It's my demo! :)
I believe the problem is that in C3 the event "On drop" is triggered on the next tick after the touch has ended. As a result, both Touch.AngleAt and Touch.SpeedAt are zero.
The solution is to replace "On drop" with "On touch end"+"Panel is dragging".
Edit: oddly, my capx works fine with "On drop" even after converting to C3P. It feels like a bug.
Edit2: Bug, reported.