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Onex Makes First Flight

Folding-wing design reaches 165 mph

Onex 1NX takes off on Wittman Regional Airport's Runway 27 on January 27, 2011, with Sonex CEO Jeremy Monnett at the controls.

John Monnett (right) congratulates Jeremy Monnett (left) on a successful first flight of the Onex.

January 28, 2011 — Sonex’s newest kit aircraft, the Onex, made its first flight Thursday (January 27) from Wittman Regional Airport in Oshkosh, Wisconsin. The single-place, all-metal monoplane that features folding wings was flown by Sonex Aircraft CEO and Onex designer Jeremy Monnett, who reported reaching speeds of 165 mph. The Onex, which will have the option for both conventional and tricycle gear, was designed like the others in the Sonex line to provide simplicity and affordability in an aircraft project.

“The airplane is sweet," Jeremy Monnett commented upon landing. "It feels great!" He thanked the entire development team for its efforts and characterized his first impressions of the aircraft handling as “excellent.”

The first flight took place following an airworthiness certification by Designated Airworthiness Examiner and EAA Homebuilders Community Manager Joe Norris. The Onex features Sonex’s 80-hp AeroVee engine, 14-gallon fuel capacity, a top speed of 216 mph, and a max gross weight of 850 pounds (310 pound payload). The “Corsair-style” folding wing feature will allow the aircraft to fit into a garage as small as 7 feet and the wing panels are completely removable for transport.

Read about the Onex and Subsonex load tests

Next steps in the development of the Onex include a complete and thorough flight testing program to explore the full performance envelope and flight characteristics of the aircraft, along with completion, first flight, and testing of Onex prototype No. 2, a tricycle gear version.

The Onex is one of several concepts currently under development at Sonex’s Hornets’ Nest R&D facility. Others include the Subsonex personal jet, AeroVee Turbo engine, and Electric Sport Aircraft (ESA).

Onex first flight video


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