{ "item_title" : "Calculation of Counterrotating Propellers", "item_author" : [" Nasa Technical Reports Server (Ntrs)", "F. Ginzel "], "item_description" : "A method for calculation of a counterrotating propeller which is similar to Walchner's method for calculation of the single propeller in the free air stream is developed and compared with measurements. Several dimensions which are important for the design are given end simple formulas for the gain in efficiency derived. Finally a survey of the behavior of the propeller for various operating conditions is presented.", "item_img_path" : "https://covers4.booksamillion.com/covers/bam/1/28/724/469/1287244696_b.jpg", "price_data" : { "retail_price" : "17.75", "online_price" : "17.75", "our_price" : "17.75", "club_price" : "17.75", "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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