Coandă's colleague at Huyck Corporation, G. Harry Stine—a rocket scientist, author and "the father of American model rocketry"—stated in his book "The Hopeful Future" that "there were several jet-propelled aircraft in existence at an early time-the Coandă-1910 jet and the 1938 Caproni Campini N.1, the pure jet aircraft flight was made in Germany in 1938". Rolf Sonnemann and Klaus Krug from the University of Technology of Dresden, mentioned in passing in their 1987 book "Technik und Technikwissenschaften in der Geschichte" ("Technology and Technical Sciences in History") that the Coandă-1910 was the world's first jet.