Hi Merlin,Merlin wrote:If you shoot a video, you will see a marker on the inclined section going down nearly vertically (the red arrow).
I tried to shoot the video but I was standing too far from the camera and could not make out the marks on the line.
In the same session I also shot another series of casts to show fly leg momentum, these much closer to the camera. Some of these were "sexy loop" shapes before they crashed into the net/board, so I think we can see that your conclusion of the mark moving down and very slightly forward is supported. Forward velocity in the inclined section of the sexy loop is very close to 0m/s relative to the ground.