Going back between the CAD model and the design in the patent by Sharrow ... (Heading image: The toroidal propeller’s details in the CAD software. (Credit: rctestflight) ...
Designed by [Chip Gracey] and released in 2006, the 32-bit octal core Propeller has built up a loyal fan base. Many of those fans have created development tools for the Propeller, from libraries ...