Avia BH-11
# 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, and 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).

A BH-11A and a BH-11C are preserved at the Prague Aviation Museum, Kbely.

## Specifications (BH-11)

Data from Jane's all the World's Aircraft 1928

General characteristics

* 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 $m^2$ (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 $kg/m^2$ (9.2 lb/sq ft)
* Power/mass: 0.0733 kW/kg (0.0446 hp/lb)
