N551X

N551X is a Sonex Aircraft Sonex, a single-engine piston aircraft operated by HELM THOMAS N. SkyMeter has tracked 56 flights totalling 18 hours of airtime via ADS-B across 2 callsigns. The most frequent segment is KATW to KATW. Service window in our records spans 360 days. Of those flights, 8 (14.3%) carry at least one detected incident — go-around, unstable approach, stall warning, or runway excursion. The Sonex Aircraft Sonex has a maximum takeoff weight of 1,150 lb, light wake category.

About the Sonex Aircraft Sonex

The Sonex is a compact, all-metal sport aircraft designed by Sonex Aircraft of Oshkosh, Wisconsin, and introduced in the early 2000s as an affordable kit plane for amateur builders. With its distinctive Y-tail configuration, folding wings, and aerobatic capability, the Sonex carved out a niche among homebuilders seeking a nimble, economical aircraft that could be constructed in a home garage and trailered to the airport. Powered by a variety of engines ranging from converted Volkswagen automotive units to purpose-built AeroVee and Jabiru powerplants producing 80 to 120 horsepower, the Sonex delivers spirited performance with cruise speeds around 140 knots and fuel burns as low as 4 gallons per hour.

The design emphasizes simplicity and low operating costs, with a maximum takeoff weight of just 1,150 pounds and construction techniques accessible to first-time builders. Its short takeoff and landing performance, combined with responsive handling, has made it popular for both recreational flying and sport aerobatics, while the kit's relatively quick build time and modest price point have attracted hundreds of builders worldwide. SkyMeter has tracked flights across airframes and operators, with among the observed operators.