Blackburn R.B.1 Iris


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Blackburn R.B.1 Iris

The five-seat Iris was an elegant biplane flying-boat. The first of only eight built flew on 19 June 1926. The single Iris I, powered by three 484.4kW Rolls-Royce Condor III engines, was converted into the II with 503kW Condor IIIA. It was followed by four Iris Ill with 503kW Condor IIIB engines (entering service with the RAF in 1930); a single Mk IV (the first prototype with 596kW Armstrong Siddeley Leopard Ill, mounted as two tractors and one pusher); and three V with 615kW Rolls-Royce Buzzard IIMS engines. A III was also brought up to V standard.

Blackburn R.B.1B Iris IIIA three-view drawing of Blackburn R.B.1B Iris III (800 x 765)

 ENGINE3 x Rolls-Royce "Condor" IIIB, 503kW
  Take-off weight13376 kg29489 lb
  Empty weight8640 kg19048 lb
  Wingspan29.57 m97 ft 0 in
  Length20.54 m67 ft 5 in
  Height7.77 m26 ft 6 in
  Wing area207.07 m22228.88 sq ft
  Max. speed190 km/h118 mph
  Cruise speed156 km/h97 mph
  Ceiling3230 m10600 ft
  Range w/max.fuel1287 km800 miles
 ARMAMENT3 x 7.7mm machine-guns, 900kg bombs

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