Instruction manual

C. Select the #122-65 Steel Tail Rotor Hub, one #0873-1 Tail Rotor Blade Mount, the remaining #0457 Thrust

Bearing components, one #0446-4 M4 Shim Washer, one #0021 M4 Locknut and a 7.0mm socket or nut

driver. While holding the tail hub in a vertical position, slide one of the #0873-1 Tail Rotor Blade Mount

assemblies onto the T/R hub, followed by one #0446-4 0.003” shim. Using a small screwdriver or toothpick,

apply Green Locktite to the threaded portion of the #0021 M4 Locknut. Install the locknut using a thin-walled

7mm socket wrench onto the threaded portion of the tail rotor hub. Select any tool that will insert into the hub

center hole to stop rotation. Tighten the #0021 M4 locknut until a slight amount of tension is felt on the tail

rotor blade grip while rotating. Slightly back off the M4 locknut until the tail rotor blade grip rotates freely

with little or no play. Repeat the process for the opposite tail rotor blade mount. Adjust the end play to match

the first mount installed.

D. NOTE

: The opportunity exists, at this time, to balance the hub assembly. If a very thin coat of grease was

applied to the thrust bearings, then balancing can be done at this time. If, however, you used more grease than

suggested, we recommend waiting until one flight is complete since the excess grease will no longer be a

factor in the balance procedure. Balancing the assembly is not mandatory but highly recommended.

The following will describe the process. If a balancer is not available, select the #0541-8 Tail Rotor Output

Shaft from the bag #10C. Obtain a large glass with a smooth top rim of at least 90.0mm (3.5@) in diameter.

Use the shaft as a pivot point by inserting it into the hub and sliding the hub to the center. The shaft will then

sit atop the glass allowing the hub assembly to pivot freely. The proper balance method is called a Afour

point@ balance. Two steps are involved. Always orientate the blade mounts with the threaded control arms in

opposite directions (as in flight). First, rotate the unit atop the glass so that the tips of each blade mount point

at six and twelve o=clock positions. Releasing them at this position should result in the assembly remaining

vertical. Second, rotate the assembly until at three and nine o=clock positions. If the assembly will not remain

at the three/nine o=clock position then you can select a shim or washer and install it under the pivot bolt in the

blade mount to secure the tail blade, it may be necessary to trim the washer to adjust the weight. Select two

#0019 locknuts, two #0097 bolts and two of the appropriate tail blades. Install each blade orientated as shown

in drawing 10A, noting that each leading edge corresponds to a pitch arm control ball on each blade mount.

Temporally tighten each blade so that they will not pivot easily during handling. Rotate each blade so that the

trailing edges can be simultaneously pressed against a straight edge (table top) while pulling out firmly. This

will approximate flying position. Set the assembly (with shaft #0541-8 still temporally installed) atop two

glasses on a level table top (or suitable blade balancer) and observe which (if any) blade appears heavier.

Balance can be achieved easily by either adding a small piece of tape to the lighter blade tip or trimming a

little plastic from the Aheavy@ blade tip. Loosen each blade pivot bolt until the blades will pivot freely (but not

by their own weight alone). Remove the #0541-8 shaft.

Step 2: Assembling the Pitch Slider

Parts Required: Bag #

2 #0015 M2 Hex Nut 10B

1 #0101 M2x5 Threaded Ball 10B

2 #0049 M2x10 Socket Head Bolt 10B

1 #0435 Tail rotor pitch slider (brass) 10B

2 #0443 M6 retaining ring 10B

2 #0859-16 Pitch links w/bearings 10B

1 #120-14 Tail Rotor Pitch Yoke 10B

2 #0439 Ball Bearings 10B

1 #0437 Plastic Pitch Ring 10B

Refer to Drawing #10B