On Wed, 3 Jul 2002, Ian Woollard wrote:
> >that Cd is based on the plate area, as is usual for wings, not on its
> >cross-section perpendicular to the flow, as is usual for body drag
> >coefficients! ...
>
> Neat, missed that [a mistake on my "first day" as a hypersonic
> aerodynamicist, how will I live
> it down ;-) ]
I'm sure you'll manage. :-) Been burned on that one myself -- you should
always check *what area* something like a lift or drag coefficient is
being referenced to, because people do use different reference areas for
different purposes. (Anderson2 has the decency to use Cd for conventional
drag coefficients and cd for wing drag coefficients, which helps if you're
suspicious enough to wonder why suddenly he's using lowercase letters.)
Henry Spencer
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