Please answer the following question: The Chu Hummingbird was an experimental co-axial helicopter developed by Chinese aviation engineer Major General C.J. Chu () in China during the 1940s in two versions designated the Model A and Model B.Model A was a single seat double rotor test craft used for static (non-flying) test and made its debut in 1945. This model was destroyed when the rotor broke off. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Mean Of Transportation