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Post by derbydad3 on Oct 25, 2009 5:56:54 GMT -6
I just read in a Maximum Velocity Pinewood derby guide that on tracks longer than 50 feet to have the center of mass at 1 1/2 to 1 3/4. This seems contradictory to everything that I read on here. We are getting ready to build cars for this PWD. In the pack we have a 50ft aluminum and at districts it is a 50ft wooden (Very well maintained and level). We will be building two cars. One stock and the other modified. On the modified it can be up to 9oz. I have already drilled the holes for a modified with and extended wheel base. The holes are 11/16 from each end. Would a 3/4 to 5/8 be to agressive? what would you reccomend?
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Post by Lucky 13 on Oct 30, 2009 18:14:10 GMT -6
I just read in a Maximum Velocity Pinewood derby guide that on tracks longer than 50 feet to have the center of mass at 1 1/2 to 1 3/4. This seems contradictory to everything that I read on here. We are getting ready to build cars for this PWD. In the pack we have a 50ft aluminum and at districts it is a 50ft wooden (Very well maintained and level). We will be building two cars. One stock and the other modified. On the modified it can be up to 9oz. I have already drilled the holes for a modified with and extended wheel base. The holes are 11/16 from each end. Would a 3/4 to 5/8 be to agressive? what would you reccomend? DerbyDad3, Will you be RailRiding ? Do you know exactly what type of tracks you will running on ? Best Track, Micro-Wizard ? Is the track 50ft or the racing distance 50ft ? I would stick with a 3/4 com on the stock car. With the modified being allowed to weigh 9 ounces, you will probably have a hard time getting a 3/4 com and still keep a stable car because you would have so much weight on the back of the car. You will probably end up having to go with a 1.25-1.50 com to get that much weight in the car. Since the track you are racing on is 50ft, not over 50ft, this is the set up I would run. I think the theory on the longer tracks (over 50ft) is that the less aggressive com creates a more stable car and requires less steer to keep it on the rail, which in turn helps the car travel futher without losing energy from the front wheel rubbing the rail as it goes down the track. Lucky 13 |
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Post by derbydad3 on Oct 31, 2009 10:02:39 GMT -6
Thanks for the help, I will be rail riding. I spoke to Randy at Maximum Velocity and he also reccomended just a bout the same thing.
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