# CO2 Dragster Design- Aerodynamics by langkunxg

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CO2 Dragster Design

Mr. Berner
Mr. Rieger
2008
Research and Development
Objective
of a few sciences related to the motion of your
dragster.
• Aerodynamics- the study of how solid objects displace fluid
air and other gases;
• Physics- the study of matter in motion;
• Tribology- the study of friction;
Research and Development
Objective

Development of CO2 auto design requires-
• Understanding the problem or purpose- trying to achieve the
fastest speed and/or best appearance;
• Knowing your limitations- being aware of safety regulations,
materials allowed, specifications, tolerances and
functionality;
• Making intelligent decisions- taking what you learn and using
• Testing your solution- comparing results with your
classmates to see what works better;
Research- Aerodynamics

 Air-
– Is a type of fluid such as water that can be
directed or displaced;
– Has mass and is measured in terms of pressure;
– Applies direct and frictional forces to objects in
motion;
Research- Aerodynamics
 You should be aware of four aerodynamic
principles-
–   Drag
–   Lift/Down Force
–   Drag Coefficient
–   Frontal Area
Research- Aerodynamics
 Drag is a combination of two forces that will
work against the acceleration of your CO2
car.
– Frontal Pressure occurs when tiny molecules of air hit the
front of your car and is forced away to make room for
other molecules to hit it.
– Rear Suction occurs when an empty pocket of air is
created in the back of your car resulting in a vacuum
cleaner effect that tries to pull your car backward.
Air Flow
Rear Suction
More on Suction
Research- Aerodynamics
 Lift is similar to rear suction in that a thin
empty pocket occurs as air passes over a flat
surface causing the car to lift.
 Down Force is due to high pressure in curved
surfaces that causes the car to be pushed
down. (Up next, notice how the windshield
takes the shape of a spoiler.)
Air Flow
Lift
Down Force
Research- Aerodynamics
 Drag Coefficient is a way of expressing how
slippery a car is.
 Here is a tip to increase your speed and lower