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pinewood derby cars
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<blockquote data-quote="Earl Thigpen" data-source="post: 295851" data-attributes="member: 3999"><p>My Son's cars also came in first and second in two years competition. </p><p></p><p>Here's what he did (with advise from me):</p><p>1. Deburr and polish the axles. Pay attention to the "flashing" under the head of the brad. Minumize the axle contact area with the bore in the wheel. Less contact area, less friction, faster car.</p><p>2. After all finishing has been completed bring the weight up to the limit allowed. Use lead placed in a hole near the center of the car.</p><p>3. DRY graphite all four axles every day for two or three days before the event.</p><p>4. Make sure the wheels are smooth and round. This is kinda tough because I think the rules have changed these days to limit what you can do to them. (My Son put a crown on them so that there was only a "line" touching the track). I think you are allowed to run some cambur these days but not real sure.</p><p>5. Make sure the area of the car (wood) that comes in contact with the inside of the wheels is VERY hard and smooth - and slick. (Think epoxy or washer)</p><p>6. Don't know how much aerodynamics plays at Pine Wood Derby speeds but it wouldn't hurt to make the cars slick and wedge shaped.</p><p>7. Last, but very important. When my Son was doing this the kids were allowed to place the cars on the starting line. ONE SIDE OF THE TRACK WILL ALWAYS BE FASTER THAN THE OTHER. Be observant.</p><p></p><p>Good luck and have fun!</p></blockquote><p></p>
[QUOTE="Earl Thigpen, post: 295851, member: 3999"] My Son's cars also came in first and second in two years competition. Here's what he did (with advise from me): 1. Deburr and polish the axles. Pay attention to the "flashing" under the head of the brad. Minumize the axle contact area with the bore in the wheel. Less contact area, less friction, faster car. 2. After all finishing has been completed bring the weight up to the limit allowed. Use lead placed in a hole near the center of the car. 3. DRY graphite all four axles every day for two or three days before the event. 4. Make sure the wheels are smooth and round. This is kinda tough because I think the rules have changed these days to limit what you can do to them. (My Son put a crown on them so that there was only a "line" touching the track). I think you are allowed to run some cambur these days but not real sure. 5. Make sure the area of the car (wood) that comes in contact with the inside of the wheels is VERY hard and smooth - and slick. (Think epoxy or washer) 6. Don't know how much aerodynamics plays at Pine Wood Derby speeds but it wouldn't hurt to make the cars slick and wedge shaped. 7. Last, but very important. When my Son was doing this the kids were allowed to place the cars on the starting line. ONE SIDE OF THE TRACK WILL ALWAYS BE FASTER THAN THE OTHER. Be observant. Good luck and have fun! [/QUOTE]
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