Intro: Pinewood Derby Video Car (with Suspension)
This year my eldest sons Cub Scout pack had an open division. I believe the cars that the kids race should be their own creation. So after serving as a safety monitor for the creation of the true car. I created a video car with my younger children.
Step 1: Resaw the Pinewood Derby Car Blank
The first thing you will want to do is cut the car blank down to a thin plank.
I made a mark down the car about 1/16 inch above the holes for the axles (nails).
Then I clamped it into a vice and (with a little help from the little ones) cut the car down.
Step 2: Sand the Car Plank Flat
Do not worry if the first cut looks really bad, we will make everything look much nicer with some sanding.
I do not have a picture of the sanding process, but I taped a couple of sheets of sand paper to the table then ran the board back and forth.
Step 3: Make the Cut for the Suspension
I made a mark down the middle of the plank and cut from the front to 1 inch from the back
Step 4: Optional: Modify the Camera
This camera is a bit too heavy to be used in a true competition car. Since was running in an exhibition Open heatâ¦ I knew a couple extra grams would be ok. If you are competing, you might want to consider removing the video out and audio out plugs, removing some of the metal casing to the camera, and even hardwiring the battery connection in directly.
I did not modify the camera because I wanted this to be a temporary mounting. This camera has a lot more adventure coming before it gets permanently mounted.
Step 5: Add the Electronics
I put the camera far enough back that you could see the tip of the car in the shot. (I hoped it would add a perspective of speed.
I used superglue to mount the camera to the base (a strong twist on the mounting bracket would remove it)
The wires are tucked under the camera and the battery will sit behind the camera.
Step 6: Optional: Run Around the House With the Racecar Cam
If you are reading about a pinewood derby car, you probably have kids. This was silly fun! Interview the kids with the racecar cam. Chase the dog with the camera. Use it like an airplane and fly around after the kids.
Step 7: Add the Wheels
The most significant thing that affects the speed of your car is your wheels. There are numerous resources online that discuss spinning the wheels on a lathe, lubricating the wheels with graphite, reducing the contact area of the wheel and getting them on perfectly straight (to incredible tolerances).
I ignored them and simply pressed the wheels on
Step 8: Watch the Car Run
I used connected the receiver to the video input of my portable DVD player.
Be careful when you reveal this car, it can be quite a distraction. (One of the nice things about running in an exhibition race is you can keep the car hidden until the end.)
I saved a couple of runs to my video camera, which is unfortunately down for maintenance at the moment. I will try to post them to this Instructable latter.