DRA - Dudek Reflex Airfoil -applied in PPG wings fully autostabilised aerofoil, based on long years of research and experience. Dudek designers managed to get rid of typical flaws associated with these aerofoils. Simply put, it is an aerofoil which – in case of decreased angle of attack – automatically tends to have it increased again. In other words, it always stays in neutral position regarding its load. On drawings it's an aerofoil that has its tail turned upwards.

Application of flexible synthetic rods was tried for the first time in the Hadron. Then, positive experience led Dudek to use this technology in many other designs of various classes. The leading edge is closed to the airflow, and its precise shape is kept with laminated cloth reinforcements, incorporating synthetic rods. The rods make the leading edge stiffer and smoother, bringing improvements in many areas - from easier inflation, through stiffening the canopy in flight to improved general airflow. Another advantage is possibility of using three rows of suspension lines instead of four, thus decreasing parasitic drag and distinctly improving overall performance.