3
EN
LOSI
®
TENACITY
™
LASERNUT ULTRA 4 1/10 4WD RTR ROCK RACER • INSTRUCTION MANUAL
BOX CONTENTS
Your new Horizon Hobby vehicle has been designed and built with a combination of
waterproof and water-resistant components to allow you to operate the product in many
“wet conditions,” including puddles, creeks, wet grass, snow and even rain.
While the entire vehicle is highly water-resistant, it is not completely waterproof and your vehicle
should NOT be treated like a submarine. The various electronic components used in the vehicle,
such as the Electronic Speed Control (ESC), servo(s) and receiver are waterproof, however, most
of the mechanical components are water-resistant and should not be submerged.
Metal parts, including the bearings, hinge pins, screws and nuts, as well as the contacts in the
electrical cables, will be susceptible to corrosion if additional maintenance is not performed
after running in wet conditions. To maximize the long-term performance of your vehicle and
to keep the warranty intact, the procedures described in the “Wet Conditions Maintenance”
section below must be performed regularly if you choose to run in wet conditions. If you are
not willing to perform the additional care and maintenance required, then you should not
operate the vehicle in those conditions.
CAUTION:
Failure to exercise caution while using this product and complying with the
following precautions could result in product malfunction and/or void the warranty.
GENERAL PRECAUTIONS
• Read through the wet conditions maintenance procedures and make sure that you have all
the tools you will need to properly maintain your vehicle.
• Not all batteries can be used in wet conditions. Consult the battery manufacturer before
use. Caution should be taken when using Li-Po batteries in wet conditions.
• Most transmitters are not water-resistant. Consult your transmitter’s manual or the
manufacturer before operation.
• Never operate your transmitter or vehicle where lightning may be present.
• Do not operate your vehicle where it could come in contact with salt water (ocean water or
water on salt-covered roads), contaminated or polluted water. Salt water is very conductive
and highly corrosive, so use caution.
• Even minimal water contact can reduce the life of your motor if it has not been certified as
water-resistant or waterproof. If the motor becomes excessively wet, apply very light throttle
until the water is mostly removed from the motor. Running a wet motor at high speeds may
rapidly damage the motor.
• Driving in wet conditions can reduce the life of the motor. The additional resistance of
operating in water causes excess strain. Alter the gear ratio by using a smaller pinion or larger
spur gear. This will increase torque (and motor life) when running in mud, deeper puddles, or
any wet conditions that will increase the load on the motor for an extended period of time.
WET CONDITIONS MAINTENANCE
• Drain any water that has collected in the tires by spinning them at high speed. With the
body removed, place the vehicle upside down and pull full throttle for a few short bursts
until the water has been removed.
CAUTION:
Always keep hands, fingers, tools and any loose or hanging objects
away from rotating parts when performing the above drying technique.
• Remove the battery pack(s) and dry the contacts. If you have an air compressor or a can of
compressed air, blow out any water that may be inside the recessed connector housing.
• Remove the tires/wheels from the vehicle and gently rinse the mud and dirt off with a
garden hose. Avoid rinsing the bearings and transmission.
NOTICE:
Never use a pressure washer to clean your vehicle.
• Use an air compressor or a can of compressed air to dry the vehicle and help remove any
water that may have gotten into small crevices or corners.
• Spray the bearings, drive train, fasteners and other metal parts with a water-displacing light
oil. Do not spray the motor.
• Let the vehicle air dry before you store it. Water (and oil) may continue to drip for a few hours.
• Increase the frequency of disassembly, inspection and lubrication of the following:
- Front and rear axle hub assembly bearings.
- All transmission cases, gears and differentials.
- Motor—clean with an aerosol motor cleaner and re-oil the bushings with lightweight
motor oil.
WATER-RESISTANT VEHICLE WITH WATERPROOF ELECTRONICS
QUICK START
Please read the entire manual to gain a full understanding of the LASERNUT U4 RTR vehicle, fine-tuning the setup and performing maintenance.
1. Read the safety precautions found in this manual.
2. Charge a battery for the vehicle. Refer to the included charging warnings and
instructions for battery charging information.
3. Install the AA batteries in the transmitter. Only use alkaline
or rechargeable batteries.
4. Install the fully charged battery in the vehicle.
5. Power ON the transmitter and then the vehicle. Wait 5 seconds for the ESC
to initialize. Always power the transmitter ON before the vehicle and power
it OFF after the vehicle has been powered OFF.
6. Check the steering and throttle control directions. Verify that the servos are
moving in the correct direction.
7. Drive your vehicle.
8. Perform any necessary maintenance.
CHARGING THE BATTERY
The Lasernut Ultra 4 includes Spektrum SMART Technology in the ESC and receiver, which can
provide you with telemetry information including battery voltage and vehicle temperature.
To take advantage of SMART Technology, you’ll need a SMART compatible transmitter. The
included DX3 Active transmitter can be upgraded with the Spektrum Bluetooth Module
(SPM6741) Or, consider upgrading to a SMART Technology compatible Spektrum transmitter
like the DX5C (SPMR5100–transmitter only), DX5 Pro (SPMR5010–transmitter only), or DX5
Rugged (SPM5200–includes SR515 receiver). Use Spektrum SMART batteries to power your
vehicle to take full advantage of SMART Technology, which can communicate battery data
through the SMART system as well.
Visit www.SpektrumRC.com for more information.
SPEKTRUM SMART TECHNOLOGY
COMPONENTS
• Losi
®
Tenacity™ Lasernut Ultra 4 1/10-Scale 4WD RTR Rock Racer
• Spektrum
™
DX3
™
SMART Transmitter (SPMR2340)
• Spektrum SR6100AT 6 Channel AVC Telemetry Surface Receiver (SPMSR6100AT)
• Spektrum
15KG 23T Waterproof Metal Center Case Servo (SPMS614)
• Spektrum Firma
™
SMART 130A Brushless ESC (SPMXSE1130)
• 3668 - 1900Kv BL 4 Pole Motor (SPMXSM2200)
• 4 AA batteries (for transmitter)
Choose a battery designed to work with the Spektrum
™
Firma
™
SMART 130A Brushless ESC
(SPMXSE1130). We recommend the Spektrum 5000mAh 3S 11.1V 50C SMART LiPo hardcase
battery with IC5
™
connector (SPMX50003S50H5) or Spektrum 5000mAh 4S 14.8V 50C SMART
LiPo IC5 hardcase battery with IC5 connector (SPMC50004S50H5). Choose a charger designed
to charge 3S and/or 4S Li-Po batteries.
We recommend the Spektrum SMART dual-output AC charger, 2x100W (SPMXC1010).
Refer to your battery and charger manuals for usage, safety, and charging information.
IMPORTANT:
When using a 3S battery, you must change the motor pinion gear to the 14T
pinion provided with your vehicle.
