The Aero A.21 was a biplane military trainer aircraft developed in Czechoslovakia from the Aero A.11 reconnaissance-bomber. The aircraft was developed specifically as a night-trainer, to teach Czech Air Force pilots instrument flying techniques.

Specifications (A.21)

Data from On "nocturne" tchéoslovaque: l'Aero A-21^[1]

General characteristics

• Crew: 2
• Length: 8.10 m (26 ft 7 in)
• Wingspan: 12.78 m (41 ft 11 in)
• Height: 3.16 m (10 ft 4 in)
• Wing area: 36.51 m² (393.0 sq ft)
• Empty weight: 950 kg (2,094 lb)
• Gross weight: 1,240 kg (2,734 lb)
• Powerplant: 1 × Breitfeld & Danek Perun I 6-cyl. water-cooled in-line piston engine, 130 kW (180 hp)

Performance

• Maximum speed: 170 km/h (110 mph, 92 kn)
• Cruise speed: 150 km/h (93 mph, 81 kn)
• Range: 340 km (210 mi, 180 nmi)
• Service ceiling: 6,500 m (21,300 ft)
• Time to altitude: 21 min 3 s to 3,000 m (9,800 ft)
• Wing loading: 36 kg/m² (7.4 lb/sq ft)

Operators

• Czechoslovakia.