/ Blackburn B.20
The Blackburn B-20 was an experimental aircraft, first flying in 1940, that attempted to drastically increase the performance of flying boat designs.
Blackburn Aircraft undertook an independent design study based on a patent filed by their chief designer, John Douglas Rennie for a retractable pontoon float that formed the planning hull.
The B-40 was an improved variant of the B-20 with Bristol Centaurus engines to meet a requirement for a small general purpose flying boat and specification R.13/40 was raised for it.
69 ft 8 in (21.23 m)
82 ft 0 in (24.99 m) floats retracted
25 ft 2 in (7.67 m) hull extended
1,066 sq ft (99.0 m2)
Max take-off weight
35,000 lb (15,876 kg)
2 × Rolls Royce Vulture X-24 liquid-cooled piston engines,
1,720 hp (1,280 kW) each
3 bladed Rotol constant speed feathering propellers
306 mph (492 km/h, 266 kn) at 15,000 ft (4,572 m)
1,500 mi (2,400 km, 1,300 nmi)
Provision for two turrets and other defensive positions
Bomb cells in centre section.
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