In case you are wondering, “What is the pinewood derby?” It is a major Boy Scouts of America Cub Scout annual event. The boys get to build pinewood derby cars for a race day competition that happens every March. It is a fun way for parents and kids to get to bond together as they work on creating the fastest pinewood derby car. My son was in Cub Scouts for five years and we loved all the planned fun activities for boys. You can get super creative with your pinewood derby car designs. My son’s friend made a cheesecake slice pinewood derby car. However, most people try to make fast pinewood derby cars so they can win the race!
Today, I will be sharing Pinewood Derby speed tips from Troy Thorne, author of Building the Fastest Pinewood Derby Car (affiliate link below). I hope you and your child enjoy working together on this STEM-related project!
Troy Thorne is a woodworker, artist and derby-winning dad! In his book, he shares his expert tips, techniques, and amazing design template patterns for awesome pinewood derby cars. It is a great book for parents and scouts of any skill. It will teach you how to build a jaw-dropping, prize-winning car that’s the fast out of the gate.
7 Tips On Pinewood Derby Car Designs For Speed From Troy Thorne
You don’t start creating a Pinewood Derby car by jumping right in and starting to cut away wood. You must first understand the principles of speed before you can apply them. I’ve been asked many times what the secret is to building a fast car. I always reply the same way—there is no magic “one” thing you can do to make your own car faster. It is a combination of a lot of different things that all add up to a very fast car pinewood derby car. Here are a Pinewood Derby speed tips to pay attention to if you want your car to cross the finish line first!
Friction Reduction
More friction equals less speed. You might have built a car that has lots of potential energy, but not all of that energy converts into speed. Some energy changes into heat when surfaces, like the wheel and the axle, or the wheel and the track, rub against each other. This is friction. If you can cut down on this waste of the Pinewood Derby car’s potential energy, you will increase your speed. Less friction is important for building a fast pinewood derby car.
Wheel Alignment
If you maximize all the potential energy, polish the wheels and axles to reduce all the friction, and then just stick the wheels on your car, you will be very surprised how poorly your car will perform. If your Pinewood Derby car travels down the track and bounces off the guide rail a few times, it will be losing speed every time it touches the rail. Or, your alignment may be so far off that your car will get the “death wobble,” where the back of the car wobbles back and forth.
A finely aligned car will look like it’s accelerating down the flat part of the track. What’s really happening is an aligned car isn’t losing as much speed as the unaligned cars. The important thing is to ensure good alignment of the axle slots in order to have the fastest car at the Pinewood Derby Race. You can test the alignment by performing a test race and seeing if the car travels a straight line or veers as it goes.
Weighting
Of all the Pinewood Derby speed tips, properly adding weights to your car is one of the easiest things you can do to make your car speedy. There are many types of metal you can use to add weight to your car. I have seen all types of things used, including coins, washers, and even nuts and bolts. I get asked all the time about what is the best type of weight to use. A lot depends on the type of car you’re building. Very thin cars are easier to build with tungsten weights. Tungsten is very dense, so you can fit a lot more weight in a small space than you can with lead. Tungsten is available in many useful shapes, making weighting your car even easier. The majority of the weight should be placed at the rear of the car for the fastest pinewood derby car designs.
Axle Prep
Remove the burrs! All official BSA axles, when they first come out of the box, have a set of small burrs located underneath the head of the axle. Whenever the plastic wheels and the axle head touch, these little burrs create a large amount of friction. The burrs are almost like mini brakes, so they must be removed. This is an important step. The underside of the axle head must be polished smooth as well. Remember that friction is the enemy of speed, and these little burrs are a major source of friction for Pinewood Derby cars.
Taper the Axle Head
As the axle head and the wheel rub against each other, they create friction, which slows your car down. Another important one of these Pinewood Derby speed tips, is that you can minimize this friction by tapering the head of the axle with an electric drill and a small triangular file. This makes the area of the axle head that touches the wheel much smaller.
Polish the Axles
A great deal of friction is created when the wheel rubs against the axle while it is turning. To reduce this friction, make the surface of the axle as smooth as it can be. Believe it or not, the outcome of a race may well depend upon who does the best job polishing their Pinewood Derby car axles.
Use a Calliper
With a calliper you can measure parts of your pinewood car down to the thousands of an inch. It’s very useful to measure the diameter of your axles to help you select the roundest axles. You can use it throughout the polishing process to make sure you’re not removing too much material from the axles. It can also be used the check the outside diameter of the wheels to identify any wheels that are out of round.
For more Pinewood Derby speed tips and secrets check out Building the Fastest Pinewood Derby Car: Speed Secrets for Crossing the Finish Line First! If you are serious out building the fastest Pinewood Derby cars, you will definitely want access to all his tried and true tips and Pinewood Derby car designs.
Choosing Best Pinewood Derby Car Designs
When it comes to Pinewood Derby car designs, I suggest you review Troy Thorne’s speed tips. Be sure to work with your son so he can learn these principles. Then you can talk about car designs that won’t conflict with the speed tips. You can find free downloadable templates for for a fast car but I suggest you let your son show his creativity. If his design needs modifications, you can discuss why and make that part of the learning process. Each year that your son competes, you can perfect the derby car designs until you have a winner of your own creation. That is sure to be a rewarding goal to work towards.
It really is fun to go from the standard block of wood to a race car designed by your son! From drawing out the car body shape to building your car by attaching wheels and weights, it is an experience to remember. The last step is the first coat of paint. There is so much work that goes into the car design plan first! Young Scouts will always treasure creating their own Derby car.
If you want to learn more about the Pinewood Derby Rules, you can get the official information at the Boys Life website here.
Have you and your son ever participated in the Pinewood Derby? Do you have any tips you would add to this list for how to build fast Pinewood Derby cars? Share a picture of your Pinewood Derby fast car on social @familyfocusblog. We’d love to see it!
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