Avia BH-3 & BH-4


The Avia BH-3 was a fighter plane built in Czechoslovakia in 1921.

Conceptually a descendant of the BH-1 sports plane, it was a braced, low wing monoplane of conventional configuration and tailskid undercarriage.

Following favourable trials in June 1921, ten examples were ordered by the Czechoslovakian Air Force.

These were delivered in 1923 under the military designation B.3.

The type proved temperamental in service and was soon relegated to training duties, where it served until 1927.


The Avia BH-4 was a prototype fighter aircraft built in Czechoslovakia in 1922.

It was a development of the BH-3 fitted with a Hispano-Suiza 8 engine in an attempt to improve the aircraft’s performance.

To accommodate the new powerplant, the forward fuselage was considerably redesigned, and the structure in general and undercarriage in particular were strengthened.

Performance was found to be only marginally better than the BH-3, and development was quickly abandoned.




One pilot


7.00 m (23 ft 0 in)


10.20 m (33 ft 5 in)


3.10 m (10 ft 2 in)

Wing area

15.8 m2 (170 sq ft)

Empty weight

778 kg (1,715 lb)

Gross weight

1,025 kg (2,260 lb)


1 × BMW IIIa inline engine,

138 kW (185 hp)


Maximum speed

225 km/h (140 mph, 121 kn) at sea level;

240 km/h (150 mph; 130 kn) at 2,000 m (6,600 ft)


500 km (300 mi, 260 nmi)

Service ceiling

7,800 m (25,600 ft)

Rate of climb

7.9 m/s (1,560 ft/min)


2 × fixed forward firing .303 Vickers machine guns.


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