Isotta Fraschini Asso 750
| Industry | Aerospace, Aircraft engine manufacturing |
|---|---|
| Founded | 1900s (exact date not specified) |
| Headquarters | Italy |
| Products | Aircraft engines (including Asso 750 series) |
The Isotta Fraschini Asso 750 represented a water-cooled, W 18 configuration aircraft engine developed in Italy during the 1930s. Manufactured by Isotta Fraschini, this powerplant featured a displacement slightly below 48 L (2,900 cu in) and delivered power outputs reaching up to 940 hp (700 kW). It belonged to a series of modular engines, which included the Asso 200 and Asso 500, designed with interchangeable parts to reduce manufacturing expenses.
Technical description
The Asso 750’s W-18 layout consisted of three banks of six cylinders arranged inline, constructed from chrome-manganese steel. Each bank was sealed with a single cast aluminum cylinder head.
Operational history
One variant, capable of producing 940 hp (700 kW), was specifically optimized for the Savoia-Marchetti S.55X aircraft, notably utilized during the transatlantic crossing led by Italo Balbo.
Variants
- Asso 750
- Direct-drive model without supercharging.
- Asso 750 R.
- Enhanced version featuring an altered crankcase and crankshaft, equipped with a reduction gear ratio of 0.658:1. Maximum power output rated at 940 hp (700 kW).
- Asso 750 R.C.
- Asso 750 R.C.35
- The supercharged iteration of the 750 R., designed for an operational ceiling of 3,500 m (11,500 ft).
- Asso 750 M
- Racing adaptation with a displacement of 57.25 L (3,494 cu in), bore of 150 mm (5.9 in), and stroke of 180 mm (7.1 in), intended for the Macchi M.67, later reclassified as the Asso 1000 Ri.
Applications
- CANT Z.501 (initial variants)
- Caproni Ca.111
- Macchi M.C.77
- Savoia-Marchetti S.55
- Savoia-Marchetti S.62
- Savoia-Marchetti S.78
Engines on display
The Italian Air Force Museum exhibits two examples of the Isotta Fraschini Asso 750: one direct-drive version and another Asso 750 R.C.35 featuring both reduction gearing and a supercharger.
Specifications (Asso 750)
See also
References
Further reading
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