Saturday, March 15, 2014

Pinewood Derby - Propeller powered

A week ago my brother invited me to join him for an Anything Goes pinewood derby race. I have great memories of building these cars with my Dad and wouldn't pass up an opportunity to relive those moments.

First I designed my car in Sketch-Up, and then built the car from a standard derby kit. (see image below)

The hardest part was building the propeller motor stand. I made that part separately and the glued it into place. Before I could glue it I had to drill holes and feed the wires for the motor through the holes.

Then to power the motor I used an old iPhone 4 battery I had laying around. To make the battery easier to use I soldered a new connector on the battery so I could easily plug it into the car and the battery charger. To finish the simple circuit, I added a switch so I wouldn't have to disconnect the battery to turn it off.

And finally, to finish things off I added some tungsten weights to a cardboard cover painted to match the car.

I say the finished product always looks better than the sketch.


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