Beaver ultralights have evolved as designs over time, have been produced by several companies and remain in production in the 21st century. The first model Beaver was the RX-28, a simple lightweight single-seat aircraft that was intended to comply with the US FAR 103 Ultralight Vehicles category, including the category's maximum 254 lb (115 kg) empty weight. The model designation indicated that it was Rotax-28 hp as it was powered by the 28 hp (21 kW) Rotax 277 single-cylinder, two-stroke powerplant. With this engine the RX-28 had an empty weight of 232 lb (105 kg). The availability of the 35 hp (26 kW) Rotax 377 engine lead to a higher-powered version of the RX-28, which was designated the RX-35. This Beaver model was fitted with floats and continued in production by Spectrum Aircraft until they ceased business in 1992. Building on the success of the single-seat Beaver models, Spectrum Aircraft introduced the two-place Beaver RX 550 in 1986 and it quickly became the most popular ultralight trainer in Canada. The combination of its predictable and docile handling, along with the reliable Rotax 503 50 hp (37 kW) engine, ensured its success. From the Spectrum Aeronautics website: Since its first flight in 1983 the Beaver has proven so far very popular in service, both with flight schools and private owners for its ruggedness and easy-to-handle characteristics. Although being through many manufacturers and out of production , the aircraft has enjoyed an illustrious history that proudly owns an excellent world-wide reputation for safety and good longevity. However, the Beaver owners and enthusiasts don’t have to wait for long because this Canadian iconic ultralight aircraft will be back in production in 2020 with two variants as Beaver RX 550, and Beaver RX SS. For more details of the development, design operational history and seven variants, click here. Specifications below are for the single seat RX SS model. RX SS Single seat RX550 two seater
