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Wind resistance and automobile shapes Featured science projectScience project video

Conclusion

The hypothesis that a low profile, streamlined aerofoil shape experiences the least wind resistance is proven to be true.

The study of fluid dynamics, aerodynamic shapes and wind resistance helps us to design and develop more fuel efficient and faster vehicles. However, a trade-off is necessary between ease of application on the one hand and fuel efficiency on the other . A low profile aerodynamically shaped vehicle may have limited passenger space. However it is ideal for race cars and fighter planes.
 

Also consider

The experiment may be repeated using different shapes other than the ones already used.
The science fair project can be repeated using different wind speeds.  Also, do you get the same results for water resistance?
 

References

Fuel economy in automobiles - http://en.wikipedia.org/wiki/Fuel_economy_in_automobiles

Fuel efficient driving - http://www.eartheasy.com/live_fuel_efficient_driving.htm

Drag (physics) - http://en.wikipedia.org/wiki/Drag_ (physics)
 

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Complexity level:
6
Project cost ($):
40
Time required:
1 day to preparation, 1 day for observation
Material availability:
Easily found. An industrial strength fan may be purchased at Lowes/Home Depot or other hardware stores
Safety concerns:

Basic safety requirements