Three Iris Mk IIIs were fitted with 825 hp (615 kW) Rolls-Royce Buzzard IIMS piston engines.
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The prototype R.B.1, with the designation Iris I, and with the serial number N185, made its maiden flight from Blackburn's factory at Brough on 19 June 1926, being delivered to the Marine Aircraft Experimental Establishment at Felixstowe the next day, being fully tested during July and August.
Blackburn Rovers F.C. | Blackburn | Iris | Tony Blackburn | Iris (plant) | Iris Murdoch | iris | Paul Blackburn | Simon Blackburn | Iris Origo | Iris (opera) | Iris DeMent | Robert Blackburn (artist) | Robert Blackburn | Olly Blackburn | Iris West Allen | Iris Chacón | Donnie Iris | Blackburn Cathedral | Susan Smith Blackburn Prize | Marsha Blackburn | John Morley, 1st Viscount Morley of Blackburn | Iris West | Iris Tree | Iris pseudacorus | Iris Chang | Iris Berben | Iris (anatomy) | Glen Iris | Stanley & Iris |