Yesterday was a great day in the history of Pinewood Derby cars at the Ring household. I knew it was going to be a good day after only two races when both Thomas and Graham came in first with a big lead.
The track that we race on has four lanes with electronic timing. Each car gets to race on every lane in order to minimize the impact of slower/faster lanes. A computer schedules all the races and tabulates the time for each car. At the end of the round-robin tournament, each racer has four times that are added together. The two lowest total times are chosen as 1st and 2nd place for each of the four dens in our pack. These winners may all participate in the regional competition. The eight den winners then compete for the honor of best in the pack.
After the round-robin, Thomas and Graham were both first in their den and participated in the pack championship round. Thomas took first in 3 out of his 4 races, but Graham didn’t fare as well in the stiffer competition. Graham finished 4th or 5th in the pack and Thomas finished 1st!
I went to the post office in the morning to make sure that both cars were regulation weight (no more than five ounces), and so we had some last minute weight stuck to both cars. Both boys had two golf club weights on their cars because they are light enough to get you very close to regulation weight (more weight means more speed). In these pictures, they are the flat, rectangular weights that are light silver in color. On Graham’s they are mounted vertically (at his insistence) and on Thomas’ they are are flat against the body near the rear (by the fin):
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During one of the two races where Graham and Thomas raced against each other, all four weights came off their cars. Evidently, that had been happening to Graham’s car for awhile, so the race official just slapped all four onto Graham’s car where they remained until after the racing was all done. When I picked up Graham’s car after it was all over, I was perplexed to find the extra weights on the car. I couldn’t figure it out until I saw Thomas’ car without the weights and then it all became clear.
I weighed Graham’s car right before we left and it said 5.4 ounces, which might have been a big advantage to Graham, but probably was also a disadvantage to Thomas. Or was it a disadvantage? Physics experts, please weigh in!
There are more pictures here.
Tina’s blog entry is here.