The sound of those engines at idle. Like the coolest jazz beat you’ve ever heard.
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Indeed, there is a great harmonic resonance with multi-engine prop aircraft, especially radial engine aircraft. I still remember hearing that fantastic thrumming sound when, as a kid, a B-36 would pass overhead. It sounded like God’s own beehive.
I can hear a radial engine somewhere in the sky and instantly recognize it...distinctive sound!
Love it!
When I was in the USN, I loved watching the C-1 Cods take off and land...I had to learn about them in mech school, but they were the last ones...:(
https://www.youtube.com/watch?v=70CjsIbLwU0
That was a 16-minute collection of startups, takeoffs and flybys of a dozen or so radial-engine warbirds, including Bearcaat, Hellcat, Corsair, Corsair 2, A-20, B-24, & B-17 -- and ending with a "missing man" formation flyby of four AT-6 Texans.
Brought back lots of fond memories. I grew up right across the road from Ellington AAC Airbase during WWII -- and then moved just east of the approach to the N-S runway after it became Ellington AFB.
I spent many happy hours on the lawn, watching dogflights -- and wore out a couple pairs of cheap field glasses (and innumerable screen doors) running out whenever a new-sounding A/C flew over...
Like all on this thread, I still love and recognize the sound of a radial -- or a big Vee...
TXnMA