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1/10 Scale Electric Truck/Truggy:

Ofna Jammin SCRT10 - # 34975 / # 34976 (Radio Controlled Model Review)


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History, Info (and How To Set-up Tips) for the Ofna Jammin SCRT10:


  Developed by Jammin, manufactured by Hong-Nor and distributed by Ofna in 2009, the 4x4 Jammin SCRT 10 Short Course Truck - # 34975 - came 80% assembled, without electrics, or RTR - # 34976 - with a motor, ESC and 2.4Ghz radio system.

  The model is shaft driven, on an alloy plate chassis, with gear type differentials, coil spring over oil filled dampers, anti roll bars, rear dogbones, with front universal joint drive-shafts and a full set of ball bearings.

Ofna Jammin-SCRT10
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  To race the Ofna Jammin SCRT10, it must be fine tuned to improve handling, provide responsive steering and give you the grip to cruise around corners at high speed, without slipping off the track. Small adjustments can make a Big difference and our step by step procedure, will guide you to the best Set-up for your individual driving style.

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★ Ofna Jammin SCRT10 Truck Chassis ★
Ofna Jammin SCRT10 Truck Chassis

★ Ofna Jammin SCRT10 Truck Chassis ★
Ofna Jammin SCRT10 Truck Chassis


Buying a Used Ofna Jammin SCRT10 Truck (and What to look for)


   Buying a used Ofna Jammin SCRT10 Electric Truck, 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 Ofna website, or purchased separately on eBay. With an instruction manual, any problems with your model Truck you may discover can easily be fixed.

Dampers
   When you receive your used Ofna Truck, make a general visual inspection of the chassis, front and rear wishbones, suspension shock towers etc, for any broken parts 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 Ofna 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 Ofna Jammin SCRT10 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 Jammin SCRT10 model, fit an under guard to stop dirt and gravel entering the chassis.

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

   If you intend to race your Jammin SCRT10 Truck model at a competitive level, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

   The gearbox of your used Truck 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, if you intend to race your Truck at a higher level, this should be removed and replaced with racing oil (ZX1 or Teflon Oil). Of course, this should be reapplied after each race meeting.

Spur Gears
   Gears are a weakness on all Truck 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 Electric 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 Electric Motor mount and remember to check them for security after every two or three runs.

   Ball joints always cause problems. For top level Electric Truck racing, the plastic ball connectors should be checked and if deemed necessary changed after every meeting. A simple thing like a loose fitting connector popping off could easily end your race, so better safe than sorry.

Servo Gears
   The Jammin SCRT10 steering servo is also prone to damage. In high speed crash situations, 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 body roll on your Ofna Jammin SCRT10 is a problem, handling can be improved with the use of stabilizers, anti roll or sway bars, stiffer tuning springs and, or, thicker silicone oil in the dampers.

Ball Bearings
   If your used Ofna Truck comes with plastic and sintered brass bushings (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.

   Finally, good luck with your Jammin SCRT10 model and good racing.


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Or, check out our RC Model Car Setup Guide


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Manufacturers and Brands Catalogued and Listed by RC-Scrapyard.


   At present, the RC Model Manufacturers, Brands and Distributors covered by us are: ABC Hobby, Academy, Acme Racing, Agama Racing, Amewi, Ansmann Racing, ARRMA, Team Associated, Atomic RC, Axial, AYK, Bolink, BSD Racing, Capricorn, Carisma, Carson, Caster Racing, Cen, Corally, Custom Works, Durango, Duratrax, ECX - Electrix, Exceed RC, FG Modellsport, FS-Racing, FTX, Fujimi, Gmade, GS-Racing, Harm, HBX, Helion, Heng Long, Himoto Racing, Hirobo, Hitari, Hobao, Hong-Nor, Hot Bodies, HPI, HSP, Intech, Integy, Jamara, JQ Products, Kawada, Kyosho, Losi, LRP, Maisto, Mardave, Marui, Maverick, MCD Racing, Megatech, Mugen, New Bright, Nichimo, Nikko, Nkok, Ofna, Pro-Pulse, Protech, PTI, RC4WD, Redcat Racing, RJ-Speed, Robitronic, Schumacher, Seben, Serpent, Smartech, Sportwerks, Step-Up, Tamiya, Team-C Racing, Team Magic, Thunder Tiger, Tomy, Top Racing, Traxxas, Trinity, Tyco, Vaterra RC, Venom, VRX Racing, WLToys, X-Factory, Xmods, Xpress, Xray, XTM, Yankee RC, Yokomo, ZD Racing and Zipzaps.

   This is an ongoing project, with new and "lost in time" RC Model Brands being added as they are found and although most of those listed above have been covered in relative detail, some are still being researched and will be completed in the near future.


















My First National

   When I first started in RC, way back in the late 1980s, I would turn up to the weekly club meeting, with my Tamiya Boomerang, transmitter, two sets of crystals, a couple of batteries, a charger and a tool box with a wheel spanner and a few spares.
   It was three five minute qualifying rounds and a final and every month we would have a trophy meeting. The trophies were donated by a two of the older semi professional guys who basically ran the club and over the years had collected what must have been hundreds of trophies and had no space for them anymore. The lure of a trophy always brought out the "not as enthusiastic types" and the small church function room was always packed on those nights.
   About a year in, my collection of B final trophies was beginning to clutter my room and my dad bought me the new Tamiya Manta Ray. That was the big turning point in my RC career.
   From then on it was A finals all the way. Then one day in the summer of 1992 the club organisers (the semi pro guys) asked me if I would like to go to a BIG national meeting way down south in Malvern. I asked my dad and with a bit of prompting he said "why not".
   When we got to that meeting we found there were around a hundred competitors, with ten groups of ten. I was in group "H". a two of my friends went down with us and they were in group "I" so were on just before me.
   I remember that first race like it was yesterday. It was a staggered start and I was away next to last. I had never raced on a proper outdoor dirt track before. My only experience was on indoor carpet, but my old Manta Ray took off like a bullet. Most of the others in my heat were rookies and by the end of the third lap I was up with the leader. He was good very good but I stuck to him like glue. Each twist, turn and jump brought me closer and closer, this guy was fast, but I was faster for a while anyway. A lap before the end my old over worked 1400mah battery, was struggling to give me what I needed to keep up with him and my buggy got slower and slower. I ended up third in that first race, but wasn't about to give up that easy.
   There was a shop at the meeting and straight after the race I nagged my dad to get me a new battery. In those days money was tight and normally before dad would spend anything he would consult my mum, but this time she wasn't there and after watching my performance in that race he didn't need much pushing to get me that badly needed new battery.
   Waiting for the second round seemed to take an age, but when it arrived I was pumped up and ready with steely determination. I was away third after finishing third in the first round, so my duel with the guy who beat me before carried on where it had left off. Two laps in and I was on his tail. He wasn't going to beat me this time. We lapped a couple of back markers and were quickly catching up to a third. He slipped past him in a flash, but when I moved in, the idiot drove straight into me, knocking my Manta Ray on its back. The marshal was oblivious to my plight. I shouted my head of but the marshals eyes were fixed on what I guess was the car of one of his friends in my race. The next thing I saw was my dad, bounding across the track like a gazelle, picking up my car, putting it on the track and giving me the thumbs up. I drove like the wind, passing car after car, slowly working back up to third, where I eventually finished.
   But it didn't end there. Because my dad had ran out onto the track, I was disqualified we pleaded our case and eventually were allowed to continue.
   The third round heat arrived. This time I wasn't going to let anything stop me. My focus was to win that race and beat that guy who had all the luck so far. Because of the previous race I set off last. Car after car was left in my wake, until once more it was me against him. Mano a mano, he saw it was me and he upped his game. Lap after lap we duelled for the lead. Coming into the very last lap I was a nose in front and pulling away. With each corner I could sense the battery was once again giving up and my car started to slow down. Corner after corner I could see him getting closer and closer. we got to the final straight and he was right on top of me breathing down my neck. I held my breath and jammed over the throttle leaver and just crossed the line before him I had won my first national heat race. and it wasn't to be the last.

Check out our RC Model Car Setup Guide






Hints and Tips

Battery Connectors

   Over the years I have been racing radio controlled model cars of all descriptions, I have tried a number of different connectors for my batteries.

   My first car was a Tamiya Boomerang and of course the batteries I used all had the standard Tamiya connectors, which were fine with the kit supplied 27T silver can electric motor, but I soon discovered their problem when I installed my first Modified motor. The high current demands of the motor created so much heat, the plastic surround of the connectors melted and fused together. No matter how I tried they could not be disconnected. My only option was to cut the wires.

   From there I moved over to Corally connectors, commonly referred to by many now as Bullet connectors. Comprising of a short length of 4mm gold plated tube at one end and what looks like what we used to call a Chinese lantern fitting that slotted inside the tube, also gold plated. Although they were highly efficient and reasonably easy to install and use, I never really took to this type of connector, I think it was the fact that there was always the possibility of the positive and negative being connected wrongly in poor light and also that if positioned side by side, each connector could work loose and become exposed, leaving the possibility of a short circuit.

   Then I remember buying some second hand batteries at an area meeting one day, they had these little red block connectors I soon learned were "Deans" rated at around 40 Amps. They looked like just what I was looking for so I gave them a try. They worked fine, although I didn't like the shortness of the part to be soldered. However, for about two years they were my connector of choice, until I stumbled across an advert in the "Radio Race Car International" magazine.

   The latest development in connectors at that time were named "Power Pole", made by a company called Anderson and were rated at 45 Amps. The design uses a small tube, plated with silver, with a short extending lip, that slots over the exposed wire and can either be crimped onto the wire or soldered. For safety and efficiency, I prefer the latter. To complete the connector, a colour coded plastic cover fits neatly over it.

   It was way back in 1995 I first used Power-Pole and to this day they are still the most efficient I have come across and never overheat.

   So, if you are looking for a connector to change over to, that has a high current rating and won't cause you any overheating problems "Anderson Power Pole" is the one I recommend.

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










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