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Old 02-07-2009, 03:35 AM   #35 (permalink)
Bicycle Bob
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[QUOTE=noeryan;86775]
Putting a cone in the front of the vehicle minimizes the stagnant air region (Total Pressure area). This is why you see rockets, birds, even tuna with pointed front ends.

Rockets use pointy tops because they get into compressibility approaching Mach 1. Birds and fish are able to keep their sharp foraging implements aligned with the flow. Streamlined cars have a blunt front end, to establish the boundary layer and accommodate crosswinds. Early NACA wing sections with smaller leading edge radii were slipprier, but easier to stall.
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