Engine Mounting Preparations - GREAT PLANES Extra 300S ARF Instruction Manual

Once the glue has cured, install the servo tray in place as
shown using 6-minute epoxy. The notched side fits against
the former.

Engine Mounting Preparations

1. Top and bottom firewall support: Make marks 1/8" [3.2mm]
away from the edge of the firewall at the center of the
firewall support lip and 3/4" [19mm] to either side.
2. Firewall side supports: Make marks 5/8" [16mm] away
from the edge of the firewall side supports' flanges as shown
in the photo above.
3. Drill 1/8" [3.2mm] holes 1" [25mm] deep at all the marks.
4. Mix some 30-minute epoxy. Wick some epoxy inside
the holes drilled in the previous step. Insert a 1/8" [3.2mm]
dowel inside a hole and slide it in and out several times to
make sure that it is coated in epoxy. Push the dowel all the
way in and cut it so that about 1/8" [3.2mm] of it protrudes.
Repeat this step for all the holes. Clean up any excess glue
with a paper towel dampened with denatured alcohol.
Repeat this procedure for the bottom firewall.
5. Once the epoxy has cured, sand the dowels flush with
the firewall supports.
6. Fuelproof the inside of the firewall and the sanded
areas with epoxy mixed with alcohol. Let the epoxy cure.
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