Great Planes PT-40 Kit (original) - Manual (Page 22)

D 4. Carve and sand the wing tip to blend in with
the tip rib, L.E. and T.E.
D 5. Sand the front and rear comers to a rounded
shape as shown on the plan. Also sand the top and
bottom edges to a slightly rounded shape.
SAND THE WING SMOOTH
D 1. Lightly sand the entire wing with your T-bar
and 100 grit sandpaper. Pay special attention to
blending the ribs in with the leading and trailing
edges and spars and removing any excess glue re-
sidue that would cause bumps when the covering is
applied later.
D 2. Now lightly sand the wing again with a T-
bar and 220 grit sandpaper. After this step, the wing
should be very smooth and ready for covering.
INSTALL THE WING PLATES
D 1. Find the two pieces of 1/32" x 3/4" x 1-1/2"
plywood. These are the "Wing Plates" which protect
the trailing edge at the points where the wing hold
down rubber bands are fastened.
D 2. Working on the table edge, use a sanding block
to "feather" (taper) the edges of the wing plates.
Feather three edges of each plate, leaving one long
edge square.
D 3. Make marks on the T.E., 1" each way from the
wing centerline.
D 4. Put the wing plates in position on the T.E.
The edge of the plate that is not feathered goes to
the rear along the trailing edge. The 1" marks you
made in step 3 are where the plates begin.
D 5. Apply thin CA glue around the edges, holding
the plates firmly in place until the glue sets.
TRIAL FIT THE WING IN THE SADDLE
D 1. Using your T-bar sander, sand the inside edge
of the plywood fuse side doublers at the same angle
as the F-2A or F-2B formers.
D 2. Lay the wing in place on the fuselage with
the T.E. resting against the front of F-3.
D 3. Notice that the center of the wing L.E. rests
on the top rear portion of the windshield, preventing
the wing from resting down onto the fuse sides. Mark
the area of the windshield that needs to be cut away.
D 4. Using an X-Acto knife and a sanding block,
carefully remove part of the windshield, a little at
a time, until the wing rests down flat on the fuse
sides. You may have to cut into F-2 slightly.
D 5. Find the two 5/16" diameter hardwood wing
hold down dowels that are 5-3/16" long. Round the
ends of these dowels slightly with sandpaper.
D 6. Insert the dowels into the holes in the fuse
sides. Enlarge the holes with a round file or drill, if
necessary.
DO NOT GLUE THE DOWELS IN PLACE
UNTIL AFTER THE FUSELAGE HAS BEEN
COVERED.
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