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History of NASA Icing Research Tunnel

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History of NASA Icing Research Tunnel ( history-nasa-icing-research-tunnel )

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Although the three study contracts formed the foundation of our icing program, it evolved further through frequent NASA-industry workshops and peer reviews. Industry or other government agencies often proposed programs to address urgent technology or safety needs. With such a diverse and extensive list of objectives, it was clear that NASA could not singlehandedly support this large effort in either funding or staff. So we did it by coordinating personnel, test equipment, and experimental facilities within the U.S. government, industry, universities, and, on occasion, within other countries. We wrote interagency agreements with the FAA, Army, Navy, and Air Force. We also forged inter- national agreements in icing with Canada, France, and the United Kingdom. Some of these interagency agreements were accompanied by fund transfers to NASA, and these were an important part of our total funding picture. Another important source of funds was the SBIR (small business innovative research) program at LeRC, through which nearly all of our advanced ice-protection concepts were funded. A good example of coordination that required both national and international resources was the program to evaluate pneumatic boots for helicopter rotors. The BFGoodrich Company supplied pneumatic boots and system hardware for IRT model tests and helicopter flight tests, and participated in all tests. The U.S. Army supplied a UH-1H helicopter, its pilots, and its support crews for all flight tests. The Bell Helicopter Company supplied experienced test engineers to assess any safety hazards and to follow all tests. Canada supplied its Hover Icing Spray Rig. The U.S. Army supplied their in- flight icing simulator Helicopter Icing Spray System (HISS), a custom CH-47 heavy-lift helicopter fitted with water tanks and spray bars, and all the support aircraft and crews. NASA helped calibrate the HISS by flying its heavily instrumented Twin Otter in the super-cooled cloud behind the HISS. The program began with NASA testing several boot configurations in the IRT to determine the best tube arrangement for effective ice removal and minimal drag increase. Then Army personnel flew the UH-1H in clear air to evaluate the effects of the inflated boots on helicopter handling qualities. Next they flew hover tests in Canada’s Hover Icing Spray Rig. Then they flew behind the HISS at Edwards Air Force Base in California. Again they flew in natural icing in Minnesota. Finally, the Army tested the boots on a UH-1H in its special rain and sand erosion facil- ity at Fort Rucker, Alabama. By coordinating and sharing our resources, we became a close-knit icing community in which good communications flourished. Industry and government agen- cies got test results promptly, because they participated in the tests. Master’s and doctoral students worked closely with industry to ensure their NASA grant research was relevant and that our new NASA computer codes gained wide distribution. With our “new” program came the heavy development of computer codes. These included droplet trajectory codes, ice-accretion modeling codes, and ice- protection system design codes. These highly useful codes have been distributed widely Foreword vii

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