Statistical analysis of hover performance test data of the Bell YAH-1R helicopter when equipped with both the standard and improved main rotor blades

Includes bibliographical references (pages 37-38)The United States Army Aviation Engineering Flight Activity conducted an airworthiness and flight characteristic evaluation of the improved main rotor blade manufactured by Kaman Aerospace Corporation which was installed on the YAH-lR helicopter. Both the standard Bell 8540 and Kaman K747 rotor blades were evaluated for hover performance. The results of the B540 blades were used as a baseline for comparison to the K747 results. Both sets of hover performance data were analyzed using techniques based upon established statistical and probability theories. The results of these analysis and hypothesis testing were the rejection of the contractors claim of a 8.7% improvement in hover performance