/ Aero A.11
The Aero A.11 was a biplane light bomber and reconnaissance aircraft built in Czechoslovakia between the First and Second World Wars.
It formed the basis for many other Czechoslovakian military aircraft of the inter-war period.
Around 250 were built, with some remaining in service at the outbreak of World War II.
Designed by Antonin Husnik, it was a development of the Aero A.12.
A Hispano-Suiza 8Fb-powered version, the A.11H-s was built for the Finnish Air Force, the only foreign operator of the type.
The Finnish had eight aircraft of this type and used them between 1927-1939.
Two-seat light bomber, reconnaissance biplane.
Export version for Finland.
Night bomber version.
Light bomber version.
8.2 m (26 ft 11 in)
12.8 m (42 ft 0 in)
3.1 m (10 ft 2 in)
36.5 m2 (393 sq ft)
1,080 kg (2,381 lb)
1,588 kg (3,501 lb)
1 × Breitfield-Danek Perun II 6-cylinder water-cooled in-line piston engine, 180 kW (240 hp)
176 kW (236 hp)
Walter W.IV (A.11)
2-bladed fixed-pitch propeller
216 km/h (134 mph, 117 kn) Ab.11
240 km/h (150 mph; 130 kn) A.11
190 km/h (120 mph, 100 kn)
750 km (470 mi, 400 nmi)
7,000 m (23,000 ft) Ab.11
7,600 m (24,934 ft) A.11
Rate of climb
3.82 m/s (752 ft/min)
Time to altitude
5,000 m (16,404 ft) in 19 minutes 30 seconds
43.7 kg/m2 (9.0 lb/sq ft) Ab.11
42 kg/m2 (8.6 lb/sq ft) A.11
0.120 kW/kg (0.073 hp/lb)
1× forward firing .303 in (7.7 mm) Vickers machine gun
2× .303 in (7.7 mm) Lewis machine gun in flexible mount for observer
200 kg (441 lb)
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