Great Planes PT-17 Stearman .91-1.20 ARF - GPMA1349 - Manual (Page 10)

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7. On the bottom wing, cut the covering away from the
holes in the leading edge of the wing for the nylon wing
dowels. Glue them in place with 6-minute epoxy. Wipe any
excess epoxy away with denatured alcohol. When properly
positioned the wing dowels should extend approximately
3/8" [9.5mm] beyond the leading edge of the wing.
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8. Cut the covering from the holes on the plywood wing
bolt plate.
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9. Cut the covering from the holes at the wing trailing
edge on both the top and bottom of the wing.
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10. Place the wing bolt plate in position over the holes in the
bottom wing. Use the nylon wing bolts to help you align the
holes in the plate with the holes in the wing. Trace the outline of
the plate onto the covering with a felt-tip pen. Use a sharp #11
blade and refer the “ Expert Tip” that follows to cut the covering
inside the lines you have drawn. Use caution not to cut through
the surface of the wing skin. Remove the covering.
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11. Glue the wing bolt plate to the wing using epoxy. Use
small clamps to hold the wing bolt plate in position while the
glue cures.
Use a soldering iron to cut the covering from the stab. The
tip of the soldering iron doesn’t have to be sharp, but a
fine-tip does work best. Allow the iron to heat fully. Use a
straightedge to guide the soldering iron at a rate that will
just melt the covering and not burn into the wood. The
hotter the soldering iron, the faster it must travel to melt a
fine cut. Peel off the covering.
HOW TO CUT COVERING FROM BALSA
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