Great Planes Spirit 100 Sailplane Kit - GPMA0550 - Manual (Page 20)

ADVANCED WING
ASSEMBLY
D 1. Tape the plan to your flat work surface and cover the
wing drawing with waxed paper. NOTE: If your work space
is limited, you may cut the wing drawings apart from the rest of
the plans.
D 2. The Shaped Wing Leading Edges (SPTlW14) are fastened together.
Cut between the LE'S, with the knife resting against the LE
as a guide. Do not cut vertically at the edge of the LE or it will end
up to narrow. Allow the cut to follow the cross sectional shape
of the LE. Sand away any excess balsa that remains along the
edges using a sanding block with 100-grit sandpaper, but do not
"square off" the edges.
TWO WARPED SPARS INSTALLED
THIS W A Y WILL RESULT IN A
STRAIGHT WING
TWO WARPED SPARS INSTALLED
THIS W A Y WILL RESULT IN A
WARPED WING
D 4. Punch out the two Rib Gauge Pieces (SPT1W22) and
assemble them using CA. Notice that one end of the gauge is
slanted at a 3-1/2 degree angle for positioning the end ribs. The
other 3 ends are perpendicular and can be used to keep parts 90
degrees to the work surface.
BUILD THE INNER WING PANEL
You'll need the following parts:
SPT1W05 1/16" Balsa DC Wing Ribs - W2
SPT1W06 1/8" Balsa DC Wing Ribs - W1, W3
SPT1W07 1/16" Balsa DC Wing Ribs - W4, W6,
W7,W9
SPT1W08 1/16" Balsa DC Wing Ribs - W2A & B,
W5,W8,W10
SPT1W12 1/8" x 3/8" x 30" Basswood Inner Spars
SPT1W14 Shaped Balsa Leading Edge
SPT1W18 3/8" Balsa Notched Inner Sub TE
SPT1W20 1/16" x 3" x 30" Balsa Wing Bottom Sheet
SPT1W22 1/8" Ply DC Clamps and Gauges
SPT1W24 1/16" Balsa Shear Web Pack (26)
D 1. Locate all the SPT1W05, SPT1W06, SPT1W07 and
SPT1W08 die-cut rib sheets. Check to make sure you can read
the embossing on each rib. If you can not, use the die patterns on
page 5 to determine the rib #'s and mark the #'s on the ribs.
Carefully punch out all the die-cut 1/16" Balsa Wing Ribs. Sand
the edges slightly to remove any die-cutting irregularities.
D 3. Before using the 1/8" x 3/8" Basswood Spars, exam-
ine them carefully for possible imperfections. Look for knots,
soft spots, diagonal grain and any other imperfections. If pos-
sible, position each spar so the imperfections are on the outer half
of the wing panel (toward the tip), where they will be least
affected by high stress. If the spars are warped slightly, "balance
them out" by installing the warped spars in opposite directions
(see sketch).
D 2. Son through the three 1/16" x 3" x 30" Balsa Wing
Bottom Sheeting (SPT1W20) and pick out the two sheets that
most closely match each other in weight and grain. These two
sheets will be the bottom sheeting for the inner panels. Check to
make sure the two "bottom" sheets have at least one straight
edge. If not, use a metal straight edge to cut as little as possible
off one long edge to make it straight.
NOTE: Follow the steps with two check boxes
to build the RIGHT wing panel, then repeat
these steps to build the LEFT wing panel.
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