[PxTx]

With proper polish and lube, the coefficient of friction is less against the head of the axle than then the wheels scrub the body. It will be impossible to keep t. wheels off both side the whole way down. I'm not gonna say you can't come up with a faster method, but it would be wise to start with your first build utilizing the best practices.

I have done clear nail polish, then graphite where the hub could rub.

5 oz is the max allowed. Heavy is fastest. Most of the scales will only read in tenths. You could try and get it to 5.04 oz with a means to subtract if nessisary on race day. Fwiw, around 8 - oz starts causing too much friction on the wheels.

Don't know about precut. The kits years ago had a notch for like the driver's cockpit.

Yes, build several cars.

You can simply use a small wood plank as a ramp and measure how far you can get it to roll. Use a string and a treadmill to check aligment. We have an old wooden track you are welcome to test on.

Tear down is unlikely. You don't want to subject a kid to that. They might have an informed visual inspector.


Ask your friends in the pack what kind of track and timing they use. I suspect with those rules it will be an aluminum track with digital timing and et display. My wood track is just a win light on each lane.