GREAT PLANES Waco YMF-5 Instruction Manual page 11

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11. Two joiners are needed to join the top left wing to the
center wing section and two joiners are needed to join the
right wing to the center section. Scuff and clean the aluminum
joiner the same as was done for the bottom wing. Mix up a
batch of 30-minute epoxy and glue each 235mm x 15mm
aluminum L.E. joiner to a matching ply joiner. Be careful when
matching the dihedral angle of the joiners when you're gluing
them together because the angle is very shallow. Clamp
these together and allow the epoxy to cure.
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12. Glue a pair of 125mm x 13mm plywood T.E. wing
joiners together. Then, glue the remaining pair of 125mm x
13mm ply joiners to each other. Clamp these together and
allow the epoxy to cure.
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13. Apply some epoxy into the L.E. and T.E. joiner slots of
both the right wing and the right side of the center section.
Coat the joiners with epoxy. Then, fit the long L.E. joiner
into the leading edge slot and the short T.E. joiner into the
trailing edge slot. Coat the root ribs of the right wing and
the right side of the center section and join the right wing to
the center section. Make sure you orient the joiners correctly
with the dihedral angle upright. Note: To protect the servo
lead contacts, wrap the connector in masking tape.
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14. Do the same for the left wing, coating the joiners and
ribs with epoxy. When you're ready to slide the left wing onto
the center section, route the servo lead through the root rib
of the center section and out of the exit hole.
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15. Slide the wings together tightly. Hold them together
using masking tape. Stretch one long piece across the span
so the ends wrap around the wing tips. Do this for the top
and the bottom side of the wing to ensure that the tape does
not slip.
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16. Clean up any excess epoxy with denatured alcohol
and paper towels. Set the wing aside and let the epoxy cure.
Carefully remove the masking tape.
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