The Papero was designed at the Centro Volo a Vela (CVV), or Experimental Soaring Centre, of the Royal Polytechnic of Milan by Gildo Preti, the fourth and last in a series of gull winged, single seat, competition gliders.
Each wing was double straight tapered, with semi-elliptical tips and built around a single spar with a ply covered torsion D-box ahead of it and fabric behind.
The undercarriage was improved by lightening the skid and including a fixed, semi-recessed monowheel.
Both models had a horizontal tail mounted on a shallow pedestal slightly above the upper fuselage and forward of the rudder hinge, though the elevators of the Papero were reshaped and carried a small trim tab.
It had a slightly better glide angle than the Pellicano and competitive with the best sailplanes of its time, even with those of greater span.