I've had a quick search of the threads to see if these have been posted but didn't see them, I will stand correction if they a re-posts but they are awsome and you just can't beat the round sound. It is truly written that if aero engines were meant to be any configuration other that round - Pratt and Whitney would have made them that way !
Turn up the volume !
Mind you the engines are only about $6,000 each.
I'll take 4 and make a B17
I love deadlines. I like the whooshing sound they make as they fly by.