A Feathered-Louvre Aeroelastic Stabiliser for Long-Span Cable-Suspended Vertical Bifacial Photovoltaic Arrays over Agricultural Land

Defensive publication (preprint, v1.1). Cable-suspended photovoltaic mounting is materially far lighter than pile-driven racking and can span terrain that accepts no pile, but pre-tensioned long spans are limited by wind-induced aeroelastic instability — galloping and torsional divergence — not by steel price. Existing vertical-bifacial wind-shedding concepts shed load by rotating a whole module about a mast; existing cable-supported arrays carry rigid modules and inherit the instability. This work discloses a specific, previously undisclosed combination: dividing the suspended fabric into narrow, passively self-feathering vertical louvres within a fixed frame suspended from a tensioned cable net, so the span sheds its own aerodynamic driving force fail-passively. The claimed novelty is narrow — the use of passively feathering louvre segments as a means of aeroelastic stabilisation of the span — and is stated as a testable hypothesis (force-slope limiting, modal frequency separation, flexure hysteresis damping), not a verified design. A first-order static comparison shows the cable system to be dead-load dominated (steel demand nearly insensitive to feathering success), which locates the value of feathering squarely in the dynamic domain. Failure modes, a residual-solidity sensitivity study, two schematic figures and a reproducible calculation script are included. Wind-tunnel/time-domain verification, fatigue testing, a full LCOE model, a freedom-to-operate study and regulatory land-use classification remain open. Released so the disclosed combination stands as prior art, freely usable by all and exclusively appropriable by none.