This is a great little video series demonstrating the difference in drag among some well-known items. I think most of us know the basics, but it is a wonderful demonstration.
http://www.youtube.com/watch?v=Lp3OHzNt7Iw
http://www.youtube.com/watch?v=zOJ6gWDMTfE
http://www.youtube.com/watch?v=ZOIQC8jds1o
http://www.youtube.com/watch?v=ftq8jTQ8ANE&list=PLDBC439409A651870
David
http://www.youtube.com/watch?v=Lp3OHzNt7Iw
http://www.youtube.com/watch?v=zOJ6gWDMTfE
http://www.youtube.com/watch?v=ZOIQC8jds1o
http://www.youtube.com/watch?v=ftq8jTQ8ANE&list=PLDBC439409A651870
David
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