Head diameter mm — ESTIMATE | | Target pitch MIDI note — ESTIMATE | | Mylar head thickness mil — ESTIMATE | | Steel shell wall mm — ESTIMATE | |
| Modular Pedestal Drum Stack — EMPIRICAL ESTIMATES | First-order ideal-membrane model. Planning values only, not fabrication authority. | | | | | | | Head areal density σ (kg/m²) | | Required head tension (N/m) | | Predicted f01 fundamental (Hz) | | Predicted f11 overtone (Hz) | | Predicted f21 overtone (Hz) | | f11/f01 ratio (ideal 1.594) | | | | Shell decoupled (ring > 4×target) | |
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