Earlier in my flying career I was lucky enough to fly an aircraft with 4 big radial engines. The sound they made and the general sense of satisfaction you got from operating machinery that demanded knowledge, skill and a bit of art, is simply not duplicated in modern airplanes. I still consider my time on the mighty Douglass as the high point of my flying, but the reality is the roar of the a high powered piston engine is fast disappearing and so my tiny contribution to remembering them is my handle.