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Piaggio P.X

January 01, 1970

Not to be confused with Piaggio Vespa PX Stella or Stella PX.

The Piaggio P.X, or Piaggio Stella P.X, was an Italian nine-cylinder radial aircraft engine produced by Rinaldo Piaggio S.p.A. Based on experience license-producing Gnome et Rhône designs, the engine was used to power a number of aircraft during World War II, including the IMAM Ro.37bis and IMAM Ro.43, used extensively by the Regia Aeronautica and Regia Marina respectively.

Stella P.X
A close cowled P.X fitted to an IMAM Ro.43 in 1940
Type Air cooled radial
National origin Italy
Manufacturer Piaggio
Designer Renzo Spolti
Major applications IMAM Ro.43
Developed from Piaggio Stella P.IX

Design and development edit

Piaggio acquired a license from Gnome et Rhône in 1925 for their engines derived from the Bristol Jupiter.[1] The designs proved successful and, using this experience, the company designed a range of related radial engines named "Stella", meaning star.[2] The design was led by the engineer Renzo Spolti.[3] The engines were initially known by their number of cylinders, so the first nine-cylinder model in the range was the P.IX of 1933. However, a progressive number in Roman numerals was used as the design progressed, so the P.IX was followed by the P.X.[2]

The Stella P.X was a nine cylinder version of the P.VII.[4] It retained the same bore and stroke as the original Gnome-Rhône designs, 146 mm (5.7 in) and 165 mm (6.5 in) respectively, but was substantially more powerful than the comparable 9K.[3] The engine had a two piece aluminium alloy crankcase, steel barrels for the cylinders and aluminium alloy heads. A Piaggio T2-80 updraught carburettor was fitted.[5] The basic version, the R., had reduction gear, while the R.C. was also equipped with a compressor.[2]

The engine powered the Italian aircraft that served during World War II.[6] The IMAM Ro.43 was particularly noteworthy for its performance in the Battles of Cape Spartivento and Cape Matapan.[7]

Variants edit

P.X R.
Normally aspirated and geared.
P.X R.C.15
Supercharged and geared, rated at 1,500 m (4,900 ft).
P.X R.C.35
Supercharged and geared, rated at 3,500 m (11,500 ft).

Applications edit

Specifications (R.C.35) edit

Data from Wilkinson, 1945 [5]

General characteristics

  • 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: 1,408 mm (55.4 in)
  • Diameter: 1,280 mm (50 in)
  • Dry weight: 430 kg (950 lb)

Components

Performance

  • Power output:
    • Take-off: 640 hp (477 kW) at 2,250 rpm
    • Cruise: 450 hp (336 kW) at 1,800 rpm at 3,500 m (11,500 ft)
  • Compression ratio: 6.0:1
  • Specific fuel consumption: 300 g/kWh (0.48 lb/(hp·h))
  • Oil consumption: 8 g/kWh (0.018 lb/(hp·h))

See also edit

Related development

Comparable engines

Related lists

References edit

Citations edit

  1. ^ Gunston 1986, p. 125.
  2. ^ a b c "PXI RC40 engine". Museo Piaggio. from the original on 26 August 2017. Retrieved 27 March 2020.
  3. ^ a b Angle 1939, p. 584.
  4. ^ Wilkinson 1945, p. 60.
  5. ^ a b Wilkinson 1945, p. 302.
  6. ^ Green 1967, p. 111.
  7. ^ Sadkovich 1994, p. 98.

Bibliography edit

  • Angle, Glenn Dale (1939). Aerosphere. New York.{{cite book}}: CS1 maint: location missing publisher (link)
  • Green, William (1967). War Planes of the Second World War: Volume Six – Floatplanes. London: Macdonald. ISBN 978-3-56014-509-1.
  • Gunston, Bill (1978). The Illustrated Encyclopedia of Combat Aircraft of World War II. London: Salamander Books. ISBN 978-0-86101-017-2.
  • Gunston, Bill (1986). World Encyclopedia of Aero Engines. London: Guild Publishing. ISBN 978-0-85059-717-2.
  • Sadkovich, James (1994). The Italian Navy in World War II. Westport: Greenwood Press. ISBN 978-0-31328-797-8.
  • Thompson, Jonathon W. (1963). Italian Civil and Military Aircraft 1930–1945. USA: Aero Publishers Inc. ISBN 978-0-81686-500-0.
  • Wilkinson, Paul Howard (1945). Aircraft Engines of the World. New York: Paul H. Wilkinson. Retrieved 27 March 2020.

January 01, 1970
piaggio, confused, with, piaggio, vespa, stella, stella, piaggio, stella, italian, nine, cylinder, radial, aircraft, engine, produced, rinaldo, piaggio, based, experience, license, producing, gnome, rhône, designs, engine, used, power, number, aircraft, during. Not to be confused with Piaggio Vespa PX Stella or Stella PX The Piaggio P X or Piaggio Stella P X was an Italian nine cylinder radial aircraft engine produced by Rinaldo Piaggio S p A Based on experience license producing Gnome et Rhone designs the engine was used to power a number of aircraft during World War II including the IMAM Ro 37bis and IMAM Ro 43 used extensively by the Regia Aeronautica and Regia Marina respectively Stella P X A close cowled P X fitted to an IMAM Ro 43 in 1940 Type Air cooled radial National origin Italy Manufacturer Piaggio Designer Renzo Spolti Major applications IMAM Ro 43 Developed from Piaggio Stella P IX Contents 1 Design and development 2 Variants 3 Applications 4 Specifications R C 35 4 1 General characteristics 4 2 Components 4 3 Performance 5 See also 6 References 6 1 Citations 6 2 BibliographyDesign and development editPiaggio acquired a license from Gnome et Rhone in 1925 for their engines derived from the Bristol Jupiter 1 The designs proved successful and using this experience the company designed a range of related radial engines named Stella meaning star 2 The design was led by the engineer Renzo Spolti 3 The engines were initially known by their number of cylinders so the first nine cylinder model in the range was the P IX of 1933 However a progressive number in Roman numerals was used as the design progressed so the P IX was followed by the P X 2 The Stella P X was a nine cylinder version of the P VII 4 It retained the same bore and stroke as the original Gnome Rhone designs 146 mm 5 7 in and 165 mm 6 5 in respectively but was substantially more powerful than the comparable 9K 3 The engine had a two piece aluminium alloy crankcase steel barrels for the cylinders and aluminium alloy heads A Piaggio T2 80 updraught carburettor was fitted 5 The basic version the R had reduction gear while the R C was also equipped with a compressor 2 The engine powered the Italian aircraft that served during World War II 6 The IMAM Ro 43 was particularly noteworthy for its performance in the Battles of Cape Spartivento and Cape Matapan 7 Variants editP X R Normally aspirated and geared P X R C 15 Supercharged and geared rated at 1 500 m 4 900 ft P X R C 35 Supercharged and geared rated at 3 500 m 11 500 ft Applications editIMAM Ro 37bis IMAM Ro 43 IMAM Ro 44 Savoia Marchetti S 73 Savoia Marchetti S 74 Savoia Marchetti SM 81Specifications R C 35 editData from Wilkinson 1945 5 General characteristics 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 1 408 mm 55 4 in Diameter 1 280 mm 50 in Dry weight 430 kg 950 lb Components Valvetrain 2 x overhead valves per cylinder operated by rockers and pushrods Supercharger Centrifugal compressor Fuel type 87 Octane petrol Cooling system Air cooled Performance Power output Take off 640 hp 477 kW at 2 250 rpm Cruise 450 hp 336 kW at 1 800 rpm at 3 500 m 11 500 ft Compression ratio 6 0 1 Specific fuel consumption 300 g kWh 0 48 lb hp h Oil consumption 8 g kWh 0 018 lb hp h See also editRelated development Piaggio Stella P IX Comparable engines Gnome Rhone 9K Nakajima Kotobuki Pratt amp Whitney R 1340 Wasp Related lists List of aircraft enginesReferences editCitations edit Gunston 1986 p 125 a b c PXI RC40 engine Museo Piaggio Archived from the original on 26 August 2017 Retrieved 27 March 2020 a b Angle 1939 p 584 Wilkinson 1945 p 60 a b Wilkinson 1945 p 302 Green 1967 p 111 Sadkovich 1994 p 98 Bibliography edit Angle Glenn Dale 1939 Aerosphere New York a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link Green William 1967 War Planes of the Second World War Volume Six Floatplanes London Macdonald ISBN 978 3 56014 509 1 Gunston Bill 1978 The Illustrated Encyclopedia of Combat Aircraft of World War II London Salamander Books ISBN 978 0 86101 017 2 Gunston Bill 1986 World Encyclopedia of Aero Engines London Guild Publishing ISBN 978 0 85059 717 2 Sadkovich James 1994 The Italian Navy in World War II Westport Greenwood Press ISBN 978 0 31328 797 8 Thompson Jonathon W 1963 Italian Civil and Military Aircraft 1930 1945 USA Aero Publishers Inc ISBN 978 0 81686 500 0 Wilkinson Paul Howard 1945 Aircraft Engines of the World New York Paul H Wilkinson Retrieved 27 March 2020 Retrieved from https en wikipedia org w index php title Piaggio P X amp oldid 1219454863, wikipedia, wiki, book, books, library,

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