Quote:
Originally Posted by aerohead
The analog clock face represents a 3D ... occurs 115degrees downstream,at 4seconds after....

The 115° point is 25° after the 90° top (or bottom). That's just past 4 seconds (4.17 actually). So the 4 second circle I made in my graph is close to that. Hmmmm.
I did a little more playing, the curve of the template follows almost exactly a 6 second circle until about halfway down the template. Given that a truncated boattail is nearly as effective as a full one, that critical part of the template is very closely approximated by a circle. It might be arguable that any boattail, no matter the length, should start with a circular form? I need to play with my graph and see how circular the Dryden tail is...