ex Aaron Smith - ARocket list MAY be useful for rocket body design. I found this while researching a non-rocketry related project. http://beadec1.ea.bs.dlr.de/Airfoils/calcfoil.htm If you can figure out the coordinate system that they use it could be very useful, as it gives you the drag coefficient of a given shape. Granted, it was designed for airfoils but methinks the same basic calculations go for other shapes as well (rockets). When it asks for the Reynolds number I give it the answer from this page: http://www.ehsfreeware.com/aircalc.htm I wonder if the CD predictions on a rocket-ish shape would be accurate? Aaron -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics