Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds. Air is also considered a fluid in this case. For some classes of racing vehicles, it may also be important to produce downforce to improve traction and thus cornering abilities. 

The rail car is a CO2 propelled car designed in a Program called Solidworks. Shown below are images of the car made by me, following tutorials given to us to follow to construct it. 

The thin wheels are meant to be for the front, but may also be utilized in the rear for a more slim look. The Thick wheels are meant exclusively for the rear,  The rear tires have lettering on them, the lettering being my last name.  The top lettering is in English but the bottom lettering is in Greek, Why the bottom is in Greek may be due to the font style, however the top also appears to be in the same font style. I chose to leave it because it was a cool little phenomenon that happened during the decoration of the wheel. 

The top axle if the front axle, and the bottom axle is the rear axle. The difference between the two axles, is the front axle is longer than the rear axle by about 10-15 millimeters. Then there is the CO2 Cartage, it is about 50 millimeters in diameter. 

The Body of the car was interesting to make, the front section where the axle hole is extrudes from the main body of the car, and the rear fender cuts into the body to give the rear tires space to sit without exposing the washer and where the axle connects to the wheel.   The washer was meant to help reduce the wheels from bumping into the body of the car creating friction slowing it down. 

The bullet car is my design for the CO2 car race, it has the shape of a bullet to attempt to achieve peak aerodynamics. 

The pictures above are of the bullet car while I was making its body. It started as a tube, and progressed into what it is today.