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.