Well Mitch a collector ring will be cleaner and sound deeper. That plane will be outrageously cool! Lars, here is a photo of the 160. I call it the 10 10 10 engine! (+- 10%). 10 cu in., 10 or so Hp, 10 out of 10 in running qualities, 11 pounds with ring and 11 inches in diameter and insanely low vibration.