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美国政府科技报告
>Preliminary results of an investigation of the effects of spinner shape on the characteristics of an NACA D-type cowl behind a three-blade propeller, including the characteristics of the propeller at negative thrust
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Preliminary results of an investigation of the effects of spinner shape on the characteristics of an NACA D-type cowl behind a three-blade propeller, including the characteristics of the propeller at negative thrust