from Wikipedia : The 304 was the second and last glider developed by Glasflügel in cooperation with Schempp-Hirth. It superseded theGlasflügel Mosquito.The principal designer of the 304 was Martin Hansen, known for his role in the design of the Akaflieg Braunschweig SB-11. The glider continued the Glasflügel tradition of innovation: the parallelogram control stick, combined trailing edge flaps and airbrakes, automatic trimming, heel-operated brakes, automatic control connections, the extremely easy assembly of the wings and tailplane, the parallelogram forward-opening canopy and lifting instrument panel are Glasflügel innovations largely copied by other manufacturers.The prototype flew for the first time in May 1980 and entered production shortly after. Glasflügel was financially struggling at that time, following the untimely death of Eugen Hänle, the founder of the company, in 1975. A partnership with Schempp-Hirth led to a surrender of technology. Lacking investment and an energetic leadership, the company folded in 1982.A small batch was later built by the Jastreb company in Yugoslavia as the 304B.The 304 is sometimes referred to as the H-304, which is not correct, as the H applies only to the Glasflügel sailplanes designed principally by Wolfgang Hütter.