The Fokker E.IV was essentially a lengthened Fokker E.III with a more powerful engine that was intended to enable the Eindecker to carry two or three machine guns, thereby increasing its firepower and providing redundancy if one gun jammed, which was a common occurrence at the time.
Oswald Boelcke, along with others, evaluated the E.IV at the Fokker Schwerin factory in November. He and other pilots discovered that mounting the much heavier engine onto the Eindecker airframe did not produce the aircraft Fokker was hoping for.
The increased inertial and gyroscopic forces of the spinning mass, of the larger engine, made the E.IV less manoeuvrable than the E.III. Not only that but the new engine was notoriously unreliable. It worked well when new but after only a few hours of operation it would loose power.
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