The Chu Hummingbird was an experimental co-axial helicopter developed by Chinese aviation engineer Major General C.J. Chu (朱家仁) 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?
The answer to this question is:
Mean Of Transportation