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“We Freeze to Please” Figure 6–12. Metal template melting ice accretion for profile check, 1990. (NASA C-1990-13574) The OH-58 tests proceeded without incident. As Bond had hoped, they paved the way for the PFM experiments. Lessons had been learned about coordination procedures for model and tunnel, and the best methods for observing and documenting rotor ice accretion and shedding. Also, the tests had led to establishing safety and emergency procedures. PFM testing took place over a ten-week period in the fall of 1989. The Sikorsky- built Blackhawk model was a far more sophisticated creation than the OH-58 rig. It featured a six-component internal force balance from which measurements of main rotor performance could be made. The four-bladed main rotor consisted of generic NACA 0012 airfoils, 6 feet in diameter. (A true one-sixth-scale model of the Blackhawk main rotor would have been 9 feet in diameter, but the IRT test section could not accommo- date a blade of this length.) With the PFM, a pilot sat in the control room of the IRT and “flew” the model with a joystick during icing tests. Bond collected performance data first with a clean model to establish a baseline, and then he gathered information under icing conditions. 122PDF Image | History of NASA Icing Research Tunnel
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