The SIAI S.8 was an Italian 1910s two-seat reconnaissance flying boat.

Role Reconnaissance flying boat
Manufacturer SIAI
Designer Raffaele Conflenti
First flight 1917
Primary user Regia Marina
Number built 214

Design and development

The Societa Idrovolanti Alta Italia (SIAI) was formed in 1915 initially to build French flying boats under license. The company employed Raffaele Conflenti as chief designer and his first design was the SIAI S.8, a two-seat equal-span biplane flying boat, first flown in 1917. The Royal Italian Navy ordered 800 S.8s, to be built by SIAI and subcontractors. With the end of the war, production was stopped when 172 aircraft had been delivered. Early aircraft were powered by an Isotta Fraschini V4B engine, later aircraft had the more powerful 220 hp (164 kW) Hispano-Suiza 44.

Operational history

The aircraft equipped five squadrons of the Regia Marina. By 1920 only 63 aircraft survived, mostly in storage.


 Kingdom of Italy

Specifications (S.8)

Data from

General characteristics

  • Crew: 2
  • Length: 9.84 m (32 ft 3 in)
  • Wingspan: 123.77 m (406 ft 1 in)
  • Height: 3.3 m (10 ft 10 in)
  • Wing area: 46 m2 (500 sq ft)
  • Empty weight: 900 kg (1,984 lb)
  • Max takeoff weight: 1,375 kg (3,031 lb)
  • Powerplant: 1 × Isotta-Fraschini V.4B 6-cylinder water-cooled in-line piston engine, 134 kW (180 hp)
  • Propellers: 2-bladed fixed-pitch pusher propeller


  • Maximum speed: 144 km/h (89 mph, 78 kn)
  • Range: 700 km (430 mi, 380 nmi)
  • Service ceiling: 6,000 m (20,000 ft)


  • Guns: 1x 7.7mm (0.303 in) machine gun in bow cockpit
  • Bombs: up to 265 lb (120 kg) of bombs

See also

Related lists


  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.
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