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8. Drill a 11/64" [4.5mm] hole at each paint
mark. The drill should be perpendicular to the
bottom surface of the wing while drilling. The bolts
must thread into the blind nuts squarely.
9. Position the wing bolt plate onto the bottom
of the wing. The plate should be positioned to
equally cover both holes. Trace around the outside
of the plate using a felt-tip marker. Carefully
remove the covering from the wing where the plate
will be installed, making sure not to cut into the
underlying wood. Secure the wing bolt plate using
medium CA. Once the CA has cured, drill the plate
using a 11/64" [4.5mm] drill bit using the holes
drilled in the wing as a guide.
Engine Installation
1. Place the two plywood engine mount spacers
behind the engine mount if you are using a
2-stroke engine. Use four 3mm x 20mm machine
screws to secure the engine mount to the firewall.
Blind nuts have already been installed in the
firewall for this purpose. (If you are using a 4-stroke
engine, the spacers are not required.) Coat the
firewall, engine mount spacer and all other bare
wood around the firewall with fuelproof paint or
30-minute epoxy thinned with alcohol. Fuelproof
other areas of bare wood in the fuselage that may
be exposed to fuel or engine exhaust such as the
fuel tank area and the front and back of the wing
saddle. Avoid getting epoxy in the threads of the
blind nuts in the back of the firewall.
2. Temporarily attach the engine mount plates
to the engine mount using four 3mm x 12mm
machine screws. Adjust the width of the plates to
fit the engine, leaving a 1/16" [1.5mm] gap
between the engine and plates. Tighten the screws
so you can mark the engine mounting holes
without moving the plates.
3. Position the engine on the engine mount
plates so the propeller thrust washer (or spinner
backplate) is 4-3/4" [121mm] ahead of the firewall.
Use a sharpened piece of wire to scribe the four
8
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