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The only thing we did not do was tap the plastic wheel hubs. We picked the fastest car to enter the race. (4 completed) We did everything in the video including the dynamic wheel alignment tool and test track.
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We loved watching it over and over in the garage while making our 6 test cars. It has been a wonderful educational tool for us. Next year I believe he can do it all except melt the lead. This is our 3rd year and each time my son does more of the construction on his own. YEAR 3 - Scott: my son and I watched our video again, and worked the science to win 1st place Bear and 1st place overall in our Pack today. Thanks for making the PWD a great educational tool. Just as you teach in video, the other cars poop out towards the finish line and my son's car scoots ahead to win. It's all about the science!!! Using your physics principles my son is the Grand Champion 2 year running. YEAR 2 - Scott: thanks to your physics lessons my son won 1st place Wolf and Overall Champion at our District Race today. Scott, thanks again for making this a fun and educational exercise for us. My first grader was telling all the Scouts about the center of mass on his car! He really got into this, and his physics teacher/electrical engineer grandfather did so as well. Just like you mentioned in the video, as the other cars would poop out toward the finish, my son's car would cross the line first. Today was the district race and I am pleased to tell you that we won 1st place in the Tigers and Overall Grand Champion for the Eastern District of the Andrew Jackson Council. My son and I wanted to fine tune your concepts for the District race, so we built another car. That was done (with your help) by the car on the left. YEAR1 -Scott: Back in February I told you about my son winning 1st place in the Tigers and 3rd overall at our Pack Pinewood Derby. In closing, thanks for your work in putting together the video and helping this father son team to build a fast car loaded with learning. So if you have any suggestions they would be greatly appreciated. We’ve already started looking toward making next year’s design a little different. Josh really enjoys the axle prep and watching me pour the lead. To make it a little more interesting I’m almost certain the second place car was one bought on Ebay from the ‘Physics Teacher’ (I haven’t let my son in on the secret source of that car). I really enjoyed your tests to prove the theories.We were both super excited when Josh took first place in the pack this year. At 8 years old I see some of the concepts beginning to take hold – I’ve stressed how important doing your homework and the design is what leads to a fast car. So we pulled out the video and started it again. When I asked what kind of car he wanted to build this year he said “one like last year”. Last year he took first place in the pack. Last year I found your video while looking for a way to teach my son the science behind building a fast car.