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To achieve a good starting
point for the slipper clutch
in these models, tighten the
slipper clutch adjusting nut
clockwise until the slipper
clutch adjusting spring
fully collapses (do not over
tighten), and then turn the
slipper clutch nut counter-
clockwise one full turn.
Do not run your model with
the slipper clutch adjusting
spring fully compressed. The
minimum recommended
slipper clutch setting is 1/2
turn counterclockwise from
fully compressed.
24 • BIGFOOT BRUSHLESS
ADJUSTING YOUR MODEL
Once you become familiar with driving your model, you might need to
make adjustments for better driving performance
Adjusting the Slipper Clutch
The model is equipped with an adjustable
slipper clutch, which is built into the large
spur gear. The purpose of the slipper
clutch is to regulate the amount of
power sent to the rear wheels to
prevent tire spin. When it slips,
the slipper clutch makes a high-
pitch, whining noise. Remove the
rubber slipper clutch plug on the
transmission cover in order to adjust the slipper. Use the 4-way wrench
to turn the adjusting nut clockwise to tighten and counterclockwise to
loosen. Place the model on a high-traction surface, such as carpet. Adjust
the slipper so that you can hear it slip for approximately two feet from a
standing, full throttle start. (Learn more about adjusting the slipper clutch
in the sidebar.)
Motor and Gearing
One of the more signi cant advantages to your model's transmission is
the extremely wide range of available gear ratios. It can be geared low
enough to run an extremely hot, modi ed motor. A modi ed motor
should be geared lower (higher numerically) than a stock motor because
it will reach its maximum power at higher rpms. A modi ed motor that
is geared incorrectly can actually be slower than a correctly-geared,
stock motor. Use the following formula to calculate the overall ratio for
combinations not listed on the gear chart:
# Spur Gear Teeth
x 2.72 = Final Gear Ratio
# Pinion Gear Teeth
If you are worried that you might be over-geared, check the temperature of
the battery pack and motor. If the battery is extremely hot, and/or the motor
is too hot to touch, your model is probably over-geared. If you are not able to
run your model for at least four minutes before the battery dies, then change
to a lower gear ratio. This temperature test assumes that the model is close to
factory stock weight and operates freely with no excessive friction, dragging,
or binding, and the battery is fully charged and in good condition.
www.modellmarkt24.ch
The model is equipped with a BL-2s 3300kV motor. The gear combination
that comes stock on each model provides good overall acceleration and top
speed. If you want more top speed and less acceleration, install high-speed
gearing (more teeth) or if you want more acceleration and less top speed,
use a smaller pinion gear (optional gearing not included).
The BL-2s 3300kV is equipped with an integrated cooling fan that is
e ective during medium to high-speed operation. The gearbox is
Tighten
specially vented to cool the motor. Repetitive starting and stopping
over short distances creates excess heat and will not allow the fan to
cool the motor properly. For this type of driving, smaller pinion gears are
recommended to reduce load on the motor.
Loosen
Gearing Compatibility Chart (see sidebar)
The chart in the sidebar shows a full range of gear combinations. This
does NOT imply that these gear combinations should be used. Over-
gearing (bigger pinions, smaller spurs) can overheat and damage the
motor and/or speed control.
Adjusting Gear Mesh
Incorrect gear mesh is the most common
cause of stripped spur gears. Gear mesh
should be checked and adjusted anytime a
gear is replaced. To set the gear mesh, cut a
narrow strip of notebook paper and run it into
the gear mesh. Loosen the motor screws and
slide the motor and pinion gear into the spur
gear. Retighten the motor screws and then
remove the strip of paper. You should be able
to run a fresh strip of paper through the gears
without binding them.
Centering Your Servo
If the trim controls on your transmitter seem o , you may need to re-
center your servo. Additionally, whenever your servo has been removed
for service or cleaning, it must be re-centered prior to installation in the
model.
1. Disconnect the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect the
electronic speed control (ESC) to channel 2.
3. Place fresh "AA" batteries in the transmitter and turn the transmitter
power switch on.
4. Turn the steering trim adjustment on the transmitter to the center "0"
position.
5. Elevate the rear wheels of the model. Connect a fresh 7.2V battery pack
to the speed control and turn on the ESC (see page 21). The servo will
automatically jump to its center position.
Strip of
Paper
Motor
Screws
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