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Meeting	ACGS Committee Meeting 119 - Fairborn, OH - March 2017
Agenda Location	4 GENERAL COMMITTEE TECHNICAL SESSION 4.2 Research Institutions, Industry, and University Reports 4.2.1 Research Institutions and Companies 4.2.1.5 Mitchell Aerospace Research
Title	Mitchell Aerospace Research
Presenter	Dave Mitchell
Available Downloads*	presentation
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Abstract	Since its first flight in October 2015, the Sikorsky CH-53K King Stallion helicopter has amassed over 400 flight hours on four aircraft. As would be expected when testing a vehicle in the range of 80,000 lbs, with full-authority fly-by-wire flight controls, some interesting discoveries have been made in flight test. The slides, taken from a NAVAI presentation, document a few of those discoveries. Formal handling qualities testing has not begun in flight yet, but some preliminary comments are available. The aircraft has demonstrated precision control issues in performing the ADS-33E Hover task – issues that were seen at times in ground simulations. Since the aircraft has good pitch and roll short-term response dynamics (Bandwidth), the issue probably comes from other sources. The unique-trim sidestick controller for the CH-53K uses a dynamic breakout force: breakout is a function of the velocity of stick travel. For high-frequency, small-amplitude inputs required for precision hover, it is possible this dynamic breakout a factor. External loads flight testing has brought several issues to light. At some flight conditions, load swinging causes small-amplitude pilot-induced oscillations (PIO) as the pilot couples with the flight control system. A vertical bounce mode has also been identified; since the focus for external loads is usually the modes generated by swinging, the significance of the bounce mode was not appreciated until flight testing began.