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yoke are connected to the integral tail rotor blade holders using
the two 1.5 Ø x 20 mm dowel pins 111.
Fig. TR-07
Press the ballrace 117 into the tail rotor housing as far as it
will go.
Fig. TR-08, Fig. TR-09
Press the tail rotor assembly into the tail rotor housing. Once
again, check that there is no gap in the bearing seat.
4.4 Securing the tail rotor shaft
Fig. TR-10
Slide the collet bush 26 onto the tail rotor shaft from the right-
hand side; there should be no perceptible axial play in the
assembly. When you are confident of this, apply a drop of
thread-lock fluid to the two M3 x 4 grubscrews 107 and tighten
them to secure the collet bush.
4.5 Installing the tail rotor control system
Fig. TR-11
First insert the control yoke bush 27 through the central hole
in the control yoke from the inside, pushing it in as far as it will
go. Now fit the control yoke collet 24 from the other side, and
secure it with the M3 x 3 mm grubscrew 107; this screw should
also be secured with a drop of thread-lock fluid. Ensure that
the control yoke is able to rotate with as little friction as
possible. Now slide the tail rotor pushrod 37 through the tail
rotor shaft from the right-hand side. Grease the pushrod, so
that the system works as smoothly and easily as possible.
4.6 Attaching the tail rotor bellcrank
Fig. TR-12
The tail rotor bellcrank 82 is fitted using the M2 x 10 mm
screw 96 and the associated 5 Ø x 2.2 Ø x 0.3 mm washer
104. Insert the pre-formed part of the tail rotor pushrod in the
hole in the shorter arm of the bellcrank. Once again, please
ensure that the crank swivels as smoothly and freely as
possible, with the absolute minimum of lost motion.
4.7 Tail rotor guard
Fig. TR-13
Push the wire tail skid 39 into the channels in the tail rotor
housing 81, and secure it with a little cyano.
4.8 Checking the tail rotor assembly
Fig. TR-14
Now that the mechanical assembly of the tail rotor is complete,
it is time to check that all the parts are correctly fitted, referring
carefully to the illustrations: ensure that all the components
are set at the correct angle relative to each other, that the
direction of rotation of the tail rotor is correct, and that the
system operates freely and smoothly. You can check the
operation of the system by moving the bellcrank by its long
arm, i.e. the arm to which the tail rotor pushrod will eventually
be connected.
5 Completing the tail boom
5.1 Preparing the tail rotor shaft bevel gears
Fig. TB-01
Push the bevel gear hexagon inserts 23 into the two tail rotor
shaft bevel gears (front 73, rear 74), taking care to align the
holes correctly when fitting the parts together. Fit the M4 x 4
36
mm grubscrews 110 from both sides, but do not tighten them
for the moment.
5.2 Preparing the tail boom
Fig. TB-02
Slide the central bushes 67 onto the tail rotor shaft 34, and
slide each into the tailboom 29, corresponding to the picture.
The best method of accomplishing this is to cut a scrap piece
of tubing (not included in the kit) , according to the dimensions
in the picture, and use it to push the bushes along the boom
until the "pushing tube" is flush with the ends of the tail boom.
The next step is to insert the end bushes 68 into both ends of
the tail boom.
Fig. TB-03
Attach the front tail rotor shaft bevel gear 73 at the end of the
boom which features a hole located 41 mm from the cut end.
The hole at the rear is only 20.5 mm from the end, and this is
where the rear tail rotor shaft bevel gear 74 should be fitted.
Remember to install the washers 118 between the tail rotor
bevel gears and the end bushes. Apply a drop of thread-lock
fluid to the grubscrews 110 in the bevel gears, and tighten
them firmly onto the tail rotor shaft. Check that the system
moves smoothly and freely, and that there is barely perceptible
axial play in the shaft.
Fig. TB-04 & -05
6 Final assembly
6.1 Preparing the main bevel gear
The hexagon insert 25 can now be pressed into the main bevel
gear 72: ensure that the threaded holes line up with the through-
holes for the two 4 x 6 mm grubscrews 108, and fit the screws
at the same time.
Fig. AS-01
6.2 Main rotor shaft - installation
Prepare two collet bushes 26 by screwing two M3 x 3 mm
grubscrews 107 into each one.
Fig. AS-02
Press the first collet bush 26 into the ballrace 117, with the
spigot at the bottom, and place this assembly in the semi-
circular recess in the centre of the mechanics.
Fig. AS-03
Push the spigot of the second collet bush 26 through the upper
ballrace from the underside, and place the main bevel gear on
the collet in the centre of the mechanics. Slide the rotor head
down to the point where the main rotor shaft is visible at the
underside of the motor.
Fig. AS-04
Connect the rotor head ball-links to the upper swashplate as
shown.
Fig. AS-05
Now apply thread-lock fluid to the M3 x 3 mm grubscrews in
the collets and the motor shaft support, and tighten the screws;
the grubscrews in the main bevel gear are tightened later.
Fig. AS-06
6.3 Attaching the tail boom
Insert the tail boom in the rear socket in the chassis, and
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