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When you race a C02 car it's very important that the car is low weight and they are frequently used to demonstrate mechanical principles such as mass, force, acceleration, and aerodynamics.

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When you race a C02 car it's very important that the car is low weight and they are frequently used to demonstrate mechanical principles such as mass, force, acceleration, and aerodynamics.

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You should test somewhere flat where nothing can get in the way of the CO2 car. Then after fix your imperfections. 

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You should test somewhere flat where nothing can get in the way of the CO2 car. Then after fix your imperfections. 

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The car's weight and shape are very important because if the car is too heavy it won't move and if the shape is wrong the car will go slower than one that is light and has a good shape. The shape must be not too heavy or too light.  

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The car's weight and shape are very important because if the car is too heavy it won't move and if the shape is wrong the car will go slower than one that is light and has a good shape. The shape must be not too heavy or too light.  

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Aerodynamics is the effect of airflow and the forces involved when an object moves through the air or when air moves past an object.  This is important because it helps the CO2 car go faster. 

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Aerodynamics is the effect of airflow and the forces involved when an object moves through the air or when air moves past an object.  This is important because it helps the CO2 car go faster. 

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Co2 tracks are around 60 feet so first you need to find an area with that amount of length also their should be sides on the track so the car does not fall out of the race, the co2 cars should be started at the same time so no car has an advantage.

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you should find a long straight area to test your Co2 car and a ramp so you can have the same amount of energy each time and see what works and what does not

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Creating a wooden racetrack with walls might be helpful in guiding the cars to a "finish line". A finish line could be a slow-motion camera, like your iPhone, should work. You could also have a real finish line that you could break to be more actuate with your measurements. You should have ample room at the end to ensure they don't crash into anything.

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When you race your car, you might want to make sure there is no uneven terrain or obstacles that could effect your performance. You'll also want to position your car in a way that helps it go as straight as possible. If it usually goes a little to the right, maybe position it a little to the left so that it wont go way off in the wrong direction.

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Make sure your car goes straight. If it isn't going straight, there might be friction involved (in the wheels) or the wheels are not aligned correctly. If it explodes, you might want to rework your design. Wind tunnels may not be available to you, but if they are you can see how air flows over your car, causing air resistance.

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you to make your build have everything you want to have on your CO2 car before the race

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You want to test it on a smooth surface and look at stuff you can fix and improve on your build

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fine tune and make sure all of the parts are on properly

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When you are going to race, first make sure that everything is how you want it on your CO2 car so it will be the fastest, most arrow dynamic and weighs the least.

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For the testing, we probably will not get a ton of compressed air, so you'd have to test it with different pushes (some really light, others more powerful), and find out how hard the air would have to push to do certain distances, and estimate how many adjustments you could do to make the lightest push go farther. Better safe than sorry!

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You put effort in your build and it's now time to put it on the final test. See if you'll surpass others.

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Co2 cars need to be aerodynamic so it does not have air resistance

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You need to poke a small hole in your opponent's CO2 and decrease the psi in their canister in order to win. Just kidding. Make sure that you have the exact same environment as the test so there is no difference between what id did before and what I did during the race.

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before racing you must make sure all parts of your car are working properly. any faults may lead to your car losing.

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Before racing your CO2 car, you have to make sure that everything is exactly the same as it was when you were testing it on the flat surface.

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Adding wheels will make the car not go against the ground but adding wheels will make the co2 car go easy through the air making so its not scratching off the ground

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the winner would obiously have a good desgin and have done lots of good test

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The winner of the race will have skinny wheels, the most less drag of the bunch, and Of course, the best design.

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you hope it works

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Before a race you want to make sure that everything is the same as when the test was completed.

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A flat, bottom with a pointed tip or a downward-angled nose. The closer to the ground it is, the better, because there is less air-intervention. If wheels are a possibility, they would help, but you would have to make sure they move VERY easily, because if just one wheel stops, it will drag, and slow down the car

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When you are building the CO2 car make sure everything is sturdy and in place so it will not fall apart when testing.

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you want to make it go fast and not go flying some where and make it stay on track

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Try finding a good surface to test on like a smooth surface. And if your car fails during the testing, try to improve it to make it better.

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you dont want to take to much material off you cant put more on

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when you test your car it should be tested on a flat surface. since the race will be on a flat surface it is good to test on it. it is good to break small parts of your car, this will help you improve the design.

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When you test your CO2 car observe your car's performance. And try to improve its efficiencies like Drag reduction, speed, and weight

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Have a control car (the plain block, see above) so you can see the differences in speed and weight between the basic car, and your car.

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you need to make test on you're car like does it go as good speed, is it a good weight, is there somthing tha can prevent it from going faster, is there anything that you can add. To test and make sure everything is working or if there is something you cann add, something fails you need to go back a redo / fix you're mistake.

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When testing make sure you know what your design should do. After make sure it did those things, if not, Fix it and try aging. If So, improve your design to be better.

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when testing you want to test on a relatively flat and smooth surface so something doesn't catch on the bottom of the car or wheel and through off the results

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you what to make shure that it is really skinny in the front becaust you dont what to hidroplan and make it fly you want the whait in the bake so it dosent do that

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When your testing your car, you want to roll the car forward on a flat and smooth surface to see if it veers off to the left or right. If it does the wheels are most likely not in-line, and need to be readjusted.

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When you test you should look at key details and how they affect the car.

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A aerodynamic shape which makes air to flow over the surface because of its symmetrical shape

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Adding wheels to the car to make it avoid having friction with the floor, and it would make the car go in a straight line instead of being everywhere.

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When Building your car you need to do everything correctly and do lost of messuring and testing to make sure everything will fit

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Make sure to have a turbulent boundary layer sticks to the surface of the vehicle. This helps it reducing the size of the drag pocket.

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When creating a CO2 car, you don't want a lot of friction. Make sure that you don't have your wheels rubbing against the car. It is also good to have equal mass all through out the car so it doesn't flip over.

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The biggest part of design is reducing drag (at least in this case), so how can you do that? Well, you don't just want to focus on the top of the car. The bottom should be close to the ground and flat. A good top design should be the "doorstop" or "wedge design. This let's the air flow over it kind of like a ramp.

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try to find whats wrong and fix it

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you want to create it narrow and have it the litest

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You want to create lift so that it has less weight. not to much lift or it might start flying.

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Make axles free. If they rotate easy it would have more speed.

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your car may need to have some improvements before testing. it is good to allow changes to your car, so don't start gluing everything together just yet.

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You'd want the bottom to be flat, because irregularities add friction, and that slows it down.

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You want at the front of the car to have a shape like a sphere where air glides off and their is no air resistance so your car can go as fast as it can possibly go

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you want to make sure the body of the car isn't getting the way of the axle and wheels rotation

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you want to make sure the body of the car isn't getting the way of the axle and wheels rotation

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When building the CO2 car, you want everything to have equal proportions so that the car stays in the middle of the track and doesn't go straight into the wall.

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Design a model of your car and make sure it is as little weight as possible so it doesnt slow the car down.

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You should watch out for the friction of the car the, Weight/mass, and the dag the your design has. Add a Boat-tail that will reduce the drag and have a slick and smooth surface too farther decrease the drag.

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you want the car to be as light as possible so there is no extra weight on the car that will be slowing it down.

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the car should be light but still strong. the front should be slanted to allow air flow. if you used a square car it would be hard to move faster because it would push against air instead of flowing with it.

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you want to make it symmetrical so it will be reliable and not flip over or spin

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this is what the aerodynamics of one design of a Co2 car look like for reference 

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When you make it try to make it aerodynamic and make sure the wheels don't have a lot of friction on them because with lots of friction it will slow down the car.

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You might want to make a car that has a base that avoids contact with the floor. Because if it made contact with the floor, the car would stop.
You should also make it a little smaller too so the CO2 canister could push the car faster.

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You want a sort of airfoil shape because it has a smaller drag coefficient and more lift.

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you want a car with aerodynamic's because it helps you glide through the air. 

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you want a car with aerodynamic's because it helps you glide through the air. 

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A teardrop shape is considered the fastest and most aerodynamic shape because of it's pointed nose.

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the shape and weight is important so its aerodynamic and has little drag

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the shape and weight is important so its aerodynamic and has little drag

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When designing a CO2 car, you want to try and make the car aerodynamic and flat so that the air that the car is going against doesn't bring the car to a stop really quickly.

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you want something with low drag and aerodynamic

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you want a spere because it allows airway to flow with littel air disruption

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Make a light weighted car so its not as heavy to make it go slower.

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Make a light weighted car so its not as heavy to make it go slower.