As a starting point for a general discussion on aerodynamics, I thought I'd start a thread with a cool picture.

I've been doing a little research on fluid dynamics hoping to get some figures for Reynold numbers (Re) and drag coefficients (Cd) of classic pattern designs of different scales moving out at various speeds.

Here are my online starting points as I'm too lazy to go into the garage and dig out gas dynamics textbooks:

http://en.wikipedia.org/wiki/Aerodynamics

http://en.wikipedia.org/wiki/Reynolds_number

http://en.wikipedia.org/wiki/Drag_coefficient

I figured at least a few of us would chime in on this discussion starting with you, Cees!

Should be fun!

David.