Great-planes Spectra Electric Sailplane Kit - GPMA0540 User Manual download pdf (Page 10)

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 (SPRTW10) are

fastened together by thin strips of balsa. Separate them by

carefully cutting between the LE'S. Sand away the excess

balsa that remains along the edges after cutting them apart,

using a sanding block with 100-grit sandpaper. Be careful

when cutting and sanding to follow the contour of the LE'S

and don't sand any more than necessary, otherwise they

may not match up with the ribs and sheeting.

D 3. Before using the 1/8" x 5/16" x 23-1/2" Basswood

Spars (SPRTW13), examine them carefully for possible

imperfections. Look for knots, soft spots, diagonal grain and

any other imperfections. If possible, 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).

TWO WARPED SPARS INSTALLED

THIS WAY WILL RESULT IN A

STRAIGHT WING

TWO WARPED SPARS INSTALLED

THIS WAY WILL RESULT IN A

WARPED WING

D 4. Carefully punch out all the die-cut 1/16" Balsa W2

and W2S Wing Ribs. Sand the edges slightly to remove any

die-cutting irregularities. The W2S ribs have a die-cut notch

to clear the spoilers in the SPIRIT kit and are not used in this

kit so just treat them like a W2 rib and do not punch out the

notch.

NOTE: The spars may be cut slightly too long. The excess

will be cut off later.

T-Pins

Work Surface

Spar

DD 7. Place the seven W-2 ribs (from SPRTW02 and

SPRTW03) and the two W-2S ribs (from SPRTW02) on the

spar in their approximate positions, work the ribs into the

notches on the trailing edge but do not glue anything yet.

DD 8. Punch out the two Rib Gauge Pieces from the

1/8" die-cut plywood sheet (SPRTW08) and assemble them

using CA. Notice that one end of the gauge is slanted at a 5

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.

NOTE: Begin building the LEFT wing panel, starting at

step 5 on page 10. Continue through step 8 on page 15.

Next, repeat these steps to build the right wing panel.

DD 5. Pin one of the notched balsa Inner Trailing

Edges (SPRTW 11) to the plan lining up the notches in the TE

with the notches on the plan. Notice that the notches near W3

are only 1/16" wide since half of the 1/8" wide rib notch is in

the inner T.E. and the other half is in the outer T.E..

DD 6. Place one of the 1/8" x 5/16" x 23-1/2" Basswood

Inner Spars (SPRTW13) on the wing plan and pin the spar

down with crossed T-pins as shown in the following sketch.

DD 9. Make sure the ribs are properly positioned accord-

ing to the plans and glue them in place using thick CA at the

spar joint and a drop of thin CA at the trailing edge joint. Use

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Great-planes Spectra Electric Sailplane Kit - GPMA0540 User Manual Page 10

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