HB-YIV

HB-YIV is a Pipistrel Virus SW 121, a single-engine piston aircraft. SkyMeter has tracked 90 flights totalling 81 hours of airtime via ADS-B. The most frequent segment is LSZH to LSZH. Service window in our records spans 408 days. Of those flights, 4 (4.4%) carry at least one detected incident: a go-around, unstable approach, stall warning, or runway excursion. The Pipistrel Virus SW 121 has a maximum takeoff weight of 1,320 lb, light wake category.

About the Pipistrel Virus SW 121

The Pipistrel Virus SW is a Slovenian-designed two-seat light sport aircraft that has become one of the most efficient and technologically advanced aircraft in the ultralight category. Built by Pipistrel Aircraft of Ajdovščina, Slovenia, the Virus family first flew in 2000 and quickly gained recognition for its exceptional fuel efficiency, achieving as low as 3 liters per 100 kilometers in cruise, performance that earned it multiple NASA and aviation efficiency awards. The SW 121 variant is powered by a Rotax 912 series engine and features a composite airframe with a distinctive high-aspect-ratio wing optimized for glider-like efficiency.

What sets the Virus apart from typical light sport aircraft is its motorsport-derived aerodynamics and attention to drag reduction. The aircraft's sleek fuselage, retractable landing gear option, and laminar-flow wing design deliver cruise speeds around 135 knots while sipping fuel at rates that shame most GA singles. Pipistrel's engineering philosophy emphasizes green aviation technology, and the Virus served as the testbed for the company's electric propulsion experiments that later led to the Alpha Electro trainer. The type is certified under both FAR Part 23 in the United States and EASA CS-23 in Europe, making it one of the few ultralights to meet full certification standards rather than operating under experimental or LSA limitations.

The Virus has found a niche among owner-pilots who prioritize efficiency and modern avionics over cabin space, as well as flight schools seeking low operating costs. Its handling characteristics are often described as responsive and forgiving, with docile stall behavior and excellent visibility from the bubble canopy. The aircraft's 1,320-pound maximum takeoff weight places it at the upper limit of the light sport category in the U.S., and its 37-knot stall speed in landing configuration makes it accessible to sport pilot certificate holders. SkyMeter has tracked flights across airframes and operators, with the largest observed operator.