Zhukovsky N.E (Emeritus Professor).Vetchinkin V.P. (Mechanical Engineer). Vortex theory of propeller. Calculation of propeller. In Russian/Zhukovskiy N.E (zasluzhennyy professor).Vetchinkin V.P.(inzhener mekhanik). Vikhrevaya teoriya grebnogo vinta.Raschet grebnogo vinta. Proceedings of the Aviation Calculation and Testing Bureau established by the Directorate of the Military Air Fleet at the Moscow Higher Technical School. Issues 3 and 4. Moscow. Publication of the Directorate of the Military Air Fleet. 1918. 99 and 129 p. Please contact us for details on condition of available copies of the book. SKUalbf5dcdb840784bfff