|Role||Patrol flying boat|
|First flight||18 July 1930|
The Blackburn R.B.2 Sydney was a long-range maritime patrol flying boat developed for the Royal Air Force in 1930, in response to Air Ministry Specification R.5/27. It was a parasol-winged braced monoplane of typical flying boat arrangement with triple tail fins and its three engines arranged on the wing's leading edge. After evaluation, it was not ordered into production and no further examples were built.
With development of the Sydney abandoned, construction of a cargo-carrying variant powered by radial engines, the C.B.2 Nile was also put to an end.
Specifications (Sydney) 
Data from British Flying Boats 
- Crew: Two pilots, plus gunners
- Length: 65 ft 7 in (19.99 m)
- Wingspan: 100 ft (30.49 m)
- Height: 20 ft 4 in (6.20 m)
- Wing area: 1,500 ft² (139.4 m²)
- Empty weight: 17,065 lb (7,741 kg)
- Loaded weight: 23,350 lb (10,591 kg)
- Powerplant: 3 × Rolls-Royce F.XII MS, 525 hp (381 kW) each
- Maximum speed: 123 mph (107 kn, 198 km/h)
- Cruise speed: 100 mph (87 kn, 161 km/h)
- Service ceiling: 16,500 ft (5,030 m)
- Rate of climb: 390 ft/min (2.0 m/s)
- Endurance:7 hours 30 minutes
- Guns: 3 × trainable .303 in (7.7 mm) Lewis Gun in open bow, dorsal and ventral positions
- Bombs: 1,102 lb (500 kg) of bombs or 2 × torpedoes
See also 
- Related lists
- London 2003, pp.260-261.
- London, Peter (2003). British Flying Boats. Stroud, UK: Sutton Publishing. ISBN 0-7509-2695-3.
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 158.
- The Blackburn "Sydney" Flying Boat in Flight, September 5, 1930
- Blackburn flying boats 1924-1940
- Picture of the Sydney N241
- "Blackburn R.B. 2 Sydney", Youtube.com first flight
- "Huge All-Metal Flying Boat Weighs Ten Tons", March 1931, Popular Mechanics