Breda BT / Tebaldi Zari

1st Flight 1919

An engineer named Tebaldi designed the Tebaldi-Zari, which was a single-seat wooden sesquiplane with heavily staggered wings and a 142 kW (190 hp) Isotta Fraschini V.6, water-cooled 6-cylinder in-line engine, driving a two-bladed tractor propeller.

Its fixed, tailskid landing gear was of very unusual configuration, the main gear was of very wide track and had oversized main wheels with their axle incorporated into the lower wing.

The Zari brothers’ factory in Bovisio Mombello, Milan, manufactured the Tebaldi-Zari prototype in 1919, but Breda soon bought both the prototype and the design rights to the aircraft from Zari.

Breda re-engined the prototype with a 224 kW (300 hp) Hispano-Suiza HS-42 V-8 water-cooled engine.

In 1922 and drafted an agreement with the Italian government to produce three more aircraft, but no production order followed.

Undaunted, Breda modified the original prototype by arming it with two fixed, forward-firing 7.7 mm (0.303 in) Vickers machine-guns, modifying its upper wing so that it had a longer span and narrower chord, reducing the wing stagger, increasing the gap between the upper wing and fuselage, and increasing the angle of the outer struts so that they attached to the axle of the main wheels allowing the outer wing panels to be removed whenever a desire existed to test the Tebaldi-Zari as a sesquiplane.

After these modifications were complete, Breda set about another redesign of the aircraft, this time increasing the size of the ailerons and the chord of the upper wing and removing the outer panels of the lower wing permanently.

Thus modified, the original Tebaldi-Zari prototype was entered in the Italian 1923 fighter contest.

The Regia Aeronautica took no interest in a production order, and no further aircraft were built.

Specifications

Crew: 1

Length: 7.8 m (25 ft 7 in)

Wingspan: 9 m (29 ft 6 in)

Height: 2 m (6 ft 7 in)

Wing area: 22 m2 (240 sq ft)

Empty weight: 825 kg (1,819 lb)

Gross weight: 1,100 kg (2,425 lb)

Power plant: 1 × Hispano-Suiza HS-42 V-8 water-cooled piston engine, 220 kW (300 hp)

Propellers: 2-bladed fixed pitch propeller

Performance

Maximum speed: 255 km/h (158 mph, 138 kn) at 2,000 m (6,600 ft)

Endurance: 3 hours

Time to altitude: 5,000 m (16,000 ft) in 16 minutes

Armament

Guns: 2 × fixed forward-firing 7.7 mm (0.303 in) machine-guns.

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