The model was initially developed by Beddoes and Leishman&Beddoes and refined by Leishman and Tyler&Leishman.
The model consists of three distinct sub-systems for describing the dynamic stall physics:
* Attached flow model for the unsteady (linear) airloads (with compressibility effects included) using the compressible indicial response functions;
* Separated flow model for the nonlinear airloads (Kirchhoff-Helmholtz theory);
* Dynamic stall model for the leading edge vortex-induced airloads.
One significant advantage of the model is that it uses relatively few empirical coefficients, with all but four at each Mach number being derived from static airfoil data.