1.
q
In the next steps you will wrap your tail boom with white trim sheet to give it color. Note
that the tail boom bracket and tail rotor gearbox fit at each end of the tail boom as shown
in Fig. 10-2). Cut two strips of white trim sheet 6.5" x 1-5/8" (165mm x 41mm). Wrap one
sheet around the front half of the tail boom leaving 1-3/16" (30mm) of the front end
exposed to fit inside the tail boom bracket (note that the front end of the boom is the end
without the slot). Wrap the other sheet around the rear half of the tail boom leaving 5/8"
(16mm) exposed to fit inside the tail rotor gearbox. As you roll the trim sheets around the
boom, the seam should overlap about .25" (6mm) to seal out oil.
2.
q
Locate two plastic end-bushings and a single center-bushing. Apply a drop of oil to the
shaft hole in the center bushing, and insert it into the aluminum tail boom (refer to Fig.
10-1). Note that the center bushing is tapered, and will go into the tail boom in only one
direction. Push the bushing to the middle of the boom with a long wooden pencil, and
insert an end bushing into each end of the boom.
3.
q
Slide the tail boom mounting bracket onto the front end of the boom as shown in Fig. 10-1
with the double bolt holes positioned below the boom.
4.
q
Fill the shaft holes in the two end bushings with oil. Slide a small (#1) teflon washer onto
the drive wire, and insert the wire into the rear bushing (located at the notched end of the
boom), through the center bushing and out the front bushing.
Note:
The hole in a #1 washer is smaller than the hole in a #2 washer. If a #2 bolt will not
pass through a washer, it is probably a #1 washer.
5.
q
Clean the end of the drive wire at the front end of the tail boom with a tissue to remove
any oil. Slip a small (#1) teflon washer over the wire, and mount the front pinion gear to
the wire with two 6-32 x 3/16" setscrews and threadlock. Leave a small gap between the
front pinion gear and washer (about the thickness of a piece of newspaper) to avoid
excessive drag and wear. The drive wire should rotate freely inside the bushings.
6.
q
Attach two pushrod guides to the tail boom with short nyties (nylon cable ties) as shown.
The exact orientation will be set later when the tail rotor pushrod is attached. After pulling
the nyties tight with a pliers, cut the excess off with a knife or scissors.
7.
q
Locate the 7x13x4mm and remaining 5x11x4mm ball bearings, and apply oil as you did
before for the main rotor.
8.
q
As shown in Fig. 10-2, slide the tail rotor hub into the 7x13x4mm bearing and over the
end of the tail rotor shaft until the end of the hub rests against the plastic bevel gear.
Press the hub and gear together while securing the hub to the shaft with 6-32 x 1/8"
setscrews and threadlock. Make sure no threadlock gets on the tail rotor shaft inside the
tail rotor hub. This will make disassembly difficult later.
Construction Manual
Tail Boom
10-2
LITE MACHINES
