribs are in alignment with the
outer aft ribs and be certain they are vertical.
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12. Glue the 1/2" x 2" x 9-1/16" balsa trailing edge block
into position.
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13. Tack-glue leftover 1/4" x 1/2" balsa sticks across the
outer ribs to stabilize the center-section for sanding in the
next step. (You can see the sticks in the following photo.)
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