George Applebay's first sailplane design constructed was the Applebay GA-II Chiricahua, a wood and fabric glider for the FAI Standard Class that first flew in 1970. Only one Chiricahua was built. In 1975 he flew the prototype Applebay GA-111 Mescalero, a mixed metal and fiberglassFAI Open Class glider. The Mescalero was intended for production, but Applebay decided to concentrate on his next design, the all-fiberglass Zuni for the 15m class instead and only one Mescalero was completed. The Zuni was designed in 1975.[4][5][6]
Flight testing of the Zuni started in November 1976 and the aircraft was put into production by a new company Applebay formed for the purpose called Aero Tek. The aircraft was quite competitive in 1976 and placed well in regional competitions. A fatal accident, as a result of a structural failure, in May 1977 forced Aero Tek out of business in 1978, but a new company was formed to continue Zuni production, Applebay Sailplanes. The improved Zuni II, with Kevlar construction was introduced, but production ended in 1983 after only 20 Zunis in total had been completed, due to the lack of competitiveness of the design by that date and the high US dollar, that made competition with European imports difficult.[2][3][6]