The Wolfsberg (Elektor) Raven was originally intended as a versatile, cheap, simple and robust aircraft to replace a multitide of types flying in harsh conditions in 3rd world countries. Development was hampered when Letov, the maker of the wing, declared bankruptcy and initial flight tests revealed the need for a thorough redesign, resulting eventually in the Corvus 1F. Three protopes were built but the protracted development and lack of funds brought an end to the project, with this third example now being on display at Koněšín.