The Brditschka HB-3, HB-21 and HB-23 are a family of motor gliders of unorthodox configuration developed in Austria in the early 1970s. == Design and development == The unusual design was based on work done by Fritz Raab in Germany in the 1960s.
The Brditschka HB-3, HB-21 and HB-23 are a family of motor gliders of unorthodox configuration developed in Austria in the early 1970s. == Design and development == The unusual design was based on work done by Fritz Raab in Germany in the 1960s.
Source: Wikipedia "Brditschka HB-3" · CC BY-SA 4.0
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