Great Planes Tracer 46 Kit - GPMA0400 - Manual (Page 11)

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1. From two 1/8" x 3/8" x 30" basswood sticks, cut four
14-1/2" long spar doublers.
Before using the basswood spar doublers and spars,
examine them carefully for possible imperfections. Look
for knots, soft spots, diagonal grain and any other
imperfections. If possible, position each spar doubler so
the imperfections (if any) are on the outer half of the wing
panel (toward the tip), where they will be least affected by
high stress. If the spar doublers are warped slightly, try to
“balance them out” by installing the warped spar doublers
in opposite directions (see sketch).
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2. Sand a 1-1/2" taper on one end of each spar doubler
as shown.
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3. Glue the spar doublers to the four 1/8" x 3/8" x 30"
basswood spars, aligning the untapered end of the spar
doubler flush with the inboard end of the spar. From this
point forward we will refer to this combination as a spar.
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4. Position 2 spars on top of each other with the spar
doublers against one another. Position the other 2 spars
similarly. Sand the inboard end of all four spars to match
the centerline of the wing, labeling each one as you do so.
Note: Make sure you make a bottom left, bottom right,
top left and top right spar. The top spars shown in the
photo have been turned upside-down and the label is
written on the bottom of the spar doubler.
Note: From this point forward, steps which are for
retractable gear installation will be in gray boxes. This will
help clarify which steps are for fixed gear and which are for
retracts. Fixed-gear-only steps will begin “If you will be
installing fixed gear” again for clarification.
RETRACT INSTALLATION
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1a. If you will be building your Tracer with retracts, glue
the four die-cut 1/8 ply rib doublers with two slots to the
pair of die-cut 3/32" balsa ribs 3 and 4, being careful to
make a left and a right rib 3 and 4 as shown in the photo.
Note: Make sure the slots in the rib 3 doublers are the
same direction as the servo tray slots in the ribs 3.
Add the Rib Doublers
Build the Wing Spars
BUILD THE WING
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