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Post by Hyperdrive on Feb 26, 2011 19:38:05 GMT -7
My local boy scout council is holding an unlimited type class PWD race after the normal cub scout race is done.
The only rules I have to follow are: 1. The axle location and spacing have to be like pure stock 4 3/8" apart and have to be in the stock location as they are located on a BSA derby block out of the box. 2. The car dimensions have to be the standard stuff: 7" long, 1.75" wide for body (2.75" with wheels on), 3/8" clearance, and maximum 2.75" height.
They don't state it but I'm sure they expect the body to be made out of wood. So the obvious thing to me is to use the jewkes needle axles and some razor wheels to maximize speed. However, their is no weight limit on the car, it can be ten pounds if you can make it that heavy. What I'm wondering is how much weight will be realistic to load up on Razor wheels and needles axles without causing damage to them. I've seen one race that limited the cars to 1 pound but they ran on big axles and stock BSA wheels and could easily withstand the stress.
Thanks for any advise,
Hyperdrive
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Post by P D D R 2 on Feb 27, 2011 11:17:01 GMT -7
My local boy scout council is holding an unlimited type class PWD race after the normal cub scout race is done. The only rules I have to follow are: 1. The axle location and spacing have to be like pure stock 4 3/8" apart and have to be in the stock location as they are located on a BSA derby block out of the box. 2. The car dimensions have to be the standard stuff: 7" long, 1.75" wide for body (2.75" with wheels on), 3/8" clearance, and maximum 2.75" height. They don't state it but I'm sure they expect the body to be made out of wood. So the obvious thing to me is to use the jewkes needle axles and some razor wheels to maximize speed. However, their is no weight limit on the car, it can be ten pounds if you can make it that heavy. What I'm wondering is how much weight will be realistic to load up on Razor wheels and needles axles without causing damage to them. I've seen one race that limited the cars to 1 pound but they ran on big axles and stock BSA wheels and could easily withstand the stress. Thanks for any advise, Hyperdrive This car pictured below we built uses JE - BSA HoleShots with bearings and bearing Axles.. The cars weight is 8 oz. When constructing and tuning this car we found the weight limit on this set up to be around 8 oz any more weight the car would slow up a bit. Also the more weight on these axles going through the transition can bend them depending on which type of track you are using. There is some serious down force being applied to the car going the the transition. (curve to straight section) Also one thing to consider when building a car with allot of weight. Is the stopping area good enough to handle the extra speed and weight that these cars will have? Will the car be able to stop in this area without smashing into the end wall or jumping through the pillows, foam or what ever they are using? Remember once you have all that extra weight moving it takes allot more force to bring it to a stop than a lighter car... So be careful and consider all factors before building one of these cars JE - BSA HoleShots with bearing / JE bearing axles / 8 oz weight limit /
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