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The Bernard 70 was a 1920s design for a French single-seat monoplane fighter aircraft by the Société des Avions Bernard. It was not built but was developed into a racing monoplane designated the Bernard S-72, (later Bernard S-73). It was further developed into single-seat fighters, the Bernard 74-01 and Bernard 74-02, although only two of the fighters were built.

Bernard 70 Series
Bernard 74
Role	Racing and Fighter monoplanes Type of aircraft
National origin	France
Manufacturer	Bernard
First flight	1930 (Bernard 72)
Number built	3

Design and development

The Bernard S-72 was a wooden stressed skin constructed cantilever low-wing monoplane powered by a Gnome-Rhône 5Bc[1] radial engine and had a fixed tailskid landing gear.[2] Flown by Paillard, the Bernard S-72 participated in the 1930 Coupe Michelin race. On 29 June, he took off from Le Bourget, landed successively in Reims, Nancy, Strasbourg, Dijon and Clermont-Ferrand, but unfortunately had to retire near Lyon as a result of engine failure.[1] The S-72 was re-engined with a Gnome-Rhône 7Kb[3] and re-designated the Bernard S-73. The S-73 was then developed into the Bernard 74 single-seat fighter and retained the Titan-Major engine.[2] Two prototypes were built with the first flying in February 1931, powered by a 280 hp (kw) Gnome-Rhône 7Kbs radial engine,[4] the second was fitted with a 268 kW (360 hp) Gnome-Rhône 7Kd engine and first flew in October 1931.[1] The first prototype 74 was re-engined with a Gnome-Rhône 9Kbrs radial engine and re-designated the Bernard 75 it was later used as a pilot-trainer.[2] No further aircraft were built.

Variants

Bernard 70

Unbuilt design for a single-seat fighter.[2]

Bernard S-72

Single-seater racing monoplane powered by a 179 kW (240 hp) Gnome-Rhône 5Bc radial engine, first flight in May 1930 Later converted to the Bernard S-73.[1][2]

Bernard S-73[3]

The Bernard 72 re-engined with a 224 kW (300 hp) Gnome-Rhône 7Kb radial engine, first flown in May 1930.[2][3]

Bernard 74-01

Single-seat fighter variant, powered by a 209 kW (280 hp) Gnome-Rhône 7Kbs radial engine, later converted to the Bernard 75.[2][4]

Bernard 74-02

A second prototype powered by a 268 kW (360 hp) Gnome-Rhône 7Kd, first flown on 21 October 1931[1]

Bernard 75

Prototype Bernard 74-01 fighter re-engined with a 373 kW (500 hp) Gnome-Rhône 9Kbrs radial engine and later used as a pilot-trainer.[2][5]

Specifications (Bernard 74.01)

Data from [2][4]

General characteristics

• Crew: 1
• Length: 6.72 m (22 ft 0 in)
• Wingspan: 9.20 m (30 ft 2 in)
• Height: 2.50 m (8 ft 3 in)
• Wing area: 13.45 m² (145 sq ft)
• Empty weight: 825 kg (1,819 lb)
• Max takeoff weight: 1,106 kg (2,438 lb)
• Powerplant: 1 × Gnome-Rhône 7Kbs radial piston engine, 209 kW (280 hp)
• Propellers: 2-bladed

Performance

• Maximum speed: 310 km/h (193 mph, 104 kn)
• Service ceiling: 8,000 m (26,247 ft)

Armament

• Guns: Two fixed 7.7mm (0.303in) synchronised Vickers machine-guns

References

Notes

Bibliography

• Bruner, Georges (December 1972). "Bernard 72, 73, 74C.1". Le Album de Fanatique de l'Aviation (in French) (39): 7–10. ISSN 0757-4169.
• Liron, Jean (1990). Les avions Bernard. Collection Docavia. Vol. 31. Paris: Éditions Larivière. ISBN 2-84890-065-2.
• The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.

External links

• Bernard S-72
• Bernard S-73
• Bernard 74-01
• Bernard 74-02
• Bernard 75

На других языках

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- [en] Bernard 70

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[fr] Bernard 74

Le Bernard 74 est un prototype d’avion militaire de l'entre-deux-guerres réalisé en France en 1931 par la Société des Avions Bernard.

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[it] Bernard 74

Il Bernard 74 fu un aereo da caccia monomotore, monoplano e monoposto con capacità acrobatiche, realizzato dall'azienda francese Société des Avions Bernard (S.A.B.) nei primi anni trenta e rimasto allo stadio di prototipo.

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