The Dongó was a biplane with wings of very high aspect ratio and modified elliptical plan, thus minimising induced drag.

[2] The Dongó's wings were simply braced compared with most biplanes of the day, with an arrangement made possible by the narrow chord and large stagger.

The steel framed cabane under the upper wing was intended to give the occupants protection in the case of an overturning.

It was powered by a 100 hp (75 kW) Oberursel U.I nine cylinder rotary engine, mounted in the nose on steel bearings behind a firewall.

This was a stand-in motor which would have been replaced by a lighter unit in production aircraft, so flight tests were conducted with the Oberursal throttled back to 60 hp (45 kW), the power for which the Dongó was designed.

[2] The date of the Dongó's first flight, made sometime during 1924, is not known exactly but by mid-December 1924 it had completed its tests in front of the official commission.

[2] It is not known if the Dongó ever received the intended lower powered engine, if the narrow wings met their design rigidity targets or if the "exceptionally good" maximum lift/drag ratio of about 16, remarkable for a fixed undercarriage biplane, was achieved.