A review of the development and applications of the model assisted measurement of filling yarn velocity on a projectile loom describes the characterization of filling yarn motion, the dependence of filling yarn velocity on a range of factors (mathematical modeling of projectile velocity and dependence of projectile flight duration on restraining force), and experiments with filling yarn velocity (effects of static filling yarn tension on velocity and effects of yarn elongation). Experiments used the Sulzer PT 7100 projectile loom with different static weft insertion forces and velocities. The filling yarns were nylon, polyester, wool, polyacrylonitrile, cotton, and viscose yarns. Setting the filling yarn tension established the filling yarn dependency on restraining force and modulus of elasticity. Optimization of static tension increased productivity by up to 2 percent. 11 refs.