Great Planes Spirit of St. Louis ARF - GPMA1152 - Manual (Page 14)

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1. Using three 2 x 10mm wood screws, install the motor
and gearbox onto the firewall. Plug the motor into the
electronic speed control.
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2. Install the prop adapter onto the gearbox output shaft.
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3. 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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4. 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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5. 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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6. Glue all nine cylinders to the cowl with medium CA.
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7. 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.
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8. Slip the plastic adapter ring into the propeller. Install
the propeller onto the prop adapter and secure it with the
washer and nut.
Motor Installation
14