The 1923 Feiro I was the first Hungarian designed and built civil transport aircraft, modified in 1925 by an engine change into the Feiru Daru (Crane).

[2] It was a high wing monoplane, with an aerodynamically thick (thickess/chord ratio 14%) Joukowski-Göttingen "tadpole shaped" airfoil over the whole span.

In plan it had constant chord and was unswept; the wingtips were angled and the short ailerons tapered slightly outboard.

The Le Rhone rotary was partially enclosed within an open-bottomed engine cowling and was mounted on steel tube bearings.

There were two firewalls between engine and cabin and the carburetter, gravity-fed fuel from a tank in the central wing, was placed in the ventilated space between them.

Because the high engine fairing reached the underside of the wing leading edge, there was no central forward view from the controls; instead, there were deep openings on either side.

[4] Hungary's manufacturers lost many of their material suppliers when the country's boundaries were shrunk by the Treaty of Trianon after the end of World War I.