Bernard 70

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Bernard 70 Series
Bernard 75m.jpg
Bernard 75
Role Racing and Fighter monoplanes
National origin France
Manufacturer Bernard
First flight 1930 (Bernard 72)
Number built 3

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.

Design and development[edit]

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[edit]

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)[edit]

Data from [2][4]

General characteristics

  • Crew: 1
  • Length: 6.72 m (22 ft 1 in)
  • Wingspan: 9.20 m (30 ft 2 in)
  • Height: 2.50 m (8 ft 2 in)
  • Wing area: 13.45 m2 (144.8 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; 167 kn)
  • Service ceiling: 8,000 m (26,000 ft)

Armament

References[edit]

Notes[edit]

Bibliography[edit]

External links[edit]

  • [1] Bernard S-72
  • [2] Bernard S-73
  • [3] Bernard 74-01
  • [4] Bernard 74-02
  • [5] Bernard 75