> Nice formula!

You have to be careful with this (typical) formula that you measure
the relevant "area" the same way that the people who determined the
the drag coefficient did.  The rocketry folk usually doom themselves
into having to specify drag coefficients of close to 1 to get the
predictions of simulations to match measured reality, and that's
with pointy, streamlined, rocket-shaped things.  They shake their
heads at the drag coefficients quote for cars (0.4!), concluding
that the car people must be measuring things differently than they
are.  Perhaps the area used is the total surface area of the car,
rather than just the frontal area.  I don't know that the question
has ever been settled for sure.

BillW
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