Changed all 'NED' references to 'FRD'. Also cleaned up mixing of m/s/s and m/s^2 to use the latter. Corrected m/s/s to Pascals. Plus minor typos. Also made some minor cosmetic clean ups.
Co-authored-by: Robin <robin@Robins-MacBook-Pro-Work.local>
Co-authored-by: Mathieu Bresciani <brescianimathieu@gmail.com>