The high-altitude bomber was never created, nor was the passenger R.108S built; on the basis of the project of the latter, the military transport P.108T was developed, produced in a small series, but it did not have a pressurized cabin.
The prototype P.111, which received the military register number M.M.465, in addition to the main research program, was also involved in testing a high-altitude version of the Piaggio P.XI RC 60/72 14-cylinder radial two-row engines, less powerful than the P.XII. In total, before the military and economic collapse of the country, he managed to perform 110 test flights. At the beginning of 1943, the prototype was removed from the Air Force lists and returned to the manufacturing company, which also did not find use for it and in the spring of the same year was scrapped.
- Piaggio P.111 Experimental High-Altitude Plane / Alternative History. Ivan Byakin /
- Piaggio P.111 light high-altitude bomber / Andrey Krumkach /
April 29, 2020.
In 1938, the command of the Italian Royal Air Force (Regia Aeronautica) commissioned Piaggio to develop a high-altitude long-range twin-engined three-seat bomber capable of operating at altitudes of about 10,000 meters. The chief designer of the company, Dr. Ing. Giovanni Casiraghi, decided to start with building a small twin-engine experimental aircraft and work out all the design features of pressurized cabins on it.
The modern high-altitude aircraft system, in addition to the air conditioning system, pumping warm air into the aircraft cabin, has an automatic pressure control system that maintains a constant pressure drop. Judging by the primitive air injection system - a gasoline engine - an air blower and emergency cylinders, there was no question of any SARD on the P.111 aircraft either, but the simplest exhaust valves that maintain a given pressure drop probably should have been ...