Savoia-Marchetti SM.76
| Savoia-Marchetti SM.76 | |
|---|---|
|
|
| Type: | Passenger plane |
| Design country: | |
| Manufacturer: | |
| First flight: |
Late 1940 |
| Number of pieces: |
<1 |
The Savoia-Marchetti SM. 76 was an Italian passenger aircraft . It was a further developed version of the Savoia-Marchetti SM.75 with better performance characteristics and greater range. SIAI ran the SM.76 as the SM.75GA until the aircraft was introduced by LATI in late 1940.
history
The SM.76 emerged from the SM.75 as part of a program for long-distance passenger transport and was carried out in 1939 under the name SM.75GA (Grande Autonomia), where GA stood for large travel range. Only when it was used by the LATI airline at the end of 1940 was this aircraft type SM.75GA given the independent designation SM.76. The SM.76 was based on the basic construction of the SM.75, the dimensions differed only slightly from those of the SM.75. Improved wings with a larger tank to increase the range as well as three more powerful engines were the cornerstone for the SM.76. The improved engines should provide more power and speed, the enlarged tanks in the wings for more range. The prototype of the SM.76 was still equipped with Pratt & Whitney Twin Wasp engines, which, however, were no longer supplied to Italy by the USA because of the Second World War . SIAI converted the machines to the Piaggio P.XI RC40 engine. Unfortunately, the Piaggio P.XI-RC40 engine turned out to be a real fuel guzzler, so that although the speed could be increased, the range was only slightly increased (by 1300 km). The SM.76 thus fell far short of expectations. Another version of the SM.75 RT (Roma Tokyo) was then discarded. With the newly founded Linee Aeree Transcontinentali Italiane (LATI), the SM.76 was used in air traffic in Natal and Rio de Janeiro in Brazil . The Socialist Republic of Italy flew the SM.76 until 1949 when this type was retired. The exact number of items produced could not be determined.
construction
The SM.76 was based on the SM.75. SIAI improved the wing mounts to accommodate stronger and heavier engines. The flight performance was increased with new engines. To increase the range, more and larger tanks were built into the wings. In order to achieve improved stability, the construction of the fuselage and the wings have been revised, thereby increasing the length and wingspan of the SM.75GA. In the prototype of the SM.75GA, the air-cooled 9-cylinder radial engines Alfa Romeo 126RC34, each with 750 hp, were replaced by more powerful Pratt & Whitney Twin Wasp engines, which were replaced by air-cooled 9-cylinder radial engines during the Second World War due to a lack of spare parts Piaggio P.XI RC40 with 990 hp each from Italian production were replaced. For the conception and history of development, see also Savoia-Marchetti SM.75 .
Technical specifications
| Parameter | Data |
|---|---|
| crew | 6 men + 18 people |
| span | 29.7 m |
| length | 22.3 m |
| height | 5.1 m |
| Wing area | 118.5 m² |
| Empty mass | 9,500 kg |
| Takeoff mass | 14,500 kg |
| drive | 3 × air-cooled 9-cylinder radial engine Piaggio P.XI RC40 with 990 PS (728 kW) each |
| Cruising speed | 325 km / h |
| Top speed | 400 km / h at an altitude of 3,000 m |
| Service ceiling | 7,000 m |
| Range | 3,000 km |
| Armament: | 1 × 7.7 mm Breda-SAFAT machine gun in a rotating turret (military version only) |
Users
literature
- AEREI: Italiani-Scheda Tecnica. Savoia-Marchetti SM75.
- Avions. Giancarlo Garello: La Militarisierung de 19th Civile Durant la Seconde Guerre Italienne Mondiale.
- F. D'Amico, G. Valentini: Regia Aeronautica.
- Donald d. Complete encyclopedia of the world Planes: Planes and helicopters of the 20th century.
- see also Savoia-Marchetti SM.75
Web links
- Documentation of the SM.76 with pictures (Jap.)
- Documentation of the SM.76 in Russian with pictures (Russian)
Individual evidence
- ^ History of the SM.76. (soot.)
- ↑ a b AEREI Italiani-Scheda Tecnica. Savoia-Marchetti SM75
- ↑ a b c d History of SM.76. (jap.)