I’m curious about this noise. My T1 was making a knocking sound in fixed wing mode. I assumed it was mechanical so I didn’t mention it. Certainly throttle related, because when I pull the throttle back to glide it goes quiet.
If it helps: Bluejay ESCs. Using ESC telemetry for the notch filter. BDshot. Matek F405-VTOL. No noise in hover mode. This is a fresh (re)build so I’m not finished tuning it yet, but generally it flies well.
It didn’t make the sound when I flew it last fall, but that was on a different controller and a lot has happened since then.