The Bastianelli P.R.B was a 1920s Italian flying-boat, the first product of Societá Industriale l'Aviazone.

[1] The Bastianelli P.R.B (named after the three Italians that formed the company Giovanni Pegga, Giuseppe Rossi and Filippo Bastianelli) was a large span two-bay biplane flying boat.

[1] It was powered by four 300 hp (224 kW) Fiat A.12bis inline piston engines mounted in tandem pairs on the lower wing.

[1] Built in Rome it was transported to Lido di Ostia for completion and testing and it first flew on 11 May 1921 piloted by Rossi.

[1] Data from [1]Illustrated Encyclopedia of AircraftGeneral characteristics Performance