Rumbling sound
Bonanza Professional
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Currently flying the turbocharged version. In the cruise, there is a persistent low-frequency rumbling sound. It is most noticeable with headphone noise cancellation active, but it is still there when I turn noise cancellation off.
I'm assuming it is intentional, but where is it coming from? The airframe itself?
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I think I would need a video to know exactly what you're asking about. Unless it's something really unusual, then I suspect it's just part of the wind or engine noise.
EDIT: Or it could be the tip-tank transfer pumps, if you had those running.
