Breguet 670

Breguet 670
Role	18 seat airliner
National origin	France
Manufacturer	Société des Avions Louis Breguet
First flight	1 or 16 March 1935
Number built	1

The Breguet 670, Breguet 670T or Breguet-Wibault 670 was a French twin engine, all metal. eighteen seat airliner with a retractable undercarriage flown in 1935. Only one was built.

In 1934 Breguet acquired Chantiers Aéronautiques Wibault-Penhoët and produced some of their unbuilt designs. The Breguet 670 was one of these, an all-metal, low wing, twin engine airliner accommodating eighteen passengers. Engine layout apart, it was similar to though larger than the successful trimotor Wibault-Penhoët 282, used by six French airlines including Air France. In the mid-1930s companies worldwide were designing and producing twin engine aircraft of the same configuration, most notably the earlier Douglas DC-2, which was less powerful and carried only fourteen passengers.

The Breguet 670's wing had a constant thickness centre section, with wing roots faired into the fuselage on its trailing edges, and two outer panels, tapering in both thickness and plan to semi-elliptical tips. It was a two spar structure, with sheet duralumin, I-section spars which had extruded webs, and was duralumin skinned. Narrow chord slotted ailerons occupied the outer two-thirds of the span and the rest fitted with similar flaps.

It was powered by two wing-mounted 615 kW (825 hp) Gnome-Rhône 14Krs Mistral Major fourteen cylinder radial engines driving three blade variable pitch propellers. The engine mountings were steel tube structures supported by the longerons; the engine cowlings were most prominent above the wings. The main legs of the 5.56 m (18 ft 3 in) tracklanding gear, with fairings mounted on the front of, them retracted rearwards into the cowlings. The undercarriage was completed with a oleo mounted, steerable tailwheel. There were fuel tanks in the central section of the wings between both the engines and the longerons.

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