A Successful Comprehensive Rotor Dynamics Correlation for a Sikorsky Full-Scale Bearingless Main Rotor

Results from a 5-year correlation study for a Sikorsky 5-bladed bearingless main rotor design is presented. The measured data is from a full-scale wind tunnel test of a proof-of-concept BMR sized for the Sikorsky S-76 helicopter. Some flight test data from the Comanche flight test is also included. The analyses used include the Sikorsky KTRAN and RDYNE codes, and the Sikorsky modified version of the UMARC program. Good correlations have been obtained for blade frequencies, stability, bending loads, vibratory hub loads and pushrod loads.