Design and evidence-gated refinement of a 3-D-printable smooth-tip toroidal rotor
The Poltergeist rotor program: a reproducible diagnostic improvement, its costs, and the evidence still missing.
Poltergeist
We closed the rotor tip. The evidence loop is still open.
A quadrotor prop with no blade tips: what the Poltergeist toroidal rotor program produced when every number had to survive its own audit.