India’s Electric Flying Boat Hummingbird Prepares for Sea Trials by December 2026.
IIT Madras Startup Waterfly Tests Electric Flying Boat for India’s Coastal Cargo Routes.
Waterfly Technologies’s Hummingbird eBoat: Indian deep-tech startup Waterfly Technologies is preparing to take its electric Hummingbird craft from controlled lake tests to the open sea, with a trial planned between Chennai and Puducherry by December 2026. The development marks an important step in the company’s effort to build a new form of coastal transport that combines features of aircraft and boats.
Incubated at the Indian Institute of Technology Madras (IIT Madras), Waterfly has developed a 300-kilogramme prototype designed to travel just above the water’s surface rather than fly at conventional aircraft altitudes or move through the water like a ferry. The company hopes the technology could eventually support cargo deliveries along India’s coastline and to its islands, including supplies for offshore oil facilities.
The proposed sea trial will test whether the craft can operate effectively in open-water conditions, moving beyond the controlled environment of earlier demonstrations. While Waterfly has outlined ambitious plans for passenger transport, long-distance journeys and container-scale cargo operations, its immediate priority is cargo logistics.
What is Hummingbird and how does it work?
Hummingbird is an electric craft built around a concept known as Wing-in-Ground (WIG) effect technology. Instead of flying high above the ground like a conventional aeroplane, a WIG craft operates close to a surface, such as water, where the interaction between its wings and the surface can improve aerodynamic efficiency.
When an aircraft flies, its wings generate lift, but they also create induced drag. Flying close to a surface can reduce this drag under suitable conditions, allowing a wing to produce lift more efficiently. This phenomenon is known as the ground effect.
In Hummingbird’s case, the water acts as the surface beneath the wings. The intended result is a vehicle that can skim above the sea while benefiting from the aerodynamic characteristics of low-altitude flight.
The concept offers a potential alternative to conventional boats and aircraft for certain journeys. A boat travels through water, where resistance can limit speed, while an aeroplane requires sufficient altitude and conventional aviation infrastructure. A WIG craft seeks to occupy a middle ground, operating close to the water’s surface.
However, this operating principle also presents challenges. Waves, changing wind conditions and variations in sea state can affect stability and control. The technology’s commercial usefulness will therefore depend on how safely and reliably the craft performs outside controlled test environments.
From a 30kg prototype to a 300kg craft
Waterfly developed its technology in stages, beginning with a 30-kilogramme prototype built over approximately six months. The early version was intended to help the team understand the challenges of taking off from water and transitioning into flight.
The startup then spent another six months scaling the design to a 300-kilogramme prototype, a substantial increase in size and weight.
The larger craft underwent testing above Kaveripakkam Lake in Tamil Nadu. During these tests, the prototype operated at around 1.5 metres above the water, allowing the team to examine its performance in ground-effect conditions.
Waterfly unveiled Hummingbird in Chennai on 11 October 2026, in the presence of Prime Minister Narendra Modi. Co-founder Keshav Kumar Choudhary said the planned ocean trial would use the same 300-kilogramme craft that had already undergone lake testing.
The move to the sea is significant because a lake cannot fully reproduce the conditions encountered in coastal waters. Waves, wind, saltwater exposure and changing weather can all introduce new engineering and operational challenges.
The December trial is expected to provide a more realistic assessment of the craft’s ability to take off, maintain stability and operate over open water.
Why Waterfly is focusing on cargo first
Although Waterfly has discussed the possibility of passenger services, the company’s initial commercial focus is coastal and island cargo transport.
India has a long coastline and numerous islands, while offshore industries require regular movement of equipment, supplies and other essential goods. Delivering cargo to some of these locations can involve long journeys, specialised vessels or logistical arrangements that add time and expense.
An electric craft capable of carrying cargo quickly between coastal locations could offer an alternative for selected routes, provided it can demonstrate reliable operations and competitive costs.
Waterfly is also exploring applications in offshore oil fields, where regular deliveries are needed to support industrial operations.
The startup has floated the possibility of connecting Chennai and Kolkata in around three hours, with fares as low as **US$6.31 (₹600)**. This is an ambition for future transport services, rather than a demonstrated travel time or confirmed commercial fare. Its immediate cargo-first strategy reflects the need to establish technical reliability and commercial viability before expanding into other markets.
Can Hummingbird travel 1,000 kilometres on one charge?
Waterfly estimates that the craft could eventually achieve a range of around 1,000 kilometres on a single charge. The company has also suggested that charging stops could take approximately 15 minutes.
These figures are projections from the startup, not independently established operating results from the planned sea trial.
Achieving long distances with an electric vehicle requires careful management of battery capacity, propulsion efficiency, payload and operating conditions. For a craft travelling close to the sea, weather and wave conditions may also influence energy consumption and operational limits.
Waterfly is exploring whether ships equipped with solar panels and batteries could act as charging points at sea. If technically and commercially practical, such a system could help support routes where conventional charging infrastructure is unavailable.
However, establishing a dependable charging network would require suitable vessels, energy storage, charging equipment and operational coordination. The availability of charging points would also need to match the craft’s route, range and safety requirements.
The company has identified Southeast Asia as an initial target market for a longer-term version designed to carry a standard 20-foot shipping container. That ambition would require a considerably larger cargo capability and further development beyond the current prototype.
Manufacturing, certification and costs
Waterfly says it is manufacturing the technology in-house at a facility in Sriperumbudur, Tamil Nadu, with the capacity to produce two 300-kilogramme craft a week.
The company is also in discussions with classification and certification agencies, including Bureau Veritas, to assess the requirements for its proposed cargo operations.
Certification is a crucial step because a prototype that performs during a demonstration is not automatically ready for routine commercial service. The craft will need to meet applicable safety and operational requirements, including those relevant to its design, intended use and operating environment.
Waterfly is targeting transport costs below US$0.11 (₹10) per tonne-kilometre. This measure expresses the cost of moving one tonne of cargo over one kilometre and is commonly used to compare freight transport economics.
The figure is a company target based on its current design and operating-cost projections. Actual costs will depend on factors such as payload, battery performance, maintenance, charging infrastructure, crew requirements and utilisation rates.
The proposed cost advantage will need to be assessed against conventional coastal shipping and other transport options once the craft has demonstrated repeatable performance.
What happens after the sea trial?
The December 2026 trial will be a technical milestone, not a commercial launch. Waterfly will need to establish that Hummingbird can operate safely and consistently in open-water conditions before its proposed cargo services can become a practical reality.
Successful testing could provide the company with valuable information for refining the design, improving operational procedures and progressing towards certification. Further work would still be required to establish suitable routes, charging arrangements, maintenance support and commercial partnerships.
The larger ambitions, including 1,000-kilometre range estimates and container-scale cargo transport, remain subject to further development and validation.
Hummingbird represents an emerging attempt to apply electric propulsion and ground-effect aerodynamics to coastal logistics. If Waterfly can translate its prototype’s performance into a reliable and economical transport service, the technology could eventually offer another option for moving goods along India’s coast and to remote maritime locations.
For now, the open-sea trial will be the next important test of whether the company’s flying-boat concept can move closer to commercial reality.