This describes something fluttering in the airflow of your Prop. No change with RPM No change with speed. Just an observation. doesn’t hurt to look. Thin fiberglass can also “oil can” /vibrate. check for wheel pants loose/shaking if applicable. > On Apr 19, 2019, at 3:39 AM, Stef den Boer via KRnet <krnet@list.krnet.org> > wrote: > > Only strainge rumbling sound from the nose. Dont think it is nose wheel > shimmy because it sounds with 10 kts the same. And it does not respons to > engine rpm.
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