RCScrapyard ► Radio Controlled (RC) Models, Parts and Spares ► HPI Crawler King. For Sale in The USA.

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1/8 Scale Electric Rock Crawler:

HPI Crawler King

Radio (Remote) Control Models Parts and Spares
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★ How To, Hints and Tips for the HPI Crawler King ★
  Learn the secrets of how to avoid Radio interference and Servo Twitch on your HPI Crawler King Model.
  Our simple guide will help you choose the right Electric Motor for your Crawler King Model and discover the difference between a single, double or triple wind motor, what advance and retard is and how it can affect the torque and RPM of your motor.
  Find out how to reduce friction and improve the performance of your HPI Models Bearings with a few common sense hints and tips.
  Discover the differences between Ni-Cad, Ni-Mh and Li-Po Batteries and the safest way to charge them.

★ HPI Crawler King ★
HPI Crawler King

★ Radio Controlled Model Accessories: ★
Radio Transmitters etc
Radio Equipment
Radio Receivers
Receivers
Servos
Servos
Bearings and Bearing Sets
Bearings
Body Shells
Body Shells
Tires - Touring, Buggy, Truck, Monster Truck, Rock Crawler
Tires
Wheels/Rims - Touring, Buggy, Truck, Monster Truck, Rock Crawler
Wheels
Battery Packs
Batteries + Chargers
Battery Chargers
Battery Chargers
Brushless Motors
Brushless Motors
Electronic Speed Controllers
ESC
Body Clips
Body Clips
Shock Absorber/Damper Springs
Springs
Heatsinks
Heatsinks
Pinions
Pinions
Spur Gears
Spur Gears
Shock Absorbers/Dampers
Dampers
Gas/Nitro Engines
Nitro Engines
Battery-Analyzer
Battery Analyzers
Battery Connectors
Battery Connectors
Battery-Straps
Velcro Straps
Voltage Testers
Voltage Testers
Battery-Wire
Battery Wire
Gas/Dischargers
Dischargers
Fireproof-Bag
Fireproof Bags
Glow-Starter-Batteries
Starter Batteries
Heatshrink
Heatshrink

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USA

HPI Crawler King: For Sale in the USA

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★ HPI Crawler King: ★


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Buying a Used HPI Rock Crawler.


   Buying a used HPI Rock Crawler, or any used RC Model, has a number of advantages. It is generally cheaper than new, ready built and may come with a variety of expensive hop-ups already installed. Cheap, pre-loved bargains are always becoming available. However, depending on the age of your purchase, it may need a little tender loving care before you can take it out on the back yard.

   The one thing you will always need is an instruction manual. If not supplied with your purchase they can often be downloaded from the HPI website, or purchased separately on eBay. With an instruction manual, any problems with your model Rock Crawler you may discover can easily be fixed.

   When you receive your used HPI model, make a general visual inspection of the chassis, front and rear wishbones, suspension shock towers etc, for anything broken that may need to be replaced. Then, take a screwdriver and box spanner and check each self tapping screw and nut for security, taking care not to over tighten. Next, for those HPI models with oil filled shock absorbers, remove them from the chassis and dismantle the coil springs. The damper shafts should push in and pull out with a smooth action. If you feel a jolt as you change direction, this means the oil has leaked out and must be topped up. At the same time, change the O-Ring seals to prevent more leakage. Also check the damper shafts for damage. If they are scratched, change them as soon as possible.

   If the body shell of your Rock Crawler is broken, ripped or damaged in any way, this can be easily repaired with rubber solution glue. Also, for added protection and if available for your model, fit an under guard to stop dirt and gravel entering the chassis.

   Examine the drive shafts for wear and replaced as required. If possible, change them for titanium. The steel shafts wear and bend too easily.

   The gearbox of your used Rock Crawler should be opened up to check for gear wear and lubrication. A thin coat of grease is often used on internal gears and although this is fine for basic running around on the back yard.

   Gears are a weakness on all RC models. Head on collisions can easily damage the gear teeth on nylon and plastic spur gears. Heavy impacts can also loosen the nuts or self tapping screws that hold the motor in Position, allowing the pinion gear to pull out of mesh slightly and rip the tops off the teeth on your spur gear. To minimise this possibility, fit bolts with locking nuts to the motor mount and remember to check them for security after every two or three runs.

   The steering servo is also prone to damage, the fragile gear teeth of the servo can be broken off, rendering your expensive servo useless, so be sure to obtain a good quality "Servo Saver". Check out my Servo Information article.

   If your used HPI Rock Crawler comes with plastic and sintered brass ring type bearings, check the shafts that run in them for wear. Dust and grit can get into these bearings and abrade the shafts. Therefore, you should replace them all with shielded ball bearings. If the model has been run with ring type bearings, you may have to change all the axles and driveshafts. For more information, take a look at my article, How to get the best from your Bearings.


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★ Radio Controlled Model Accessories: ★
Gas/Nitro Engines
Nitro Engines
Bearings and Bearing Sets
Bearings
Body Shells
Body Shells
Radio Transmitters etc
Radio Equipment
Tires - Touring, Buggy, Truck, Monster Truck, Rock Crawler
Tires
Wheels/Rims - Touring, Buggy, Truck, Monster Truck, Rock Crawler
Wheels
Electronic Speed Controllers
ESC
Battery Packs
Batteries + Chargers
Electric Motors
Electric Motors






Hints and Tips

Radio Gear

How to avoid Interference.


1/  The first consideration when installing your Receiver into your Electrically Powered Model is to make sure it is well away from the Negative Battery terminal, and the Motor. The Magnetic field can cause stuttering type interference at times of high current draw (i.e., Fast Acceleration)

2/  Make sure the Ariel tube is long enough for the Ariel wire. The tip of this wire is highly sensitive and should be as high, and as far away from the Motor as possible (yup, its that magnetic field prob again)

3/  If all else fails, a simple tip that often works for all RC Model enthusiasts is to wrap the receiver in Aluminium Foil, to shield against any magnetic and external radio interference.

4/  As a last resort, to protect against servo twitch, try ferrite beads. (available at Radio Shack or Maplins) These are threaded over the red, white (or yellow) and black wires of each servo.

5/  If you are using a FET Servo, the installation of a choke (a small electrical component) in the positive feed wire will smooth out any current spikes and reduce the possibility of "servo twitch".

6/  Another thing you might try is a "glitch buster" or "stutter stopper". Basically, this is a capacitor that simply plugs into your Radio Receiver and attempts to keep a level voltage supply to the Radio system.

For More Setup Information check out my Hints and Tips page.








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