Military aeroplanes, simplified, enlarged; an explanatory consideration of their characteristics, performances, construction, maintenance, and operation, specifically arranged for the use of aviators and students . peed. It is unnecessary here to take up the determinationsof these forms. If the stream lines flow smoothly past an object, andclose up again without eddies, it follows that the only resistance ex-perienced is frictional. There is hardly any shape, however, whichdoes not create some small eddy resistance. 45 There are many ways of determining the manner in which the airflows past an
Military aeroplanes, simplified, enlarged; an explanatory consideration of their characteristics, performances, construction, maintenance, and operation, specifically arranged for the use of aviators and students . peed. It is unnecessary here to take up the determinationsof these forms. If the stream lines flow smoothly past an object, andclose up again without eddies, it follows that the only resistance ex-perienced is frictional. There is hardly any shape, however, whichdoes not create some small eddy resistance. 45 There are many ways of determining the manner in which the airflows past an object, such as noting the directions in which light silkthreads are blown, or introducing smoke or particles into the air andphotographing it. Ammonium Chloride is a very convenient smoke. Importance of Visualizing the Air. It is of great value in aeroplane work, to become accustomed tovisualize the streamline flow of air, and ability to see the air oftensolves many problems of stability and reduction in resistance, with-out any recourse to mathematics or measurements. Besides this,there is offered in. the study of air flow by photography, a field of in-vestigation of great promise and absorbing THE AIR FLOW OVER A WINDSHIELD VIZUALIZED It is a common experience that in a wind, at the front of a flatsurface, there is a dead region of air, where no wind is felt. Photo-graphs show this air cushion clearly. In stability discussions, effect of following planes, interferenceand propeller stream action, priceless secrets would be revealed if theair could be followed in its every movement.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectairplanes, bookyear19
