aahhh.... die's makkelijk, De Junkers D.I.
Junkers began designing a special operational-support plane for the army, the CL I; and a fighter, the D I.
The first flight of the J.7, prototype of the future fighter, was in September 1917. The revolutionary design was confronted by a great variety of problems, which were atypical of conventional aircraft-vibration of wings in flight, bad controllability of ailerons, amongst others. But the biggest problem was the absence of a suitable engine, because the best engine was the Mercedes D.IIIa, which developed only 160 hp. It was enough for a traditional machine, but the completely new metal design was much heavier. Nevertheless, the aircraft was sound and not meant for aerobatics, so Junkers persevered with the new technology.
Skyhigh

Junkers began designing a special operational-support plane for the army, the CL I; and a fighter, the D I.
The first flight of the J.7, prototype of the future fighter, was in September 1917. The revolutionary design was confronted by a great variety of problems, which were atypical of conventional aircraft-vibration of wings in flight, bad controllability of ailerons, amongst others. But the biggest problem was the absence of a suitable engine, because the best engine was the Mercedes D.IIIa, which developed only 160 hp. It was enough for a traditional machine, but the completely new metal design was much heavier. Nevertheless, the aircraft was sound and not meant for aerobatics, so Junkers persevered with the new technology.
Skyhigh