Testing unmanned aerial vehicle airfoils

The output of the MHFS is the most sensitive and definitive indicator of the state of the boundary layer and the locations of the various critical aerodynamic flow points and, therefore, serves conveniently as a primary diagnostic tool for boundary-layer flow directed aerodynamic properties for both static and unsteady low-Re airfoils. Caution, however, must be executed to evaluate and minimize the effects of "long" cable length or capacitance deriving from the distant sensor location to the data acquisition system, as frequently encountered in transonic wind tunnel tests. This caution also applies to the lead resistance, maximum sensitivity, change in sensor resistance with temperature and the degradation of the sensor outputs.