RCScrapyard ► Iconic Vintage Radio Controlled (RC) Model Car Archive ► Tamiya Rahal-Hogan Motorola Lola T94/00 Honda. ITEM #58148 F103L
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Tamiya Rahal Hogan Motorola Lola T94/00 Honda - #58148 (Radio Controlled Model Review)

1/10 Scale Electric Indy Car - F103L Chassis:

  Released by Tamiya on November 29, 1994, on the F103L chassis, the Rahal Hogan Motorola Lola T94/00 Honda was the car driven by Mike Groff in the 1994 Indy car season.

Tamiya Rahal-Hogan Motorola Lola T94/00 Honda - #58148 F103L
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  Based on the F103 chassis, the F103L has a longer wheelbase and to give the chassis more rigidity it employs a double deck configuration.

  Like the F103, the F103L chassis has a number of changes from the old F102 chassis. The chassis plate and motor mount were re-designed, a two part upper deck was added and a friction damper coupled with a damper plate assembly was included and the steering servo re-positioned.

  In the old F102 the steering servo was laid on its side, this meant the tie rods were different lengths, giving the car a different turning circle on the left to that right. In the F103L, as it is in the F103, the servo is held upright in a fixed frame, allowing the rods to be of even length, giving equal turning circle and improved steering.

  In conclusion. I never actually raced the F103L chassis, but by all accounts the design worked well.


      Rating: 3.53.5 Stars out of 5 Reviewed by: RCScrapyard     Manual.

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Tamiya Rahal-Hogan Motorola Lola T94/00 Honda #58148 F103L - Chassis
Tamiya Rahal-Hogan Motorola Lola T94/00 Honda #58148 F103L Chassis
Tamiya Rahal-Hogan Motorola Lola T94/00 Honda #58148 F103L
Tamiya Rahal-Hogan Motorola Lola T94/00 Honda #58148 F103L Body Shell

General Information and Advice

   For those starting in Radio Controlled Racing, here are a few Hints and Tips: Firstly, buy a Kit not an RTR. That way, if something breaks you will have some idea how to fix it.

   Radio Controlled Model Cars are very fragile and easily broken. The main parts to protect are the Front Wishbones, Suspension Shock Towers, Dampers, Hub Carriers, Kingpins, Uprights and Toe in Blocks, so make sure you have a good strong front bumper and Lexan or Hard Plastic Body Shell and if available for your model, a protective under tray, to prevent grit and dust getting into any moving parts.

   The Steering Servo is also a weakness in high speed crash situations, so get yourself some good strong Servo Mount and Servo Saver. Also I would recommend Titanium Shafts, Turnbuckles, Tie Rods and pivot/steering shafts and if available for your model, lightweight Titanium Drive shafts, dog bones and CVD (Constant Velocity Drives). The standard steel types are far too easily bent.

   Gearing is another problem area on RC model cars. Head on collisions can easily break off gear teeth on Nylon/Plastic Spur Gears and even Bevel Gears inside the Gearbox. Heavy impacts can also loosen nuts and self taping screws that hold the Motor in Position, allowing the Pinion Gear to pull out of mesh slightly and rip the tops of the teeth on your Spur Gear. To avoid this to some degree, fit locking nuts and a new motor mount from time to time, so the self taping screws that hold the motor in position have less chance to come loose.

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

   Many New car kits come with Nylon and Sintered Brass Ring type bearings. My advice is to discard these before initial installation and buy a good Hop-up set of Shielded Steel Ball Bearings. Or if you are serious about your racing, Teflon or Ceramic Bearings.

   One final piece of advice about the Setup of your Car. Keep the Centre of Gravity as low as possible. Ride Height is all important. For On Road Drift/Touring cars the Ride Height should be no more than 5mm, for Buggys, Trucks, Truggys and Monster Trucks, as low as possible depending on the track conditions. If Body Roll is a problem, handling can be improved with the use of Stabilizers, Anti roll or Sway Bars, stiffer Tuning Springs and, or thicker Silicon Oil in the Dampers. Also find somewhere to mount the Transponder as low in the Chassis as possible.

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Tamiya Rahal-Hogan - #58148 F103L


Ball Differentials


   Ball differentials were developed in the late 1980s to replace the high friction Gear differentials. Mainly used on Tamiya Touring Cars, Le-Mans and Formula One Cars, Ball Differentials are designed to be totally frictionless and smooth in action to provide effortless drive to the wheels on cornering, where the inside wheels must rotate slower than the outside wheels for controlled stability.

   Basically, the configuration of the Ball Differential is a number of small case hardened steel balls, spaced in a plastic cage that is in effect the drive gear for the axle. On each side of the gear are two hardened and tempered pressure plates that clamp over the steel balls, held in position by a screw through the centre of the assembly, incorporating a small thrust bearing and coil spring. The adjustment of this screw is crucial to the effectiveness of the differentials action. Too tight and the free movement of the diff is restricted. Too loose and the balls will slip on the plates when accelerating out of the corner, not only reducing drive, but damaging the balls and pressure plates not good. The optimum setting is obviously somewhere in between and is where the small coil spring is important. It must be compressed, but not fully, to provide the desired exact pressure required. With a little practise setting up the diff become second nature. Patience is the word for this procedure.

   Lubrication of Ball Differentials is essential for that smooth operation and special greases have been developed that allow the balls to roll freely in the cage and push aside as they roll over the pressure plates.

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



Hints and Tips

Soldering

   In the sport of Radio Controlled racing, there are a number of things you have to learn to get you up there with the best. One of the most difficult, for those with little practical skill, is the art of Soldering.

   For their 540 silver can motors, Tamiya provide two wires, typically green and yellow, soldered to the endbell, with two bullet connectors to plug into the speed controller. While this is fine for bashing around the back yard, if you were to advance to a higher level you will soon find just how inefficient this method is.

   Motor wires are best soldered directly to the ESC. That way no energy is lost through high current draw. Some of the top drivers at one time even used to solder their batteries directly to the ESC, but these days with connectors such as "Deans" and "Power Pole" this isn't necessary but I still wouldn't use any kind of connector for the motor.

   There are basically two kinds of solder. Plumbers solder which is made up of 60% Lead and 40% Tin, where as electrical solder is the opposite 40% Lead with 60% Tin. NEVER use plumbers solder for your battery, ESC or motor joints. Lead melts at 327 degrees C, where as tin melts at 232 degrees C. The higher Lead content of plumbers means it melts at a higher temperature, which is not good for your battery cells. Also, Tin has almost half the electrical resistance of lead, so with the higher Tin content of electrical solder, electricity flows much easier to your motor.

   More recently, due to the European regulations for lead use, lead free solders are becoming more widely used well, in Europe anyway. The problem with lead free is the melting temperature it is much higher, making it difficult to produce reliable joints.

   Lead, as we know, is a poison to the body if ingested or inhaled in certain quantities. so when using lead based solder, try not to inhale any of the fumes and always wash your hands after completing your work. One of my friends also wears cotton gloves, but I find these cumbersome.

   For me lead / tin solder is far easier to use and if used with care, has less potential to damage your batteries having a much lower melting temperature.

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









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