That obviously requires a winding ring that can be opened up to allow the toroid form to be inserted; [Sandeep] chose to make his winding ring out of plywood with a slit in it. Carrying the wire ...

[PDF via NewAtlas] Inspired by some of the experiments with “ring wings” in the early 20th Century, researchers iterated on various toroidal propeller geometries until arriving at one that ...

What characterizes these excitations, or modes, is a toroidal distribution of currents, which results in the formation of vortex-like structures. A classic example is smoke rings, the ...