This paper presents recent research on numerical methods for whirl and stall flutter using computational
fluid dynamics. The method involves coupling of the HMB3 CFD solver of the University of
Glasgow and a NASTRAN derived structural model. Based upon a literature survey, a significant amount
of research has been conducted on the numerical investigation of tiltrotors, with a focus on the XV-15
and V-22 aircraft. Within this paper, the coupling procedure is presented along with a steady CFD computation
to highlight the accuracy of the high-fidelity method. In addition to this, a simple method is used
to investigate the whirl flutter boundary of a standard propeller and the XV-15 blade
