[1][2][3] Sprectrum's first product was the RX-28 Beaver, a single-seat, high wing ultralight aircraft powered by a 28 hp (21 kW) Rotax 277 single cylinder, two stroke powerplant.

[1] In 1986 the company started production of a two-seat version of the Beaver, designated the RX 550 and powered by a Rotax 503 50 hp (37 kW) engine.

This model proved very popular as both a trainer and for private use and propelled the company into the forefront of ultralight aircraft production in North America.

Powered by a 40 hp (30 kW) Rotax 447 engine and with a wing derived from the RX 550 Plus design, this aircraft remains in kit production.

This improved RX 650 incorporated 186 changes over the previous version and was designated the SS-11 Skywatch and the company placed the aircraft in the Canadian AULA category.