Farman F.180 Oiseau Bleu

The aircraft was powered by two Farman piston engines mounted in push-pull configuration in tandem beneath the upper wing centre section, which was supported above the fuselage on two pairs of struts.

One design flaw was that the undercarriage had a very narrow track main gear wheels for a heavy aircraft, thus producing a rough ride on grass airfields.

[1] To this end, the aircraft was designed to fly routes of 500, 1,000, and 1,500 km (311, 821, and 932 miles respectively) while carrying corresponding payloads of 2,500, 2,000, and 1,500 kg (5,512, 4,409 and 3,307 lb.

A further objective of the design team was for the new aircraft to possess improved performance in terms of operational efficiency, passenger comfort, and safety.

[3] Specific elements minimised in comparison to conventional twin-engined biplanes of the era included a reduction of the number of struts used, little use of bracing wire, and the elimination of one engine nacelle.

[5] The cylindrical-shaped fuselage was designed as such out of efforts to maximise the available internal space for the passenger cabin while also reducing the drag incurred.

[3] The undercarriage was deliberately designed to be as low as was feasibly possible, both in order to lower the aircraft's overall center of gravity and to minimise drag.

[7] Data from The Illustrated Encyclopedia of Aircraft,[8] Farman two-engine commercial biplane F.180 (French)[9]General characteristics Performance

Farman F.180 fuselage and engine mockup at the Berlin Air Show in 1928
Farman F.180 3-view drawing from NACA Aircraft Circular No.88