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Using a ruler and a pencil, measure down 3/8" from the
top of the motor plate and draw an intersecting mark on the
vertical centerline.
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Measure down 1" from the intersecting mark you drew and drill a 5/16" diameter hole through the motor plate, on
the centerline.
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This hole will allow the motor wires to pass through into the fuselage.
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Slide the motor wires into the hole and push the gear box assembly up against the motor plate.
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To align the gear box assembly properly, the gear box
should be centered from side to side on the motor plate and
the top of the gear box should be even with the mark you
drew (3/8" below the top of the motor plate.)
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When satisfied with the alignment, use a pencil to mark
the locations of the three mounting holes onto the motor plate.
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Remove the gear box assembly and set it aside. Using a drill with a 1/16" drill bit, drill pilot holes through the motor
plate at each of the three marks you drew.
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Set the gear box assembly back into place and realign it.
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Install and tighten the three 2.5mm x 12mm wood screws to hold the gear box assembly securely to the fuselage.
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Be careful not to overtighten the screws or you might strip the plywood motor plate doubler inside the fuselage.
Step 2: Installing the Fiberglass Cowling
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Using a rotary tool with a sanding drum attachment,
carefully cut out the front of the cowling to clear the gear box.
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Using a rotary tool with a sanding drum attachment,
carefully cut out the air-intake and air-exit holes in the front
and sides of the cowling as shown.