PROPID is an inverse design method for HAWTs that is based on the well-known PROP code. The inverse design methodology of PROPID allows the desired performance and aerodynamic characteristics of the rotor to be prescribed from which the blade geometry (chord, twist, and pitch) is determined. PROPID allows for several rotor characterisitcs to be specified and for each of the specified characteritics, a different blade input parameter must be selected for iteration. For example, the rated power of the rotor can be prescribed by iterating on a uniform offset on the blade chord for a given blade length. PROPID has a multipoint design capability meaning that a specified rotor characteristics can be met at a particular operating condition or over a range of operating conditions. The inverse design capability of PROPID is a major improvement over the design by analysis method where the blade geometry is altered until the desired performance is achieved.