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Alfa Romeo 125

Field	Value
name	125, 126, 127, 128, 129 and 131
image	File:Alfa romeo storico aero engine 128RC 1939.jpg
caption	A 820 hp Alfa Romeo 128 R.C.18 from ca1939.
engine_type	Piston aircraft engine
manufacturer	Alfa Romeo
first_run	1930s
number_built	~11,000
major_applications	Savoia-Marchetti SM.79

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

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: Main article: Bristol Jupiter

:The standard 313 kW Jupiter engine built under licence from the Bristol Aeroplane Company.

;Alfa 125 R.C.10: rated at 1000 m

;Alfa 125 R.C.35: 1934 — 485 kW rated at 3500 m

;Alfa 126 R.C.10: 1935 — Civilian version of 126 R.C.34 559 - rated at 1000 m

;Alfa 126 R.C.32: rated at 3200 m

;Alfa 126 R.C.34: 1935 — 507 - rated at 3400 m

;Alfa 127 R.C.50: rated at 5000 m

;Alfa 127 R.C.55: 1937 — 560 kW rated at 5500 m

;Alfa 128 R.C.18: 641 - rated at 1800 m

;Alfa 128 R.C.21: 1938 — 708 kW rated at 2100 m

;Alfa 129 R.C.32: rated at 3200 m

;Alfa 131 R.C.14/50 :1943 — Two speed supercharger, rated at 1400 m in low gear and 5000 m 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)
DAR-10A (prototype) (Alfa126 R.C.34)
Fiat G.12 (Alfa 128 R.C.18)
Junkers Ju 52 (Alfa126 R.C.34)
Macchi M.C.94 (Alfa 126 R.C.10)
Macchi M.C.100 (Alfa 126 R.C.10)
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)
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)

Archivio Storico Alfa Romeo - Volume II |Take-off: 950 hp at 2,300 rpm with 1000 mm Hg boost |Military: 860 hp at 2,300 rpm at 2100 m |Cruising: 660 hp at 1,800 rpm at 2500 m |power/weight=0.782 kW/kg (0.775 hp/lb)

Ignition: 2 x Marelli MF9 magnetos, 2 x spark plugs per cylinder, fed by a shielded harness.

References

Notes Bibliography

Archivio Storico Alfa Romeo - Volume II. Torino, November 1998

References

"STORY OF THE ALFA ROMEO FACTORY AND PLANTS page 12". enzociliberto.it.
"CAPRONI CA.97". alatricolore.it.
"AlfaAEREI Collezione Modelli di Marco Rigoni Settembre 2005". aerei-italiani.net.
"Macchi M.C.100 - 1939". [[Angelfire]].
"The Savoia-Marchetti S.M. 79 Sparviero". xs4all.nl/~fbonne/warbirds.
Wilkinson, Paul H.. (1945). "Aircraft engines of the World 1945". Paul H. Wilkinson.
Archivio Storico Alfa Romeo - Volume II. Torino, November 1998

Info: Wikipedia Source

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