Overair has revealed the commercial design of its revolutionary Butterfly eVTOL, which the company says is the culmination of decades of military-grade vertical flight technology.

Until now, Overair’s rapidly growing team of engineers and technicians have been operating in stealth mode – integrating technologies from more than 20 years of aerospace innovation led by Abe Karem.

Amid the rising focus on reducing aviation’s carbon footprint, Overair expects to certify Butterfly with the Federal Aviation Administration (FAA) in 2025.

Following certification, the company will launch commercial operations in the US and South Korea, where it will work with Hanwha Systems – which has invested $25 million in Overair and now owns 30 per cent of the company.

Both companies are in the final stages of developing an electric propulsion system and will soon begin initial tests.

The Korean defense contractor has invested $25 million in Overair and now owns 30 per cent of the company, which is currently developing the first prototype of Karem Aircraft’s Butterfly eVTOL model.

Ben Tigner, Overair CEO, said: “Overair intends to commercialise Butterfly’s competitive advantages to become a global leader in advanced air mobility, vertically integrating to meet demand as a manufacturer, maintainer, and operator. “This is just a fundamentally different type of aircraft.

“Butterfly is a transportation system optimised for safety, utilisation, passenger experience, and affordability. Our goal is to become a trusted part of our riders’ daily routines and a trusted partner for the communities we serve.”

Leveraging that legacy of the Department of Defense and privately backed technology, Overair says Butterfly is designed to be the most robust, efficient, and quiet aircraft in its class – producing zero emissions when in flight.

Butterfly’s unique capability stems from its breakthrough propulsion system, known as Optimum Speed Propulsion (OSP). Butterfly’s four large propellers spin slowly in hover and even slower cruise, resulting in two primary aerodynamic advantages.

The props are so efficient that hover flight consumes only a small fraction of the available motor power, giving Butterfly extra payload capacity and power margins to operate safely in challenging environmental conditions. As the slow-turning props produce very little noise, they optimise Butterfly for high-density routes over sensitive communities.

Butterfly’s novel design also combines the low energy and maintenance costs of all-electric vehicles with the robust flight qualities of OSP, unlocking a reliable aviation solution over congested metropolitan areas.