Question: The Albatros L 79 Kobold was a single-seat German aerobatic aircraft of the 1920s and 1930s, the kobold (occasionally cobold) is which type of entity, stemming from Germanic mythology, and surviving into modern times in German folklore?
Sentence (from "Albatros L 79"): It was a single-bay biplane with unstaggered, equal-span wings that had a symmetrical airfoil intended to ensure performance during inverted flight.
Relevant evidence: No