Pro Boat PRB2850 - Manual (Page 6)

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For optimum performance, propeller balancing can
add several mph to top speed and reduce vibration.
There are several different propeller balancing tools
available. Read the instructions that accompany the
propeller balancing tool, as removing material from
the correct part of the propeller is crucial. Contact
a local hobby retail store for assistance.
Use only Zenoah ® 2-Cycle Synthetic Oil and
premium gasoline mixed 32:1 to power the
Blackjack 55. Fill the tank completely and secure the
fuel cap. Keep fuel in a moisture-free environment,
as stale fuel will cause the Zenoah G26M engine to
lose performance.
Before the first run of the Blackjack 55, you should
check the radio for proper operation and to ensure
proper control movement of the rudder and
throttle. Also ensure that the antenna on the boat
is extended properly and that all batteries are in
working condition.
m 1. With the radio system turned on (transmitter
and receiver) and the transmitter antenna down
(engine off), walk off 40 to 50 paces from the
Blackjack 55.
m 2. Have an assistant remain with the boat to
check for proper control movement of the
rudder from your transmitter input.
m 3. If everything appears to be operating
correctly, raise the antenna and start the engine.
Place the boat in the water and run it (at about
1⁄3 throttle) close to the shoreline. If the radio
system is operating properly, you can begin to
run the boat faster and further away from the
shoreline.
Note: It is a good idea to range
check prior to operating your boat
after any repair, installation of new
batteries, or at the beginning of
each boating session.
Option Item: Race Guard™ Micro Fail-Safe
The programmable fail-safe unit is designed to
return your throttle to a preset brake position in
the event of a signal loss to your receiver or when
the receiver's input drops below 4.0 volts.
m 1. Turn on the transmitter, then the receiver.
Center the steering wheel and trim lever.
Check that both rudder servos operate using
the radio system.
m 2. Slide the rudder control arms onto the
rudder shafts.
m 3. Position the rudder control arms at a
90-degree angle to the rudder as shown. Tighten
the 3mm x 15mm hex screws, securing them
with 3mm nuts.
Important: Always use screw-
locking compound on metal-to-
metal fasteners to prevent them
from vibrating loose.
Note: The twin-oversized
rudders offer incredible handling
and eliminate the need for skid
fins. They also help protect the
propeller from impact with
submerged obstacles in the water.
Care must be taken in shallow
water to keep the rudders from
becoming damaged.
Section 7: Propeller Balancing
Section 8: Fueling the Tank
Section 9: Range Checking the JR XR3i Radio System
Section 6: Installing the Rudders