- Joined
- Jul 2, 2007
- Messages
- 5,294
Have you ever been going about your business doing whatever and heard it? The resonating thrum-thrum-thrum of radial engines(s) up at cruise altitude over flying your location? Very rare delight in our modern times. Not talking about a local radial flying around, but one up around, I don't know 15,000+ or better in cruise flight. So very rare. At least where I live.