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Blackburn Iris: Wikis


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The Blackburn Iris Mk III S1263
Role Flying Boat
National origin United Kingdom
Manufacturer Blackburn Aircraft
First flight 1926
Introduced 1929
Retired 1933
Primary user Royal Air Force
Number built 5
Variants Blackburn Perth

The Blackburn Iris was a 1926 British biplane flying boat.

The Iris Mark V was developed into the aircraft that subsequently became the Blackburn Perth.



R.B.1 Iris I
Prototype. One built.
R.B.1A Iris II
The Iris I was fitted with three 675 hp (503 kW) Rolls-Royce Condor IIIA inline piston engines.
R.B.1B Iris III
Five-seat long-range maritime reconnaissance flying boat for the Royal Air Force. Powered by three 675 hp (503 kW) Rolls-Royce Condor IIIB inline piston engines. Four built.
R.B.1C Iris IV
The Iris II was fitted with three 800 hp (600 kW) Armstrong Siddeley Leopard III radial piston engines.
R.B.1D Iris V
This was the final variant. Three Iris Mk IIIs were fitted with 825 hp (615 kW) Rolls-Royce Buzzard IIMS piston engines.


 United Kingdom

Specifications (Iris III)

Data from Aircraft of the Royal Air Force 1918-57 [1]

General characteristics

  • Crew: Five
  • Length: 67 ft 4¾ in (20.54 m)
  • Wingspan: 97 ft 0 in (29.6 m)
  • Height: 25 ft 5 in (7.7 m)
  • Wing area: 2,461 ft² (228.7 m²)
  • Empty weight: 19,301 lb (8,773 kg)
  • Loaded weight: 29,000 lb (13,182 kg)
  • Max takeoff weight: 29,490 lb (13,405 kg)
  • Powerplant:Rolls-Royce Condor H-1B piston engines, 675 hp (503 kW) each



  • 3 × .303 in (7.7 mm) Vickers machine guns, 1 mounted forward and two aft in open cockpits
  • Up to 1,984 lb (900 kg) of bombs

See also

Related lists


  1. ^ Thetford 1957, pp. 74—75.
  • Thetford, Owen (1957). Aircraft of the Royal Air Force 1918-57 (1st edition ed.). London: Putnam.  


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