Tungsten COG Weight™ - 2 ouncesa
Pinewood Derby Weight

What is Tungsten?

The word "tungsten" literally means "a substance of high density", and is derived from the Swedish language, "tung", meaning "heavy," and "sten", meaning "stone." The name is appropriate as tungsten is a metal with one of the highest densities. In fact, tungsten is 1.7 times more dense than lead. Only gold, platinum, and a few other rare and expensive metals have a similar density.

Applications of Tungsten

Tungsten is completely non-toxic and environmentally friendly so it is gaining increased use in weighting applications where lead is not appropriate. For example lead has been banned in many streams, so tungsten is often substituted for lead weight on fishing flies. The high density coupled with the non-toxic nature makes tungsten an ideal metal for this application.

For similar reasons tungsten is a superior product for weighting pinewood derby cars. Tungsten is 3.2 times the density of the no-lead weighting material often used on pinewood derby cars, thus it enables tremendous flexibility in the design of the car. Coincidentally, tungsten has been used by NASCAR for the metal roll cage and as frame ballast to lower the center of gravity of the race car.

How to Use this Product

Tungsten COG weights are designed to thread into a 3/8 inch (or 23/64 inch) diameter hole. By drilling the hole longer than needed, the position of the weight can be adjusted to tune the COG (center of gravity) of the car.

COG weights can be used individually or as a group. The COG weights nest with each other so that they will adjust together. When using them as a group, it is best to use epoxy or super glue to glue the weights together to ensure that they stay nested. The photo shows two nested COG weights.

The position of a COG weight is adjusted with a 1/8 inch hex key (Allen Wrench). Typically, holes for the COG weights are drilled into the back of the car (see photo) so that the front-to-back COG can be adjusted. Alternatively, holes can be drilled into the side of the car for adjusting the side-to-side COG.

a2 ounce nominal weight - actual weight ranges from 1.95 to 2.05 ounces
Tungsten COG Weight is a trademark of PineCar

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