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6. Tape the proper engine mount template to the firewall,
aligning the template on the lines you have drawn on the
firewall. Drill a 3/32" [2.4mm] pilot hole through each of the
marks in the corners of the template. Enlarge each of the holes
by drilling through the pilot holes with a 3/16" [4.8mm] drill bit.
7. Remove the template and install four 8-32 blind nuts
on the backside of the firewall. This is easily done if you
insert an 8-32 bolt into a #8 washer. Insert the bolt and
washer through the hole. Reach into the fuselage with the
blind nut, screwing it to the bolt. Tighten the bolt against the
firewall, pulling the blind nut into place.
8. Mount the engine mount and engine to the fuselage
with four 8-32 x 1" [8-32 x 25mm] socket head cap screws,
four #8 lock washers, four #8 flat washers and Thread-Lock.
(Depending on your engine, you may have to remove the
engine from the engine mount before installing the mount to
the firewall. If this is the case with your engine, re-install the
engine to the mount after the mount is attached to the
fuselage). Leave the bolts slightly loose. Center the engine
on the firewall and then tighten the bolts.
Note: The next 7 steps show how to install the throttle
servo for the O.S. 1.20 four-stroke and the O.S. .91 two-
stroke. As mentioned earlier you may have to modify
these steps for your particular engine. On some of our
prototypes we installed the throttle servo inside the
fuselage using the tray that is provided. Take a minute to
read through these steps before proceeding with the
installation of your throttle servo.
9. Locate the die-cut 3mm plywood parts for constructing
the throttle servo tray. Glue them together as shown.
10. Drill four 1/16" [1.6mm] mounting holes in the servo
tray for the throttle servo. Thread a mounting screw (included
with the servo) into each hole and then remove the screw.
Apply thin CA to the holes to harden the wood. After the glue
has cured, install the servo into the tray using the hardware
that came with the servos.
11. Drill a 1/8" [2.8mm] hole into the servo tray on each
side of the servo.
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