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The Annular-Wing VTOL Aircraft
Completed
Description
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.
Benefits
The Annular-Wing VTOL Aircraft directly supports NASA's missions through five key applications: 1. Emergency Response & Disaster Relief: 1,500 lb payload capacity enables transport of critical supplies, medical equipment, and personnel to disaster zones without runway access. The annular wing provides inherent stability in crosswinds for operations in challenging weather. 2. Scientific Deployment: Capability to transport heavier scientific equipment to difficult-to-access locations with superior stability for precision instrument deployment and retrieval operations. 3. Aerial Environmental Assessment: Stable flight characteristics are ideal for environmental monitoring, atmospheric sampling, and surveillance missions requiring extended hover capability. 4. Firefighting Support: Water delivery system variant leverages high payload capacity and natural protection of propellers from smoke/debris damage. 5. Polar Operations: Extended range hydrogen configuration supports polar science missions with minimal environmental impact while maintaining thermal efficiency due to the compact profile of the annular wing design. The aircraft's stackable 7-meter wingspan configuration enables rapid deployment with minimal infrastructure—vital for NASA field operations in remote locations. The Annular-Wing VTOL Aircraft targets five key commercial markets: 1. Advanced Air Mobility (AAM): 4-6 person passenger transport exceeding competing eVTOL capacity while maintaining similar footprint. The annular wing enables smoother transitions and quieter operation in urban environments. 2. Defense/Security: Logistics support, reconnaissance, and tactical resupply with high payload capacity and compact profile. The inherent propeller protection increases survivability in contested environments. 3. Medical Transport: Air ambulance applications with full medical equipment capacity and smoother patient transport due to stable flight characteristics provided by the annular wing. 4. Infrastructure Inspection: Pipeline, power line, and remote facility monitoring with extended endurance and efficient transition between hover and high-speed cruise. 5. Agriculture & Forestry: Precision monitoring and treatment with significantly higher payload than drone alternatives, enabling more effective coverage of large areas. The 50% greater payload capacity enables hydrogen fuel cell integration, extending range to 300-1,000 miles compared to 100-200 miles for competitors. Even with range-extending equipment, our aircraft maintains over 1,100 lb payload capacity—exceeding competitors' baseline payloads. Market projections indicate substantial growth opportunities, with the global eVTOL market reaching $30.8 billion by 2030 and the Advanced Air Mobility sector generating $115 billion annually by 2035.
Details
| Technology area | Propulsion Systems |
| Program | Small Business Innovation Research/Small Business Tech Transfer (SBIR/STTR) |
| Lead organization | Glenn Research Center, Cleveland, OH |
| Start date | 2025-09-29 |
| End date | 2026-03-27 |
Project contacts
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How to get involved
This is a mature technology (TRL 7+) — the realistic path in is usually NASA's Technology Transfer Program: licensing an existing NASA patent, or a Space Act Agreement to use NASA facilities/expertise directly. NASA also runs a startup licensing program with no upfront fee for companies formed to commercialize a specific NASA technology.
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