The Avia BH‑33 was a Czechoslovakian biplane fighter aircraft produced by the Avia aircraft manufacturer in the late 1920s. Designed by the engineering team of Pavel Beneš and Miroslav Hajn, the BH‑33 was a development of earlier Avia designs intended to meet the Czechoslovak Air Force’s requirement for a modern single‑seat fighter.
Design and development
- Configuration: Single‑seat, single‑engine biplane with a wooden frame and fabric covering.
- Powerplant: Typically equipped with a 450 hp (336 kW) Hispano‑Suiza 12Gb V12 liquid‑cooled engine; some later examples used upgraded engines of up to 500 hp.
- Armament: Standard armament consisted of two synchronized 7.7 mm (0.303 in) machine guns mounted on the forward fuselage.
- Construction: The aircraft featured a conventional biplane wing arrangement with staggered wings and a fixed, tailwheel undercarriage.
Operational history
- Service entry: First flight occurred in 1926, and the type entered service with the Czechoslovak Air Force in 1927.
- Service role: Initially employed as a frontline fighter, the BH‑33 was later relegated to training duties as newer monoplane designs entered service.
- Export: A limited number of aircraft were exported, most notably to the Kingdom of Yugoslavia, where they were used by the Yugoslav Royal Air Force.
- Numbers built: Production was modest; approximately 50–60 units were manufactured between 1926 and 1930.
Legacy
The Avia BH‑33 represents an intermediate stage in Czechoslovakia’s interwar aircraft development, bridging earlier wood‑and‑fabric biplanes and the later all‑metal monoplane fighters that would dominate the 1930s. Its service provided valuable experience for Czechoslovak pilots and engineers, contributing to the evolution of domestic aircraft design.
Specifications (typical BH‑33)
- Crew: 1 (pilot)
- Length: 7.2 m (23 ft 7 in)
- Wingspan: 9.2 m (30 ft 2 in)
- Height: 2.8 m (9 ft 2 in)
- Empty weight: ≈1,050 kg (2,315 lb)
- Maximum take‑off weight: ≈1,450 kg (3,197 lb)
- Powerplant: 1 × Hispano‑Suiza 12Gb V12, 450 hp (336 kW)
- Maximum speed: ≈230 km/h (143 mph) at sea level
- Range: ≈600 km (373 mi)
- Service ceiling: ≈8,500 m (27,900 ft)
- Armament: 2 × 7.7 mm (0.303 in) machine guns
All data reflect the most commonly recorded configuration; variations existed among individual aircraft.
