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STEP12
Motor Pinion Gear
2
1
2.5x6mm
F/H Self-Tapping Screw
1
2
4x10mm
Socket Hex Machine Screw
2
3
3x4mm
BT Philip Machine Screw
Gear Ratio Formula
Spur Gear
Pinion Gear
Final Gear Ratio
Max. Speed
Slow
Acceleration
Good
Running Tine
Long
Adjust the gear ratio by changing pinion gears according to the size of the track and other conditions.
SPARROWHAWK XB RTR at present comes with 70T spur gear and 22T pinion gear. Thunder Tiger also provides 19T/20T/21T/23T/24T/25T/26T racing
pinion gears as optional parts. For other gear ratios, please find optional gears with standard 48pitch from the aftermarket parts.
SPARROWHAWK XB RTR
STEP13
Installation of Motor Mount
3
1
3x10mm
F/H Philip Machine Screw
Finally tighten the motor
mount screw.
Hint
1
4
3x4mm
Set Screw
1
5
3x6mm
Washer
72(48 Pitch
19
20
21
22
23
12.83
12.18
11.60
12.08
10.60
70T/22T,
48P
1
Pay close attention here
Note to insert a washer into the gap to avoid breakage of motor
mount caused by overtighten screw.
)
70(48 Pitch
24
25
26
21
22
23
10.15
9.75
9.37
11.28
10.77
10.30
19T/20T/21T/23T/24T/25T/26T
1
1
15
3
1
4
3
1
)
24
25
26
9.87
9.48
9.11
Fast
Bad
Short
Turn the motor to find proper gear mesh, the
spur gear should spin smoothly after adjusting.
2
5
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