We’re heading down the fast lane and talking about CO2 dragsters. Dragsters are a favorite here at Pitsco, not only because they were one of our early products, but also because they are engaging and exciting for students of all ages! Zoom into the science of speed and see what it takes to get to the finish line!
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More You Know, Faster You’ll Go
If you’ve ever raced a CO2 dragster, you know that it’s a heart-racing, adrenaline-pumping experience – the minute you push “go,” your dragster is off! Yes, your dragster might be small, but when you race it, it’s (hopefully) going to move at incredible speeds. Knowing the factors that can affect your vehicle’s motion and velocity is critical to ensuring it reaches its top speed.
Let’s look through the eyes of Sir Isaac Newton to understand how a dragster really works.
According to Newton’s first law, an object will remain without any motion until an outside force acts upon it. When racing a CO2 dragster, the dragster begins at rest. But, when the starting mechanism is activated and the CO2 cartridge is punctured, many types of outside forces will begin working on the dragster.
When the cartridge is punctured, the pressurized CO2 gas is pushed out. Newton’s third law of motion states when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The action of the CO2 gas leaving causes an equal and opposite reaction – the gas is moving backward and the dragster is moving forward.
Newton’s second law says the acceleration of an object is inversely proportional to its mass when the force is constant. So, in terms of CO2 dragsters, the less the mass of the vehicle, the faster it goes. Mass is the greatest determining factor for your success on the track. Creating your dragster to have as little mass as possible will be important. However, you want to make sure your weight is distributed evenly throughout the vehicle or you might be doing a wheelie all the way to the finish line.
There are also other forces that act upon the dragster during that second jolt. Although, these forces are ones that work in the opposite direction to slow down your dragster. These main forces are friction and aerodynamic drag.
The dragster has many parts to create friction — where the wheels contact the tract, the axles contact the dragster body, and the wheel hubs contact the dragster. To reduce the amount of friction, make sure your wheels and tires aren’t rubbing against the car body and the axles are free to rotate.
Aerodynamic drag comes into play when your vehicle is zooming down the lane. As speed increases, the dragster is met with air resistance. Air resistance pushes against your dragster and prevents it from going as fast. The shape of the dragster body, the position of the wheels, and the finish on the dragster all help to determine the amount of aerodynamic drag. It’s hard to see aerodynamics with the naked eye, but with a wind tunnel such as Pitsco’s X-Stream Wind Tunnel, you can see how much drag your CO2 dragster will face and make adjustments accordingly.
A few of Pitsco’s cool staffers contributed their knowledge and time to this post. We’re proud to have a great group of developers, writers, managers, builders, and creatives who can help bring the Pitsco Blog to life.