Quote Originally Posted by pat mccarthy View Post
i do not know if i would go along with the HD of the air
I learned radials on the old R1820 P&W's used on Navy trainers. We have a few of the "Commemorative Air Force" planes stationed nearby, and that distinctive low RPM "thump" of a strong radial engine in a power cruise setting is easy for my ears to pick out as they cruise by, kind of like hearing an old Harley cruising by compared to a pack of the crotch rocket cafe racers running down the road with their high pitched whine. Put four of the big radials together, all well tuned and synched up and it's a symphony in the air - nothing like that sound for anyone who ever worked on or around them.