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“We Freeze to Please” Figure 8–12. Icing tests of Sikorsky S-92 inlet in the IRT, 1998. (NASA C-98-1348) tests are rather lengthy and grueling,” researcher Colin S. Bidwell explained, “because of the time required to install the customized spray system and the number of models tested. The spray system takes several weeks to install and calibrate. A typical model is tested for one to three days and involved [in] aero-testing (for model surface pressures) and impinge- ment tests for various attitudes and spray droplet diameters. Each of the conditions requires three to five repeats to generate a useful statistical average. A typical model might generate 300 blotter strips.” The 1999 impingement experiments were the third set of tests that had been con- ducted since 1985. Funded by the FAA and Boeing, and with manpower and model support from a variety of manufacturers, the program was scheduled to conclude with the final series of tests in September 2001.28 28 Bidwell to Leary, 23 July 2001; Michael Papadakis, Marlin D. Breer, Neil C. Craig, and Bidwell, “Experimental Water Droplet Impingement Data on Modern Aircraft Surfaces,” AIAA Paper 91-0445 (January 1991). 172PDF Image | History of NASA Icing Research Tunnel
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