Overair (Karem) Butterfly

Quick Summary

Overair (previously Karem Aircraft) is one of five companies selected by Uber to be partners for the UberAIR initiative, and gained a large amount of public attention and traction from this announcement.

The company was founded in 2004 by Abe Karem, founder ofLeading Systems and Frontier Systems. At Frontier Systems, Abe led the development of Optimum Speed Rotor (OSR) technology and unmanned aerial vehicle (UAV) systems, as well as the A160 Hummingbird Optimum-Speed Rotor UAV, now owned by Boeing.

Karem Aircraft became an independent company and rebranded as Overair Inc. in January of 2020, following a $25 million investment by Hanwha Systems. Upon being approved for the investment, Hanwha Systems became a 30% owner of Overair, Inc.

Overair, formerly Karem Aircraft, based in Santa Ana, CA, USA

Stage of Development

Preliminary Design

Prototype Build

Flight Testing


Commercially Operating
Technical Details

Aircraft Type: Winged VTOL, Intercity

Powerplant: All-Electric

Range: 100 miles (161 km)

Top Speed: 150-200 mph (240-322 km/h)

Propeller Configuration: Quad tiltrotor with Optimum Speed Tiltrotor (OSTR) technology; large rotor, slow turning propeller.

Passenger/Payload Capacity: 1 pilot, 4 passengers

Autonomy Level: Piloted

Dimensions: Unknown

From Karem:

Our Take on Karem

Under the name of Karem Aircraft, the company announced a partnership with Uber to potentially provide air vehicles for its urban air mobility initiative, Uber Air. Since Overair is a smaller firm than the large aerospace corporations that have dominated the industry for decades, they'll most likely be able to accommodate some of the requests that Uber has that other companies wouldn't. However, their largest hurdle is completing their preliminary design process and moving forward with production of a prototype and testing of the Butterfly. Overair currently plans to have an operable ride-sharing eVTOL aircraft available by 2023; their continued focus on battery and aerodynamic efficiency has the potential to give the Butterfly a economic advantage over the other competitors in the urban air vehicle market.