Great Planes Spirit of St. Louis ARF - GPMA1151 - Manual (Page 15)

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11. Put a mark at the top of the molded plastic cowl. The
center section of the cowl has a line which points to the top.
Note that this is aligned with the indentation for the top
cylinder. Trim the excess material from the aft edge of the
cowl. Cut a hole in the front of the cowl for the gearbox.
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12. Carefully cut the molded cylinder heads from the plastic
sheet. Lightly sand the edges flat and smooth with some 120-
grit sandpaper placed flat on your worktable. Glue two of the
cylinder heads together to form a cylinder head assembly. This
is easiest to do if you hold the assembly as shown in the photo
while gluing the center section together first with CA. After the
CA has cured, hold the assembly in the center and glue the
rippled ends together.
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13. Carefully cut this assembly in half to obtain two
cylinders. Do this for the remaining cylinder heads to obtain
nine complete cylinders.
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14. Glue all nine cylinders to the cowl with medium CA.
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15. Carefully cut the molded plastic spinner and spinner
base from the plastic sheets. Make the cutouts for the prop in
the spinner. Do this a bit at a time, until the propeller fits nicely
into the spinner.
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16. Glue the 1/32” ply spinner former (6) inside the
plastic spinner base with medium CA. Using the dimple in
the molded plastic spinner as a guide, carefully drill a 7/32”
[5.6mm] hole in the center of the assembly.
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17. Center the cowl on the prop shaft adapter. Drill a
1/16” [1.6mm] hole through the cowl into the balsa nose
formers for each screw. Mount the cowl to the fuselage with
three wood screws. This photo shows the finished cowl
mounted to the completed model. Refer also to the photo at
step 18.
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