Piaggio Stella P.IX
The Piaggio P.IX, or Piaggio Stella P.IX, was an Italian nine-cylinder radial aircraft engine produced by Rinaldo Piaggio S.p.A.. Based on the Gnome-Rhône 9K, the engine was used to power the main reconnaissance aircraft in the Regia Aeronautica, and a number of other aircraft developed in Italy, during the Second Italo-Ethiopian War, Spanish Civil War and Second World War.
|P.IX mounted on the IMAM Ro.37 at the Italian Air Force Museum, Vigna di Valle|
|Type||Air cooled radial|
|Designed by||Renzo Spolti|
|Major applications||IMAM Ro.37|
|Developed from||Gnome-Rhône 9K|
|Developed into||Piaggio P.X|
Piaggio acquired a license from Gnome et Rhône in 1925 for their engines derived from the Bristol Jupiter and, in 1933, brought out a developed version, created under the direction of engineer Renzo Spolti. The engine had nine cylinders and was therefore named P.IX. It was one of a range of Piaggio radial engines named "Stella", all based on the same radial design.
- P.IX R.
- Normally aspirated and geared.
- P.IX R.C.
- Supercharged and geared.
- P.IX R.C.10
- Supercharged and geared, rated at 1,000 m (3,300 ft).
- P.IX R.C.40
- Supercharged and geared, rated at 4,000 m (13,000 ft).
Data from S.A. Piaggio e.C. (1939). Instruzione per l’uso del motore P IX R C 40. Rome: Ministero dell’Aeronautica.
- Type: 9-cylinder, single row, air cooled radial engine
- Bore: 146 mm (5.7 in)
- Stroke: 165 mm (6.5 in)
- Displacement: 24.9 l (1,519 in3)
- Length: 1,050 mm (41 in)
- Diameter: 1,408 mm (55.4 in)
- Dry weight: 430 kg (950 lb)
- Valvetrain: 2 x overhead valves per cylinder operated by rockers and pushrods
- Supercharger: Centrifugal compressor
- Fuel type: 87 Octane petrol
- Cooling system: Air-cooled
- Power output:
- Take-off: 610 hp (455 kW) at 2100 rpm
- Cruise: 600 hp (447 kW) at 2100 rpm at 4,000 m (13,123 ft)
- Compression ratio: 6.0:1
- Angle, Glenn Dale (1939). Aerosphere. New York: Aircraft Publications. p. 584.
- Gunston, Bill (1986). World Encyclopedia of Aero Engines. London: Guild Publishing. p. 125.