GenHel S-76C Model Correlation using Flight Test Identified Models

A flight test program using a Sikorsky S-76C++™ test aircraft was conducted in October 2006 at the Sikorsky Flight Test Development Center in West Palm Beach, FL. This flight testing was performed in support of the S-76D™ program. The S-76D incorporates a new automatic flight control system (AFCS). In order to support design of the AFCS, one of the major goals for this flight test program was to collect data for model identification. The identified models were then to be used both directly for S-76D AFCS design and as tools for assisting with correlation of the GenHel S-76C model. The changes made to the GenHel S-76C model were then used to update the GenHel S-76D model. In this paper two of the S-76C++ identified models are examined along with the updates made to the GenHel S-76C model.