Great Planes Profile 38 - GPMA0487 - Manual (Page 20)

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5. Pin the boom main frame, elevator and rudder
servo tray and the fin frame to your building board over the
boom plan. Glue the F1 and F2 fin frames together.
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6. From the 1/4" x 1/4" x 30" [6mm x 6mm x 762mm]
balsa sticks, cut and glue an upper and lower boom frame
between the boom main frame, servo tray and the fin.
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7. From the 1/4" x 1/2" x 24" [6mm x 13mm x 610mm]
balsa stick, cut and glue the fin trailing edge and lower
brace to the fin frame.
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8. From 1/8" x 1/4" x 24" [3mm x 6mm x 610mm] balsa
sticks, cut and glue diagonal boom braces and fin ribs to
the boom frame.
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9. Glue two of the die-cut 1/8" [3mm] balsa aft fins
(F4) together. Glue the aft fin to the trailing edge of the fin.
Note the direction of the wood grain.
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10. Remove the boom from your building board and
return to step 2 and build the second boom.
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1. Remove the boom from your building board. Use a
bar sander to sand both sides of the boom even.
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2. Position the boom on top of a 1/16" x 3" x 30"
[1.6mm x 76mm x 762mm] balsa sheet. Align the sheet with
the front and top of the boom. Draw a line on the balsa sheet
along the bottom of the boom.
Sheet the Boom
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