Here is the deal with fray cars. There are no traction magnets. But the motor mags are so strong, and the car sits so low that they act like traction mags. Combine that with the lowness of the overall car and the width of the car (1 and 5/16''). And the SUPER STICKEY tires. And you end up with a super tjet. One point though, the rules say no open wheel bodies. But all of the ones I have seen have the tires sticking out like those slammed cars you see on the streets now and again. Can you run a body that covers the tires? There is a track near me that runs what they call Big Block Fraycars. I havnt seen them but I understand they are a fray car with low ohm armatures and a bigger gear on bottom of the gear plate (14 tooth?). Idont know if the standard frays run that gear, but if they dont then the Big Blocks ought to be something indeed! SLO.
Thanks Mr. King! I was having Deja Vu there for a minute.
Fray cars often have the tires sticking way out, but they don't have to. Most do that to run the smallest body, and thus the lightest body, as that is one of the biggest factors in handling of the cars. Many have "fat" rocker areas to get the CG down even lower. Here is a picture of another one I make, that has this feature, a Lexus SC-430. Some groups allow this, some don't.
I'm often torn as a modeler by wanting to run something that looks more realistic, and I sometimes do. Some would argue that a "full" body car, that doesn't let the tires stick out may race better in a pack of cars, so you aren't as likely to touch wheels, and flip etc. There is some truth to that!
In the "official" Fray race, I think they only allow the 9-tooth rear pinion, but many groups that race "fray" style cars allow more options. In MASCAR, we allow 9,10,11,12 and 14 which is great to have that option.
You can spend a pretty penny on building a Fray car, but I do pretty darn well staying on the cheap side, and am often competitive with a $30-$40 car. Personally, I'm still wrecking a little too much to need a much better car.
These cars are really fun to drive, but I'm probably a little spoiled to be racing with such a great group. Lots of help, and if you really stink, you can borrow a darn good car from one of the other folks!
The Fray at Ferndale is a yearly race for modified Aurora Thunderjet cars. Many clubs race similar cars. The cars all have silicone on sponge rear tires and use a weighted brass front end. The bodies are usually resin and are optimized for racing. The various parts are carefully selected for the best performance.
Here are some of the cars that HOCOC runs, the ones in the back rows would be more typical of Fray types.