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=IhiqUD7-NUs - 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.