There are 3 tracks on this rolling ball sculpture. 1 track for the loop d' loop, 1 track for the single marble and 1 track for the "marble train" which has 5 marbles in the train. The final dimensions are 46" wide X 30" tall and 18" deep. All stainless steel, of course. 1 3/8" marbles.
The loop d' loop has 7 consecutive loops. Want to see it in action? See it here on youtube: http://www.youtube.com/watch?v=rBg234PEkVI - Don't forget to rate the video!
I am very happy with the outcome of this sculpture. It is quiet and smooth with very little loud banging noises. Nice and compact. It takes a full minute and 5 seconds for the single marble to complete it's trek from the top to the bottom. The motor is a 5 rpm DC motor which powers the helical lift.