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Chapter 3 A Golden Age While work on perfecting the spray system in the IRT was taking place, Cleveland’s role as the center for the NACA’s icing research was enhanced with the decision to close the ice-prevention program at the Ames Research Center and transfer flight research to AERL/Lewis. Ever since its opening in October 1940, Ames had led the way in developing a practical thermal de-icing system. Emphasizing flight research, the experimenters at Ames, under the driving leadership of Lewis Rodert, had flight- tested various thermal de- and anti-icing designs. The results had led to the development of a complete thermal system, covering the wings, tail surfaces, engine nacelles, windscreen, and other vulnerable parts of the airplane. In the spring of 1948, however, NACA Headquarters decided to consolidate icing research. As it was far easier to move the aircraft than the IRT, the C-46 and B-24 that were being used for flight tests at Ames were transferred to Cleveland, together with meteorologist William Lewis of the Weather Bureau.1 The NACA’s flight research program never missed a beat with the move to the Midwest. One area of continuing interest concerned the physics of icing clouds. Researchers wanted to know how liquid water content and droplet size varied with temperature, pressure, geographic location, synoptic conditions, and topography. The work on this subject that was begun at Ames continued at Cleveland. Numerous flights were made over Lake Erie during which ice was collected on cylinders of dif- ferent diameters that rotated on a common axis and were exposed outside the thermal-protected C-46. The multicylinders were retracted after a flight through icing conditions, disassembled, and the ice was weighed. Comparing the weight of the ice with calculated values of collection efficiency (obtained theoretically) produced data on liquid water content, average droplet size, and droplet-size distribution. Although the data obtained from the rotating cylinder collection system was reliable, the 1 Bugos, “Rodert;” Sharp to NACA Headquarters, 25 May 1948, History Office, GRC. 39PDF Image | History of NASA Icing Research Tunnel
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