Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 17)

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9. From the 3/32" x 1/4" x 24" balsa sticks cut cap strips,
then use medium CA to glue them to the tops of all the ribs
of both wing panels.
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10. Remove the weights from the wing then flip it over.
Use your hobby knife and a bar sander to remove the
bottom jig tabs.
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11. Use the 18-3/4" balsa sheet left over from step 7 to
sheet the front portion of the bottom center section. Use your
pattern to cut the curve at each end.
Note: Although the wing does have dihedral, it is minimal so
you can still sheet the front and middle center sections with
two sheets of balsa. This eliminates a glue joint in the center
of the wing and adds strength. It also eliminates the need for
glass cloth.
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12. Use the remaining approximately 15" long balsa
sheet left over from step 8 to sheet the middle portion of the
bottom center section the same way you did the top.
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13. From the five sheets of 3/32" x 3" x 24" balsa
supplied with the kit, select the softest and clearest sheet.
Reserve this sheet for the turtle deck sheeting on the
fuselage and separate it from the others.
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14. Cut a 3/32" x 3" x 24" balsa sheet into two 1-1/2" x
12" sheets and four 1-1/2" x 6" sheets.
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15. Fit, then glue the four 1-1/2" x 6" sheets to the aft
portion of the top and bottom center section of the wing.
Save the two 1-1/2" x 12" sheets for the wing belly pan
which will be built after the wing is mounted to the fuse.
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16. From the 3/32" x 1/4" x 24" balsa sticks cut cap
strips, then use medium CA to glue them to the bottoms of
all the ribs of both wing panels. Fill the small space behind
the servo tray with leftover 3/32" balsa.
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1. Bevel the ends of the tapered, grooved balsa center
trailing edges so they join as shown on the plans. Test fit
the center TE's on the wing.
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2. Place the center TE's over the wing plan and mark the
location of the aileron torque rods. Cut notches at the
marks to clear the torque rods. Test fit the torque rods to
make sure the notches allow enough clearance.
Build the Ailerons
24"
3"
1-1/2" x 12" 1-1/2" x 6"
17