{ "item_title" : "Air-Screws", "item_author" : [" M. A. S. Riach "], "item_description" : "Air-Screws: An Introduction To The Aerofoil Theory Of Screw Propulsion is a book written by M. A. S. Riach in 1916. The book delves into the science and theory behind the use of screw propulsion in airplanes, including the design and function of air-screws. Riach covers topics such as the principles of aerofoil theory, the history of screw propulsion, the development of air-screw design, and the practical application of air-screws in aviation. The book is aimed at engineers, students, and aviation enthusiasts who are interested in the technical aspects of airplane design and the science behind it. It provides a comprehensive overview of air-screws and their role in aviation, making it a valuable resource for anyone interested in the history and development of airplane technology.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.", "item_img_path" : "https://covers4.booksamillion.com/covers/bam/1/16/393/471/1163934712_b.jpg", "price_data" : { "retail_price" : "23.95", "online_price" : "23.95", "our_price" : "23.95", "club_price" : "23.95", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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