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WIN 8 July 2026
Tap test: the culprit is the mount.
An A/B hammer test finally locates the resonator: the compliance of the battery mount. We know what to stiffen.
method A/B tap test resonator battery mount compliance frequency ~15.8 Hz in flight flight #86
To hunt a resonance, you tap the structure and measure how it vibrates. A/B test: we finally isolate the resonator — it’s not the frame, it’s the compliance (the softness) of the battery mount, around ~15.8 Hz in flight. We know what to stiffen.
On the counter, flight number 86 — around thirty actually logged flights, roughly 1 h 16 of cumulative logs since the first take-off.
The next step is clear: a rigid battery mount that moves this mode out of the band that hurts. Then, finally, a truly clean hover.