Conventional prop working at design speed. Excellent alignment of the angle of the resulting airspeed and blade pitch, along the whole working radius.Axial speed – deviates from design value. Discrepancies appear between the direction of the resulting airspeed and blade pitch, along the radius. Propeller efficiency drops.
Simultaneous Stall and Windmilling on The Same Blade – Happens Frequently, Undiscovered
Stallfree propellers have sophisticated blades. Both stall and windmilling regimes can be avoided – along the whole working radius, in a very wide range of axial speed.
