The Virus SW 121 is a single-engine, two-seat, light aircraft, manufactured by Pipistrel in Slovenia and Italy. It was first introduced in 1999, based on the design of the Pipistrel Sinus and is sold as an ultralight, homebuilt kit, and light-sport aircraft. It has been produced in a number of variants with different engines, wingspans, and undercarriage configurations. The Virus SW 121 is used by private individuals as well as flight schools worldwide and it can be equipped with a full airframe emergency recovery parachute system.
In 2012, a Slovenian pilot flew around-the-world in a Virus SW914 and was the first person to complete 54,000 nautical miles (100,000 km) flight without a co-pilot. Another thing to mention is a Virus SW 128, which is the first electric aircraft, powered by an Emrax 75 horsepower (58 kW) electric engine, has a certificate issued from the European Aviation Safety Agency (EASA) in June 2020.
For a cross-country flight, the maximum speed is 153 knots (283 km/h) with the maximum flight range of 780 nautical miles (1,450 km) and the maximum service ceiling being 22,300 feet (6,800 meters).
The Virus SW 121 is flyable in the next generation of Microsoft Flight Simulator Premium Deluxe Edition.