I’ve noticed looking at shaft descriptions that some have a low trajectory, some a mid trajectory, and some a high trajectory.  I assume that this is a function of where the flex point is.  Can you tell me where the flex point is on a low trajectory shaft, on a mid trajectory shaft, and on a high trajectory shaft?

Answered question

I believe it has more to do with the frequency of the shaft tip. You would need a frequency analyzer to determine this, or know the tip frequency. Golfworks/Maltby uses the procedure towards the end of the manual (see link):
Wishon uses a different method measuring at 5″ intervals from the tip beginning at 11″. Again using a frequency analyzer.
The higher the frequency, the stiffer the tip, lower launch is how I understand it.