#annular wing
- Aviocoleopter — An unconventional or experimental type of aircraft (or flight apparatus design) characterized by an annular, cylindrical, or tubular wing that completely surrounds the fuselage or propulsion system. This distinctive structural design, inspired by the elytra of certain beetles (coleoptera), offers theoretical advantages regarding vertical take-off and landing (VTOL), airflow channeling, and reduction of aerodynamic drag at specific angles of attack.