The Annular-Wing VTOL Aircraft

The Annular-Wing VTOL Aircraft introduces a redefinitive aerodynamic configuration built around a circular wing design that addresses critical limitations in existing electric vertical takeoff and landing (eVTOL) platforms. Our innovation integrates a fixed-pitch coaxial lift system within an annular wing architecture, enabling 1,500 lb payload capacity—50% more than competing designs—while achieving exceptional energy efficiency of 2,800 J/lb-mile. Key innovations include: (1) a propeller parking system that eliminates transition drag by aligning lift rotors with airflow during cruise; (2) below-fuselage propulsion that optimizes propwash utilization; (3) streamlined flight mode transitions without complex tilting mechanisms; and (4) hydrogen fuel cell integration capability for extended range operations. Phase I funding will support high-fidelity CFD modeling, propeller parking mechanism development, control system refinement, and scaled prototype flight testing. Our 1-meter subscale prototype has already validated core aerodynamic principles through 50+ successful flight tests. Primary markets include NASA applications (emergency response, scientific deployment), Advanced Air Mobility (4-6 passenger transport), medical evacuation, and defense/security operations. The unique combination of helicopter-class payload with fixed-wing efficiency positions this platform to capture significant market share within the projected $30.8B eVTOL market by 2030.