The race format did not allow the kids to touch their cars from the finish line until the whole think was over. When we collected the car, the wheels still rolled true, but there where three distinct gouges on the inside of the "up" wheel in front, and one gouge on the rear wheel on the same side. There is no question the gouges came from impact with the aluminum track.
I was less than impressed with the stopping zone they had this year, which consisted of a bean-bag pillow over the track, and the cars were hitting it pretty fast.
What I wonder is if this kind of gouge problem is because we didn't use a rail-rider setup to keep the moving wheel on the rail? Maybe the car drifted in harder from the start of the fifth race due to being being set down off center or askew, which then marred the wheel and led to the skips in the last race. Or was it more likely to have been gouged at impact at the stopping section from bouncing around when it hit the bean bag pillow? I've never had this happen to a car I've built so I wonder was there something wrong with the track, or is this a common risk when you build a car with one wheel up and not set it to rail ride?
Thanks for the pic! Was this an aluminum track? I am not sure of the type of kit from which you are building; some kits have wheels made from softer plastic, so that might also be factor.ziggysdad wrote:is this a common risk when you build a car with one wheel up and not set it to rail ride?
I might guess this is impact damage from the stop section given its severity. Perhaps there was something relatively sharp under that pillow. We've never seen this before, so I can only speculate. I would be inclined to ask if others racing that day experienced similar damage, or inquire of the trackmaster; they might have their own insights.
When it happened twice on the next run in the flat, I though this car might be "bouncing" up when hitting the bean bag, then landing hard on the rail edge, rather than nose diving down between the track and the bag, as a wedge car would tend to do.
I can't think of anything except the rail that would have made contact with the part of the wheel, but it's always possible... I know they had a padded stopping box last year that the cars coasted into at the end of the track. Why mess with a good thing??
- Stan Pope
- Pine Head Legend
- Posts: 6888
- Joined: Sat Jul 05, 2003 7:01 pm
- Location: Morton, Illinois
The wheels appear to be of a softer plastic, which gives a "fuzzy appearance" when sanded.
To create a ding like that the wheel must have hit a high, sharp corner. At least the top corner of the center rail at a transition and perhaps in the braking section where the corners are almost even wth the axles.
While the car was tuned to run straight, when it was running on this track, it was biasing toward bringing the problem wheel into the rail, although not nearly as strongly as if the car had been tuned to guide by the rail. (Or, perhaps, it was that the car was staged a bit off in direction.) A properly tuned rail guide wheel would probably not suffer such a wound on that track!
"If it's not for the boys, it's for the birds!"
- Site Admin
- Posts: 4689
- Joined: Fri Jun 20, 2003 12:46 am
- Location: Highlands Ranch, CO
Or more appropriately, the fault of the person setting up the track. The center marks on that track make it very easy to see if the lanes are aligned with each other. If not, it is pretty easy to make an adjustment.arrell wrote:My two cents says that it was most likely the fault of the track sections being misaligned at the joints (which I believe was said before).
It is pretty easy to tell if a track section is reversed. Since each lane is tongue and groove, so the tongues of all lanes should be on the same side of the track and the grooves on the other side.arrell wrote:The track cross section allows for a pointed edge to protrude into the lane (inside of the wheel) when improperly misaligned. Adding to the problem could also be the fact that the track sections may have been bolted together opposite in orientation to what they should be. Note the image on the included link (Car Guides). The finish side of the guide is often tapered at the joint. If for some reason the track section was reversed the track misalignment could cause a sharper point to protrude into the lane. Not to fault your track setup people either, as it even may have loosened during the race. A hard hit, your car hitting it, may have made it looser. My advice would be that if you haven't already been involved with helping your group run the race and setup the track, get involved and be certain the track gets aligned next time. I know from plenty of experience myself it takes a lot of time and people to get these races running smoothly and without track problems.
For the track that I use, I have colored the center of each lane with colored electrical tape, so it is even easier to tell if the track sections are laid out correctly.
Awana Grand Prix and Pinewood Derby racing - Where a child, an adult and a small block of wood combine for a lot of fun and memories.
If they allowed car owners to stage cars, perhaps your son would have caught it and alerted race officials.