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Figure 12
A schematic drawing of a mechanical model of a single spiral arm composed of interlocked fixed-length chain segments (orange), located at a variable distance of ρm,μ from a central node (large black dot) by a translational actuator (double arrow) and equipped with rotational actuators (single arrows with coloured circle sectors attached) at their common pivots (small black dots), by which they can be oriented relative to one another in fixed angular increments of opposite sign ±φ (here, φ = 2π/6; in general, φ = 2π/m). A full mechanical model would consist of m single spiral arms acting in unison within an m-fold rotational symmetric arrangement around a common centre (large black dot).

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ISSN: 2053-2733
Volume 79| Part 6| November 2023| Pages 570-586
https://doi.org/10.1107/S2053273323008276
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