From parts bag 2: Assemble the Constan Tail Drive Gear Assembly (R50), start by pressing the shaft
through the Counter Gear then selide two M5x7x2 spacers, then slide the two M5x13 Ball Bearings.
Again slide two M5x7x2 spacers onto the shaft and slide the Alloy Drive Gear onto the shaft aligning the
flat spot on the shaft. Insert one M4x4 set screw (Tip1) into the Alloy Drive Gear and tighten in place.
Alloy Drive Gear 14T
(
SE50
) [CN2224]
M5x7x2 Spacer x 2
5x13 Ball
Bearings x 2
[CNBB1350]
Drive Shaft
[CN2263D]
Counter Gear 55T
[CN2263C]
Counter Gear 53T
(Option 3D Hi-Spd)
[CN2263F]
M4x4 Set Screw
(
50
)
Expert tip, once all components
are in their final position, using
a needle apply one drop of blue
threadlock carefully at the joint
between each bearing and the
shaft.
Warning
, threadlock
will damage a bearing.
2
M5x7x2 Spacer x 2
Constan Tail Drive
Assembly
CN2263A
The Main Gear is
“NOT” pre-assembled
Insert the aluminum center hub into the main gear then
install the “C” spring ring onto end of hub. The Main Shaft has a step in the end of the shaft that is
inserted through the auto-rotation assembly. Insert the bottom end through the constan tail drive auto
rotation gear assembly aligning the holes and secure the Main Shaft using one 3x16mm Socket Cap
Screw and one 3mm Locknut.
Step 13 Main Gear Assembly (R50)
C typr ring
CN2263H
CN2263H
Center
Hub
33
When attaching all pushrods, make sure same length
pushrods are actually the same length from the
beginning otherwise it will be difficult later to figure
out where the linkage problems are coming from.
Attach the following:
Step 42 Rotor Head Linkage
2 Flybar to Washout pushrods (
A
),
2 Bell Mixer to Seesaw pushrods (
I
),
2 Bell Mixer to Inner Swashplate pushrods (
C
),
The Rudder linkage changes the pitch of the tail rotor blades to increase or decrease the torque compensation to
rotate the nose of the helicopter about the main shaft.
Use a servo horn in the shape of a cross and trim the 3 of the 4 arms off. From Bag 4: Install one steel
ball and one 2mm nut at a distance of 12-14mm from the center of the servo remember to use threadlock.
The Rudder Pushrod (
G
) will at this point be installed with one grey ball link at the tail gearbox and one
black ball link at the servo end. Having the radio on and the rudder trim centered press on the servo horn
onto the servo set at 90 degrees to the servo and adjust the length of the pushrod to align the rudder
bellcrank to 70 degrees as shown in the diagram.
Step 43 Rudder Linkage
As the rudder stick is moved to the
right, the rudder pushrod will move
forward increasing the thrust in the
tail blades rotating the nose to the
right.
Push rod (
A
)
Push rods (
I
)
pushrods (
C
)
Push rods (
I
)
Push rod (
A
)
pushrods (
C
)
Blade grips shown ‘0”
degree at this time
Servo set at
90 degrees
rudder bellcrank to 70 degrees as
shown
Tail Pitch Control Rod & Connector
R30 is 763mm c/c, R50 is 823mm c/c
Grey Ball Link
Black Ball Link
R-50
