Analytical Calculation of Helicopter Main Rotor Blade Flight Loads in Hover and Forward Flight

Report No. ARL-TR-3180
Authors: Ki C. Kim
Date/Pages: April 2004; 24 pages
Abstract: An aeroelastic analysis was conducted to calculate flight loads on the OH-58D Kiowa Warrior main rotor blade at hover and forward flight conditions. Centrifugal force and flap and chord bending moments were calculated with the University of Maryland Advanced Rotorcraft Code (UMARC) comprehensive helicopter aeroelastic analysis code. The calculated loads were correlated with available flight data for the Bell model 406LM helicopter (model 406T rotor blade) to validate the analytical model. After the correlation study, UMARC was used to calculate blade loads at the ballistic test section radial stations. These baseline loads were represented during the ballistic tests. This report presents the methods and results of the aeroelastic analysis.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2004