ActionCar pinewood edition

by TimEdwards, published

ActionCar pinewood edition by TimEdwards Mar 6, 2013
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This is a mashup of Patrick Prosic's ActionCar STL (thing:249) as a shell to fit over a standard pinewood derby block. The wheelbase is shorter than the standard cuts made on the block in the official pinewood derby kit, so one of the axle slots on the wood block will need to be re-cut. Other than that, the wood block requires only a few straight saw cuts to fit the shell. All dimensions are legal according to official pinewood derby rules.


Print with support structures underneath. One of the photos shows the underside of the piece with honeycomb support at 7mm spacing. It looked difficult to remove but turned out to be surprisingly easy. An OpenSCAD file is included with the downloads, but requires the STL file from thing:249. Otherwise, just download and print the STL.

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This year the official rules prohibit the use of mercury, lead shot, or anything else that is loose inside the body. The full plastic shell is in full compliance with the official rules, although, as you mention, individual troops can apply their own rules as they see fit. As it is, a lot of weight is in the shell, and it is not optimally distributed for the best speed. But it will be a great looking car!

I remember when I was a cub scout. There was big controversy if certain ppl in the troop were using mercury as a weight. The idea is that the mercury shifts as it hits the bottom of the ramp, giving it an extra oomph of propulsion.

Another thought. You may want to make that smoother for less wind resistance. Try an Acetone Vapor Bath http://www.soliforum.com/topic/165/acetone-vapor-bath/http://www.soliforum.com/topic...

I never thought I would see the day. No longer will pine wood derby cars be just cuts of wood with led weights and plastic wheels. Btw, some troops only let you use what is in the official pine wood derby kit.