Avia BH-11

The Avia BH-11 was a two seat sport aircraft built in Czechoslovakia in 1923, a further development of the Avia BH-9.

The main changes in this version involved a redesign of the forward fuselage.

15 examples were ordered by the Czechoslovakian Army as trainers and general liaison aircraft, these operated under the military designation B.11.

Six years after the BH-11 first flew, a new version was produced for the civil market as the BH-11B Antelope.

This replaced the original Walter NZ 60 45 kW (60 hp) engine with a Walter Vega of 63 kW (85 hp) and was built in small numbers.

As a further development, the BH-11C retained the original engine but the wingspan was increased by 1.4 m (4 ft 6 in).

Specifications

Crew

2

Length

6.64 m (21 ft 9 in)

Wingspan

9.72 m (31 ft 11 in)

Height

2.53 m (8 ft 4 in)

Wing area

13.6 m2 (146 sq ft)

Empty weight

360 kg (794 lb)

Gross weight

610 kg (1,345 lb)

Fuel capacity

80 kg (180 lb) fuel and oil

Powerplant

1 × Walter NZ 60 5-cylinder air cooled radial piston engine,

45 kW (60 hp)

Propellers

2-bladed fixed-pitch propeller

Performance

Maximum speed

160 km/h (99 mph, 86 kn)

Stall speed

75 km/h (47 mph, 40 kn)

Range

650 km (400 mi, 350 nmi)

Service ceiling

3,300 m (10,800 ft)

Rate of climb

2.7 m/s (530 ft/min)

Time to altitude

1,000 m (3,300 ft) in 6 minutes,

2,000 m (6,600 ft) in 18 minutes

Wing loading

45 kg/m2 (9.2 lb/sq ft)

Power/mass

0.0733 kW/kg (0.0446 hp/lb)