Pro Boat PRB4250B - Manual (Page 4)

Impulse 31
Install propeller, Rudder and fins
1. Align the propeller with the drive dog on the flex shaft
and install the propeller using the included locknut.
Tip: Remove the left and right trim tabs from the boat to
install the vertical fins more easily.
2. Install the left and right turn fins using two M3x8 cap
screws for each turn fin (total of four screws). Adjust the
vertical fins for the desired stability.
3. Install the left and right trim tabs using two M3x10 cap
screws for each trim tab (total of four screws).
4. Attach the rudder to the rudder pivot plate using one
M3x15 cap screw and one 3mm locknut (top hole).
5. Install one M3x10 Phillips head screw in the rudder
pivot plate (bottom hole). The Phillips head screw also
acts as a shear pin for the break-away rudder.
6. Connect the cooling line to the top of the rudder.
7. When the boat is moving forward, ensure water flows
out of the coolant outlet on the side of the boat. If water
does not flow out of this outlet, remove any blockage
from the rudder inlet and coolant system or the motor and
ESC (electronic speed control) may overheat.
Ensure the trim tab panels are flush with the bottom of
the boat. You may desire to bend the trim tabs for wind
and water conditions. To adjust the angle of the trim tabs,
use a large pair of pliers to bend the tabs. This must be
done carefully so that you do not damage the hull.
CAuTION: Always use caution when installing the
fins or handling your boat, the turn fins are sharp. Failure
to do so could cause personal injury
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Antenna Tube Installation
1. Carefully feed the end of the longer receiver
antenna through the grommet inside the hull.
2. Pull the antenna wire out of the grommet
towards the outside of the boat, then slide the
antenna through the antenna tube.
3. Insert the tube into the grommet, then
fit the cap onto the tube.
4. Apply clear tape to the antenna, grommet
and hull in the boat to keep the antenna
from moving.
Arrange the shorter antenna in the hull at a right or near
90 degree angle to the antenna in the tube. Attach the
antenna inside the hull, away from all electrical wiring and
components using clear tape.
The antennas must be installed correctly above the boat's
water line to get the best reception of your transmitter's
signal.