The Avia B.135 was a Czechoslovak cantilever monoplane fighter aircraft. It was the production version of the Avia B.35 developed shortly before the war, based on the B.35/3 prototype but featuring a new all-metal wing.

Twelve aircraft were ordered by Bulgaria, along with a production licence. No licence production was undertaken, with the Bulgarian Air Force purchasing Messerschmitt Bf 109s from Germany instead.

General characteristics

• Crew: one
• Length: 8.5 m (27 ft 11 in)
• Wingspan: 10.85 m (35 ft 7 in)
• Height: 1.6 m (5 ft 3 in)
• Wing area: 17 m² (180 sq ft)
• Empty weight: 2,063 kg (4,548 lb)
• Max takeoff weight: 2,547 kg (5,615 lb)
• Powerplant: 1 × Avia (Hispano-Suiza) 12Ycrs V-12 liquid-cooled piston engine, 641 kW (860 hp)
• Propellers: 2-bladed wooden fixed pitch propeller

Performance

• Maximum speed: 535 km/h (332 mph, 289 kn) at 4,000 m (13,000 ft)
• Cruise speed: 460 km/h (290 mph, 250 kn)
• Range: 550 km (340 mi, 300 nmi)
• Service ceiling: 8,500 m (27,900 ft)
• Rate of climb: 13.5 m/s (2,660 ft/min)

Armament

• Guns:
• 1 × 20 mm (0.79 in) MG FF cannon
• 2 × 7.92 mm (0.312 in) vz. 30 (Česká zbrojovka Strakonice) machine guns

Avia B.135 Prototype

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Avia B.135 in the Bulgarian Air Force

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