Junkers F 13

The Junkers F.13, also known as the F 13, was the world's first all-metal transport aircraft, developed in Germany at the end of World War I.
It was an advanced cantilever-wing monoplane, with enclosed accommodation for four passengers. Over 300 were sold.
It was in production for 13 years and it was in commercial service for almost 20 years.

It was designed by Otto Reuter and hat its first flight on June 25, 1919. It was introduced in 1920.
Behind the single engine was a semi-enclosed cockpit for the crew, roofed but without side glazing.
There was an enclosed and heated cabin for four passengers with windows and doors in the fuselage sides.
Passenger seats were fitted with seat belts, unusual for the time.

The F.13 used a fixed conventional split landing gear with a rear skid, though some variants landed on floats or on skis.

The F 13 first flew on 25 June 1919, powered by a 127 kW (170 hp) Mercedes D IIIa in-line upright water-cooled engine.
The first production machines had a wing of greater span and area and had the more powerful 140 kW (185 hp) BMW IIIa upright in-line water-cooled motor.

Source: Wikipedia

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