Investigation of Vertical Axis Handling Qualities for Helicopter Hover and Noe Flight,
NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO) FLIGHT RESEARCH LAB
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The preliminary results of two in-flight simulation programs on vertical axis rotorcraft handling qualities are presented. The parameters investigated in these studies were heave damping, Zw thrust to weight ratio, TW, and a number of dynamic engine governorrotor system models. Flight tasks included hover, hover manoeuvering and nap of the earth NOE flight. Evaluation of 9 heave damping, thrust to weight ratio configurations provides that basis to suggest Level 1 Zw and TW boundary values of -0.20 sec. and 1.08 respectively. These boundaries are compared with other relevant work on the topic. The engine governorrotor system evaluation results tend to disagree with handling qualities predictions based on a vertical velocity shaping parameter however further investigation is required. NATO.
- Flight Control and Instrumentation