Top Flite TOPA0905 - Manual (Page 29)

❏
3. Cut the tabs from the engine mount. Then, cut
1/2" [13mm] from the front of each mounting rail.
(This is needed to allow room for mounting the
dummy engine later in this manual). Install the
engine mount to the firewall with four 8-32 x 1-1/4"
[32mm] socket head cap screws, #8 flat washers and
#8 lock washers. When installing the mount, be sure
that you have the mount positioned allowing the
engine to be mounted on its side.
❏
4. Position the engine on the mount so the distance
from the firewall to the front of the thrust washer
measures 6" [152mm]. Mark the location of the engine
on the mount. The Great Planes
® “Dead Center” Hole
Locator (GPMR8130) works well for this. Drill through
the marks you have made with a #29 or 9/64" [3.6mm]
drill bit. Tap each hole with an 8-32 tap.
❏
5. Install the engine to the mount with four each,
8-32 x 1" [25mm] socket head cap screws, #8 lock
washers and #8 flat washers.
❏
6. Install the muffler onto the engine. Examine the
photo and you can see the line the throttle servo must
follow. Install the throttle servo into the servo opening
in the fuselage and drill a 1/16" [1.6mm] hole through
each of the mounting holes. Remove the servo. Then,
install and remove a servo mounting screw into each
hole. Apply a couple drops of thin CA into the holes to
harden the threads. When the glue has cured,
permanently mount the servo. Using the location of
the throttle arm and the photograph as references,
determine the location the throttle wire will pass
through the firewall. Mark the location and then drill a
3/16" [4.8mm] hole on the mark. Cut the 36" [914mm]
white plastic tube to 12-1/2" [318mm]. Roughen one
end of the tube with 220-grit sandpaper. Insert the
smooth end of the tube into the hole you drilled. Then,
glue the roughened end of the tube to the firewall.
❏
7. Install a brass screw lock
connector, nylon retainer ring and a
4-40 x 1/8" [3mm] socket head cap
screw onto the outer hole of the
servo arm and the throttle arm.
❏
8. Cut the threads from an .074 x 36" [914mm]
threaded rod. Bend it to fit from the throttle servo arm
to the throttle arm. When bending the wire be sure
that you have clearance between the pushrod and
any of the engine/muffler components. Metal contact
may create radio interference. Slide the pushrod wire
into the brass screw lock connectors. Then, tighten
the 4-40 x 1/8" [3mm] socket head cap screw against
the throttle pushrod wire. Cut off any excess wire.
- 29 -