The Avia BH-11, a two-seater sport aircraft manufactured in Czechoslovakia in 1923, was an advancement of the Avia BH-9 with significant modifications made to the front fuselage.
The Czechoslovakian Army placed an order for 15 units of the Avia BH-11 to be used as trainers and general liaison aircraft, which were designated as B.11 for military purposes.
Six years post the maiden flight of the BH-11, a new variant known as the BH-11B Antelope was introduced for the civilian market, featuring a Walter Vega engine of 63 kW (85 hp) instead of the original Walter NZ 60 45 kW (60 hp) engine.
The BH-11B Antelope was produced in limited quantities, showcasing the upgrade from the original engine to the more powerful Walter Vega engine.
A subsequent model, the BH-11C, maintained the original engine while incorporating a wingspan extension of 1.4 m (4 ft 6 in) as part of its development.
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)
Sources
Czechoslovakian Air Force, 1918-1970, Aircam Aviation Special 05-Richard Ward, Zdenek Titz & Gordon C. Davies.
Ceskoslovenské Letectvo, 1918-1924-Jiří Rajlich & Jiří Sehnal.
