i just took a look and im guessing you may be running into a few issues. one issue is that when the initial speed is set to zero it then uses velocity. to fix this just set the velocity to x1 y0 z0, alternatively you could add in a clamp or minimum value for initial speed. another issue you may run into is that the speed of your projectile may be capped by the max speed option. to fix this you can just set the max speed to the same value as initial speed in the construction script.