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The Device A torus ratchet, simulated from first principles — winding, magnet, and ferrofluid.

An N52 slug immersed in EFH1 ferrofluid, sealed in a toroidal raceway, driven into one-way orbital circulation by an audio current in a conformal {12/5} winding wired differentially (L − R) across a stereo amp. This site is the public face of a physics engine built to answer, honestly, what the machine actually does — including what a single tone can do.

WINDING

{12/5} star

12 nodes · skip-5 · 12 poloidal + 5 bore turns per wrap

DRIVE

314 / 3140 Hz

L − R differential · π-anchored 10:1 · volume = throttle

PAYLOAD

N52 slug

axial, tangent to the track · orbits in EFH1 ferrofluid

ARRAY

1 → 6 tori

bores inward · 2 = facing pair · 6 = cube faces

First results — what can one tone do?

The engine is built from the real {12/5} winding (Biot–Savart, validated), the ferrofluid's magnetization, and the slug's driven dynamics. Two things fell out: the bulk-fluid-flow channel is rigorously unable to drive the orbit (its net azimuthal thrust is identically zero for a single winding), and the real driver is the direct force on the slug rectified by the winding's ~50% coverage asymmetry.

Single-tone drift vs frequency — **A single tone is not dead — but frequency is everything.** Net drift is strongest at **low frequency (~60–70 Hz)** and decays to nothing above ~1 kHz. At 314 Hz it's weak. If the one tone you tried did nothing, this says: try low.

Dual-tone beat map — **Dual tone favours small beats.** With a fixed base tone, the strongest rectification is at a **small beat (~50 Hz)**, fading as the two tones separate.

Honest boundary: these are relative rectification-propensity maps from a 1-DOF reduced model, not calibrated lap rates. The specific 314/3140 pair stays weak here, which means its robust bench motion relies on the ferrofluid's full nonlinear response — the 2D/3D ferrohydrodynamic solve, which is the next build. The bench remains the authority.

Physics engine — solver validated; full ferrohydro solve next

Provenance & full physics: docs/SPEC.md · built with Claude Code