1977 - The Bergfex
The picture shows the elastic deformation of the Bergfex under a load of 700 kg. The sail weighed only 1 kg and was made from spinnacker nylon 32 g/m².
The federal aviation authority issued the airworthiness certification. More than 300 Bergfexes flew accident-free.
1978 - The Superfex
680 units of this manoeuvrable and high performance, 15 kg light-weight mountaineering glider were built.
The Superfex was one of the first gliders to achieve the DHV certification.
1979 - The Jetfex
1981 - The Windfex
The revolutionary new construction with integrated cross-tube and pre-shaped mylar leading edges was sold to over 900 pilots.
The 19,5 kg light-weight glider was also certified for trike use.
1982 - The Minifex
Characterised by extreme manoeuvrability, this glider could be packed down to 1,65 m and had fibre glass wing-tips.
1983 - The Skyfex
Construction of a sickle-shaped high performance glider with 100% double-surface sail. However, neither performance or handling were convincing. Flight characteristics were unconvincing even even with rudders and this project did not get beyond six different prototypes.
Also the development of a duck-wing with 1 m wing depth and 12 m span whose wings could be pushed together like an accordian did not get to the stage of serial production.
1985 - The Topfex
With the Topfex, a forgiving, high-performance glider was achieved. Shortly after serial production began, a large fire that broke out in a neighbouring car factory completely destroyed all Finsterwalder stocks and machinery (see photo).