Indian aerospace Start-Up Nalwa Aero has achieved a significant milestone after successfully flight-testing its scaled electric vertical take-off and landing (eVTOL) aircraft featuring an unconventional box-wing design, demonstrating both hovering and forward flight using electric propulsion and an all-tilting-rotor configuration.

The successful trials mark the first known flights of the company's experimental aircraft concept and represent an important step towards the development of a full-scale five-seat aircraft intended for passenger transport, air ambulance services, cargo operations, tourism applications and defence missions.


Based in Punjab, Nalwa Aero stated that the preliminary flight tests confirmed the aircraft's distinctive wing arrangement can support both vertical lift and forward flight, validating key aspects of the design before the development of a larger operational platform.

Unlike most emerging electric air taxi projects, the company has adopted a box-wing configuration in which the forward and rear wings are connected at their tips, creating a closed-loop aerodynamic structure. The concept is designed to increase aerodynamic efficiency while enhancing structural strength, potentially making it suitable for larger electric aircraft.

Founder and Chief Executive Officer Kuljeet Singh Sandhu described the achievement as the result of years of engineering effort, redesigns and perseverance.

"They said it was impossible. We believed otherwise. Today, we made it fly!" Sandhu said.

He further stated: "We believe this represents a WORLD-FIRST achievement – successfully demonstrating an electric Box-Wing eVTOL aircraft with this unique all-tilting-rotor configuration, not previously achieved anywhere in the world, to this scale."

The company has not revealed the exact dimensions of the demonstrator aircraft, the number of flights conducted or the duration of the testing campaign. The demonstration should be viewed as an early-stage technology validation rather than a test of the final passenger-carrying aircraft.

India's Civil Aviation Minister K. Ram Mohan Naidu welcomed the development after meeting Sandhu and Nalwa Aero Chief Technology Officer Nelson Salas. The minister expressed support for the company's efforts and highlighted the potential of advanced air mobility technologies in India.

"With such deep-tech innovations, we can transform urban mobility through flying taxis, air ambulances and even cargo flights, opening up exciting new possibilities!" he said.

The aircraft's design traces its roots to aerodynamic principles explored more than a century ago by German scientist Ludwig Prandtl, widely regarded as one of the founders of modern aerodynamics. Instead of relying on a traditional single-wing arrangement with a separate tailplane, the box-wing architecture employs two lifting surfaces connected at their outer ends.

Engineers believe this configuration can reduce wingtip vortices and other aerodynamic losses that normally affect conventional aircraft. The arrangement may also improve structural load distribution, a particularly valuable characteristic for electric aircraft where efficiency is critical because of battery weight and energy-storage limitations.

According to Nalwa Aero, preliminary internal studies suggest the design could achieve up to 40% improvements in selected aerodynamic efficiency parameters compared with certain conventional aircraft designs. However, these results remain subject to further experimental validation and do not represent a confirmed 40% increase in operational range.

Equally distinctive is the aircraft's propulsion architecture. The full-scale design is expected to feature eight tilting rotors positioned across the front and rear wings. These rotors provide vertical lift during take-off and landing before rotating forward to generate thrust during cruise flight.

This approach allows the aircraft to operate like a helicopter during take-off and landing while benefiting from the efficiency of wing-borne flight during forward travel.

The transition between vertical and horizontal flight remains one of the most technically demanding aspects of tiltrotor aircraft development. Flight-control systems must continuously manage changing aerodynamic forces, airflow patterns and rotor orientation as lift transitions from the propulsion system to the wings.

While the company confirmed successful hovering and forward-flight demonstrations, it has not disclosed whether the test campaign included a complete transition between vertical and wing-borne flight modes.

Under its Aphulas development effort, Nalwa Aero is pursuing a full-sized aircraft platform intended for civilian, medical, commercial and defence applications.

The company has outlined an ambitious specification that includes a maximum take-off weight of 4,000 kg, a payload capacity of 1,000 kg, a cruising speed of 350 km/h, an all-electric range of 450 km and approximately 90 minutes of endurance.

Nalwa Aero is also examining a hybrid hydrogen-electric variant capable of travelling more than 1,500 km, potentially expanding the operational scope of the aircraft beyond urban air mobility missions.

The planned aircraft will incorporate fly-by-wire controls, autonomous capabilities and flight-envelope protection systems. These technologies use computers to manage flight-control inputs and enhance safety by preventing pilots from inadvertently exceeding operational limits.

The company believes the aircraft could play an important role in regions where road transport is slow and conventional aviation infrastructure is limited, providing new options for passenger mobility, emergency medical services, cargo delivery and disaster response.

Before reaching operational service, the aircraft must undergo extensive engineering validation. Development activities include aerodynamic simulations, structural analysis, vibration testing, hardware-in-the-loop evaluations, propulsion testing and verification of flight-control systems.

Engineers have to assess how the connected wings manage structural loads, how airflow behaves around the tilting rotors and how the aircraft responds during different phases of flight. Particular attention is being paid to batteries, electric motors, cooling systems, power-distribution architecture and the rotor-tilting mechanisms.

Ground-based testing remains essential for identifying potential issues such as excessive vibration or flutter, a dangerous phenomenon caused by interactions between aerodynamic forces and structural oscillations. For Sandhu, the milestone carries considerable personal significance. He recalled leaving Canada to pursue the vision in India and spoke about the numerous setbacks encountered during development.

"A century-old aerodynamic vision. Years of failures, sacrifices, and perseverance. And today, a historic milestone for Indian aviation," he wrote.

He also highlighted the contribution of CTO Nelson Salas, who relocated from the United States to India with his family to support the project after accumulating more than 28 years of aircraft-development experience.

"We faced failures, doubts, financial challenges, redesigns, and countless sleepless nights," Sandhu said.

"And when I watched our aircraft lift off the ground, I didn't just see a machine flying. I saw every failure, every sleepless night, every sacrifice, and every reason we refused to give up."

Nalwa Aero is registered with India's Department for Promotion of Industry and Internal Trade and emphasises that its aircraft technologies are being designed and developed domestically. The company continues to pursue both civilian and tactical applications, particularly aircraft capable of operating without conventional runways.

A key regulatory milestone was achieved when the company received Design Organisation Approval from the Directorate General of Civil Aviation in June 2025 for eVTOL aircraft in the five-seat-and-above category. Its type-certification application was subsequently accepted in January 2026.

These approvals allow development activities to progress but do not constitute certification for commercial operations. The company must still demonstrate the safety, reliability and performance of the full-scale aircraft through a comprehensive testing and certification campaign.

Industry observers view the achievement as an important step for India's emerging advanced air mobility sector, as the country seeks to develop indigenous next-generation aviation technologies.

The successful flight trials provide the first airborne evidence that Nalwa Aero's unconventional combination of box-wing aerodynamics, electric propulsion and tilting-rotor technology can achieve controlled vertical and forward flight, although significant development, testing and regulatory work remains before the aircraft enters service.

Agencies