Use Science to Build the Fastest Pinewood Derby Car
For seven years, I worked at NASA on the Mars Curiosity rover. It is just like a Pinewood Derby car, except it has six wheels, it’s nuclear powered and it shoots lasers.
My Cub Scout son and I decided we would take the science principles I used while building stuff at NASA and apply them to making his Pinewood Derby car.
Take a look at some of those science principles in this video and check out my list of the most important steps for making fastest Pinewood Derby car possible.
SEVEN STEPS FOR MAKING THE FASTEST PINEWOOD DERBY CAR
1. Max out your Pinewood Derby car’s weight at 5 ounces
Get as close as possible to the car’s maximum weight (usually 5 ounces) and make sure the heaviest part is about 1 inch in front of the rear axle. This is the most important step. Science shows if you do this correctly, you will beat a Pinewood Derby car built exactly the same — except with the weight toward its front — by 4.6 car lengths. It works because the farther back the weight is, the more potential energy you have because your center of mass is higher up on the track. (Don’t put it too far back, or your Pinewood Derby car will become unstable and pop a wheelie.)
2. Use lightweight wheels.
Using non-standard wheels is illegal in some packs’ races, but if it’s not in yours, this is a must-do step that will give you a 2.1-car-length advantage at the finish line versus a car with normal wheels. It works because heavy wheels take away from the kinetic energy (the energy something has due to its motion), which makes the Pinewood Derby car slower.
3. Use bent polished axles.
Bending your Pinewood Derby car axles with a bending tool will make the wheels ride up against the nailhead, which creates less friction than if the wheel is bouncing around and rubbing against the wooden Pinewood Derby car body. See video above for details.
Railriding means you steer your Pinewood Derby car into the center guide track just enough that you keep the car from bouncing around. This helps reduce friction and saves energy for speed. See video for details.
5. Create a Pinewood Derby car that is reasonably aerodynamic
An aerodynamic Pinewood Derby car’s design cuts down on drag caused by air. No need to get crazy here, but simply having a wedge-shaped Pinewood Derby car instead of the standard block out of the box will equal a 1.4-car advantage at the finish line.
6. Ride on three wheels by raising one wheel off the track.
You will move faster if you have to get only three wheels rotating, giving you a 1.1-car advantage over an identical Pinewood Derby car riding on four wheels. (Check your pack’s Pinewood Derby rules to make sure this is allowed in your race.)
7. Use lots of graphite.
Graphite is the best way to lubricate your wheels and axles. There isn’t a big difference in types of graphite, so buy the cheap stuff and use as much as possible. Be sure to get plenty around each wheel and on the axle.
THE WINNING CONCLUSION!
It works! After my research, my son and I wanted to do one final test to prove that this is a good list. So we built a simple Pinewood Derby car using this list in 45 minutes, and we beat the fastest Pinewood Derby car in our local race by two car lengths. Turns out, science works!
Mark Rober worked as a mechanical engineer at NASA for nine years. During this time, he worked on Curiosity, a car-sized robot that left Earth in 2011 and landed on Mars in 2012. Mark is well-known for his YouTube videos on science, engineering and gadgets.
I will probably use this in my pine wood car
LOVE MARCK ROBER!
I like how they used Mark Rober’s science
Mark Rober videos are the best.
Fun way to learn science.
Waooo this is really something
All of these points are correct. If you can test right vs left rail riding do so. My son set a new track record, but came in second overall by .0006 second.
Make sure you check your councils rules. Our council would disqualify for a few of these
If riding on only three wheels, why not eliminate the fourth wheel altogether ?
Should the car also be as low as possible to minimize the air flowing under it ?
Thanks – Peter D.
That fourth wheel still must be in place to guide the car. It might not touch the floor of the track but it still is needed to follow the center guide rail.
love it, thanks!
Or amazon it
who is subbed to this wizard?
disqualified using polished axles….. said it right on the BOA pinewood derby sheet!
Other than putting the weights in the back, does it matter if they sit on top of the car or should they be under the car? Does changing the center of mass affect the performance? I’m considering flipping the car upside down so the axles are on top, and then inserting the weights underneath (or recessing them). The idea is that the car will ride lower overall and will help to reduce drag.
thank you <3
I love this the science is quick and easy and ours was a drag race car and my son loved it
This is usful
So Do we want 3 of the wheels bent or just the back 2?
used these tips at a work pinewood derby race and came in 2nd out of about 60 cars. Seems to work well.
This video was really good my son won second place
ThIs Is ReAlLy GrEaT ThAnK YoU
That is an awesome video thank you for all of the good pointers.
Just entered a car in our work pine derby tournament that had 50 entries. I used the advice in this article to build my car and we won first place beating out all of the other 50 cars!
Our first year in Cub Scouts (my grandson was a Tiger) and he designed and did a little of the work in each section (sanding, painting, etc) and his car won 3 trophies. It didn’t follow any of the suggestions in the video, other than the graphite. Others at the meet were experienced PWD parents, and we still beat them….there is some luck involved. I do like the science of the video.
I like the article. I enjoyed reading the science.
Some rules vary from pack to pack, maybe that’s why it says you can’t