[KensRedZed]

Part 6: Tuning.

The all up weight is just over 130-grams. The target weight is 140-grams.

   

A piece of 2" inch brass by 0.032" thick does the trick nicely. Cutting a piece just over an inch wide should give about 10-grams of weight.

A line is scribed down the center of the chassis, and the brass weight. The mating surfaces are rough sanded with 150-grit sandpaper, and wipe clean. Then the weight is epoxied to the chassis with both lines lined up. A clamp is used to keep it in place for 5-minutes.

   

The weight hangs under the chassis at about 1.5mm off the track. Stick-on lead weight can be added to the top of the outer wings if needed.

   

Urethane washers that properly fit the 4-40 screws were purchased from DArt Hobbies.

   

This is the tricky part. Setting/keeping the washers in place while installing the chassis. Practice makes perfect.

   
   

Success!

   

The final step is important. The screw needs to be somewhat tight and allow a little body float. It will get loose over time. A good piece of tape is required to prevent the body screw from backing out during racing.

   

You're ready to race. Don't forget to oil the bearings.

Tire profiling is also very important for tuning and handling. But, that requires another thread altogether.

Thanks to everyone here for your patience.

I hope this inspires a few friends to complete their new cars.

Ken