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Post by campbell7110 on Oct 24, 2009 19:55:30 GMT -7
Our pinewood derby blocks include 3/8" dowels, hard wheels and screws (basically an S&W block). I am wondering if you my have any ideas that i can try to tune on. We can use extended wheel base, shaved wheels and we can weigh 6 oz.
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Post by W Racing on Oct 24, 2009 21:27:39 GMT -7
You really want CBD or LA to answer this post )(Perhaps others as well) :-) However I looked around on the web and found the following: If rules allow a diffrent kit post that info here. (Probably not an option). Balance the wheels. Run the wheels straight and not canted. Drill the holes well. "The Block"  can really help out. To use the block simply mount the axles in the wood with glue and then clamp the whole thing to the block.... Should guarantee a strong finish by using the block. Grab the block from JewkesEngineering or MB4hire. Get sample wheels and try various polishes to make sure they do not turn the bore white. Novus 2 is likely a good start. General tips that should apply to all Derby Cars in general. Use Hobe-e-Lube. Place COM at 3/4". Raise one wheel if you can. Place the rear axle as far back as rules allow. Keep wheelbase as long as allowed. Lighten wheels for sure. Holes in wheels bad. Holes in car body bad. Try and place 3.5 ounces (Actually 4.5 ounces because you can go to 6 ounces) or more of concentrated weight near the back of the car. Car should weigh 6 ounces. Assuming the track has a rail to straddle and that rail is 1 5/8" then make the rear dowell 1 3/4" and make the front narrower so that the wheels will just strattle a 1 3/4 piece of wood... Assuming you can narrow the axles... |
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Post by campbell7110 on Oct 25, 2009 21:50:45 GMT -7
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Post by W Racing on Oct 26, 2009 21:07:58 GMT -7
Looks like that is the kit then.  Space the wheels at 1/32 is the only additional advice. Also the front end narrowing might be too extreme if the wheels wobble a lot. Hopefully that is not the case. A narrow front end keeps the rear wheels of the rail. The rear wheels have most of the weight on them. |
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Post by ACME Racing on Oct 27, 2009 14:28:17 GMT -7
Looks like to me if you cut those dowels at 1.75 inch and glue them into the body - you could clamp it to the BLOCK for drilling. Can you take that wood block and lay it side ways and rip it to 1.75 inch? Then you could drill with the BLOCK and stick your wheels on.....
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