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“We Freeze to Please” Figure 5–12. Electro-impulse de-icing equipment for McDonnell Douglas tests in the IRT, 1981. (NASA C-81-6007) length, measured 44 inches high and 22 inches wide. An 80-inch-diameter fan, driven by a 200-horsepower rotary motor, produced airspeeds of up to 210 miles per hour. Five spray bars used twenty NASA-designed standard and mod-1 nozzles.22 NASA technology also assisted in the construction of a new Boeing icing tunnel. The existing tunnel at Boeing had an 18-inch by 30-inch test section and was used only for development work. With an upcoming program for the advanced 777 transport, Boeing decided that the company could save a good deal of money by building a larger facility to help with the airplane’s icing certification in 1986. George E. Cain was respon- sible for designing and building a new tunnel with 4-foot by 6-foot and 5-foot by 8-foot test sections. And the job had to be done within three years. “My first action,” he 22 David Sweet to Leary, 24 May 2000. 102PDF Image | History of NASA Icing Research Tunnel
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