Toroid Sim – two-blade prop visuals; fork of Toroid Vortex Lift with a live tensegrity frame (orange carbon struts, blue Dyneema strings, 12/6 carbon booms) and a whole-aircraft optimizer. the Toroid Air geometry spun up from rest by its props. Each toroid is a closed vortex-ring lattice shedding a free vortex-particle wake (purple-white dots, brighter = stronger); blue dots = air tracers, orange = prop slipstream. Tethered rigid axle.