Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 26)

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24. Test fit the belly pan side doublers and the belly
pan former (BPF). Glue them in position with medium CA.
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25. Remove the wing and use your bar sander to bevel
the top of FBP-A so it is flush with the fuse bottom. Bolt the
wing back onto the fuselage.
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26. Glue the belly pan bottom in position with medium CA.
Hint: fuelproof the wing bolt area and the under side of the
belly pan bottom before gluing it into position.
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27. While the wing is still in position, use medium or thick
CA to glue the 3/16" balsa wing root spacers to the wing.
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28. If needed, apply filler to the gap between the wing
root spacers and the wing.
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29. Remove the wing from the fuselage. You will have to
break loose the wing root spacers as they were tack glued
to the fuselage. After the filler has fully dried, sand the
spacers and the filler to match the contour of the wing.
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30. Fill the center section of the wing aft of DP on the
top and bottom with 3/32" leftover balsa. Sand the filler
pieces to match the contour of the wing.
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1. Use epoxy to glue the die-cut 1/8" plywood forward fuse
bottom in position with the punch marks facing outward.
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2. Drill a 3/32" hole through both punch marks in the
forward fuse bottom and the LG plates.
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3. Install 8-32 blind nuts supplied with this kit into the
LG plates from inside the fuselage.
Hint: Draw the blind nuts into the LG plates by placing a
large washer on one of the 8-32 x 3/4" socket head cap
screws and tighten the screw. Remove the screw and apply
thin CA around the nuts to permanently hold them in place.
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4. Use your bar sander to bevel the edges of the
fuselage sides, aft and forward bottom and the belly pan
sides and bottom.
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5. From the 3/32" x 3" x 30" balsa sheet make two 1-1/2" x
19-1/2" chine sheets and two 1-1/2" x 10-1/2" chine sheets.
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6. Place one of the 19-1/2" chine sheets on the aft
fuselage bottom “corner” and glue it to the fuse bottom and
side with thin CA from the inside.
Hint: First “prime” the inside of the sheet with CA accelerator
so the thin CA will cure immediately. Glue the balsa sheet
first to the fuselage side, then to the bottom.
Finish the Bottom of the Fuselage
26