avia.wikisort.org - Engine
Alfa Romeo built/designed a range of aircraft engines based on the Bristol Jupiter and Bristol Pegasus designs, designated Alfa 125, Alfa 126, Alfa 127, Alfa 128, Alfa 129 and Alfa 131. All these essentially similar engines were mainly fitted to Italian bombers in World War II, Alfa Romeo building around 11,000 units between 1934 and 1944 [1]
| 125, 126, 127, 128, 129 and 131 | |
|---|---|
 | |
| A 610 kW (820 hp) Alfa Romeo 128 R.C.18 from ca1939. | |
| Type | Piston aircraft engine |
| Manufacturer | Alfa Romeo |
| First run | 1930s |
| Major applications | Savoia-Marchetti SM.79 |
| Number built | ~11,000 |
Design and development
Alfa Romeo adapted the Jupiter / Pegasus (which are very closely related) to metric measurements, local materials and indigenous equipment.
Variants
(The Italian engine designation system includes a suffix indicating major components or attributes. The most common were R for Riduttore - reduction gear and C for Compressore - compressor/supercharger, followed by a number indicating the rated altitude in hundreds of metres, two speed superchargers were indicated by a double figure such as 10/34).
- Alfa Romeo Jupiter
- The standard 313 kW (420 hp) Jupiter engine built under licence from the Bristol Aeroplane Company.
- Alfa 125 R.C.10
- rated at 1,000 m (3,300 ft)
- Alfa 125 R.C.35
- 1934 485 kW (650 hp) rated at 3,500 m (11,500 ft)
- Alfa 126 R.C.10
- 1935 Civilian version of 126 R.C.34 559–597 kW (750–801 hp) rated at 1,000 m (3,300 ft)
- Alfa 126 R.C.32
- rated at 3,200 m (10,500 ft)
- Alfa 126 R.C.34
- 1935 507–582 kW (680–780 hp) rated at 3,400 m (11,200 ft)
- Alfa 127 R.C.50
- rated at 5,000 m (16,000 ft)
- Alfa 127 R.C.55
- 1937 560 kW (750 hp) rated at 5,500 m (18,000 ft)
- Alfa 128 R.C.18
- 641–717 kW (860–962 hp) rated at 1,800 m (5,900 ft)
- Alfa 128 R.C.21
- 1938 708 kW (949 hp) rated at 2,100 m (6,900 ft)
- Alfa 129 R.C.32
- rated at 3,200 m (10,500 ft)
- Alfa 131 R.C.14/50
- 1943 Two speed supercharger, rated at 1,400 m (4,600 ft) in low gear and 5,000 m (16,000 ft) in high gear.
Applications
- Breda Ba.64 (Alfa125 R.C.35)
- CANT Z.506A Airone (Alfa 126 R.C.10)
- CANT Z.506B Airone (Alfa 126 R.C.34 / Alfa 127 R.C.50 / Alfa 127 R.C.55)
- CANT Z.506C Airone (Alfa 126 R.C.10)
- Caproni Bergamaschi AP.1 (Alfa126 R.C.34)
- Caproni Ca.97 (AlfaJupiter)[2]
- DAR-10A (prototype) (Alfa126 R.C.34)
- Fiat G.12 (Alfa 128 R.C.18)
- Junkers Ju 52 (Alfa126 R.C.34)[3]
- Macchi M.C.94 (Alfa 126 R.C.10)
- Macchi M.C.100 (Alfa 126 R.C.10)[4]
- Savoia-Marchetti S.73 (Alfa 126 R.C.10 / Alfa 126 R.C.34)
- Savoia-Marchetti S.74 (Alfa126 R.C.34)
- Savoia-Marchetti SM.75 Marsupiale (Alfa 128 R.C.18 / Alfa 128 R.C.21)
- Savoia-Marchetti S.77 (Alfa 126 R.C.10)
- Savoia-Marchetti S.M.79 Sparviero (Alfa 128 R.C.18 / Alfa 125 R.C.35 / Alfa126 R.C.34)[5]
- Savoia-Marchetti S.M.79-II Sparviero (Alfa 126 R.C.34)
- Savoia-Marchetti S.M.79B Sparviero (Alfa 128 R.C.18)
- Savoia-Marchetti S.M.81 Pipistrello (Alfa 125 R.C.35 / Alfa 126 R.C.34)
- Savoia-Marchetti S.M.82 Canguru (Alfa 128 R.C.18 / Alfa 128 R.C.21 / Alfa 129 R.C.32)
- Savoia-Marchetti S.M.83 (Alfa126 R.C.34)
- Savoia-Marchetti S.M.84 (Alfa 128 R.C.21)
- Savoia-Marchetti S.M.95 (Alfa 128 R.C.18 / Alfa 131 R.C.14/50)
Specifications (Alfa 128 R.C.21)
Data from Aircraft Engines of the World 1945[6] Archivio Storico Alfa Romeo - Volume II[7]
General characteristics
- Type: 9-cylinder air-cooled radial engine
- Bore: 146 mm (5.75 in)
- Stroke: 190 mm (7.48 in)
- Displacement: 28.6 L (1,745.28 cu in)
- Length: 1,329 mm (52.3 in)
- Diameter: 1,400 mm (55.1 in)
- Dry weight: 516 kg (1,138 lb)
- Frontal Area: 1.54 m2 (16.6 sq ft)
Components
- Valvetrain: 2 x inlet valves and 2 x exhaust valves per cylinder operated by pushrods and rockers
- Supercharger: Gear-driven 1-speed, 8.8:1 ratio, supercharger
- Fuel system: 1 x Mona-Hobson AVT85MC updraught carburettor with automatic boost control
- Fuel type: 87 octane
- Oil system: 551.6 kPa (80 psi), dry sump.
- Cooling system: Air-cooled
- Reduction gear: Epicyclic bevel reduction gear, 0.65:1 ratio.
- Starter: Garelli compressed air starter
- Ignition: 2 x Marelli MF9 magnetos, 2 x spark plugs per cylinder, fed by a shielded harness.
Performance
- Power output:
- Take-off: 708 kW (950 hp) at 2,300 rpm with 1,000 mm (39.37 in) Hg boost
- Military: 641 kW (860 hp) at 2,300 rpm at 2,100 m (6,900 ft)
- Cruising: 492 kW (660 hp) at 1,800 rpm at 2,500 m (8,200 ft)
- Specific power: 24.57 kW/L (0.54 hp/cu in)
- Compression ratio: 7:1
- Specific fuel consumption: 0.31 kg/kW/hr (0.51 lb/hp/hr) (take-off)
- Oil consumption: 0.0078 kg/kW/hr (0.013 lb/hp/hr)
- Power-to-weight ratio: 0.782 kW/kg (0.775 hp/lb)
See also
Comparable engines
Related lists
References
Notes
- "STORY OF THE ALFA ROMEO FACTORY AND PLANTS page 12" (PDF). enzociliberto.it. Archived from the original (PDF) on 2007-09-29. Retrieved 2007-08-25.
- "CAPRONI CA.97". alatricolore.it. Retrieved 2007-09-20.
- "AlfaAEREI Collezione Modelli di Marco Rigoni Settembre 2005" (PDF). aerei-italiani.net. Archived from the original (PDF) on 5 June 2007. Retrieved 2007-04-25.
- "Macchi M.C.100 - 1939". angelfire.com. Archived from the original on 31 October 2007. Retrieved 2007-09-20.
- "The Savoia-Marchetti S.M. 79 Sparviero". xs4all.nl/~fbonne/warbirds. Archived from the original on 17 July 2007. Retrieved 2007-08-27.
- Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 288–289.
- Archivio Storico Alfa Romeo - Volume II. Torino, November 1998
Bibliography
- Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 288–289.
- Archivio Storico Alfa Romeo - Volume II. Torino, November 1998
На других языках
- [en] Alfa Romeo 125
[es] Alfa Romeo 125
La firma Alfa Romeo construyó/diseñó una gama de motores de avión basados en los diseños de los motores radiales británicos Bristol Jupiter y Bristol Pegasus , designados Alfa 125, Alfa 126, Alfa 127, Alfa 128, Alfa 129 y Alfa 131. Todos estos motores esencialmente similares se instalaron principalmente en bombarderos italianos utilizados durante la Segunda Guerra Mundial. Alfa Romeo construyó alrededor de 11000 unidades entre 1934 y 1944.[1]Alfa Romeo adaptó el diseño Júpiter/Pegasus (que están muy relacionados) al sistema métrico con materiales locales y equipos autóctonos.[it] Alfa Romeo 125
L'Alfa Romeo 125 fu un motore aeronautico radiale 9 cilindri a singola stella e raffreddato ad aria sviluppato dall'azienda italiana Alfa Romeo Milano negli anni trenta.[ru] Alfa Romeo 125
Alfa Romeo 125 — итальянский поршневой 9-цилиндровый авиадвигатель воздушного охлаждения, разработанный в начале 1930-х годов компанией Alfa Romeo на основе конструкций британских Bristol Jupiter и Bristol Pegasus; выпускался в модификациях AlfaJupiter, Alfa 125, Alfa 126, Alfa 127, Alfa 128, Alfa 129 и Alfa 131. Между 1934 и 1944 годами было произведено около 11000 этих двигателей, преимущественно использовавшихся на трёхмоторных бомбардировщиках итальянских королевских ВВС [1].Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.
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