Alfa Romeo 125

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:


 * 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 - 597 kW rated at 1000 m


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


 * Alfa 126 R.C.34: 1935 — 507 - 582 kW 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 - 717 kW 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)