[Dan_San_Abbott]

Uhlan:
The Fokker E.I was derived from the Fokker M.5 and was designated Fok.M.5k powered with a Oberursel U.O 80 Ps
Gnome copy engine. Serial numbers E.1/15 to E.6/15 were designated Fok.E. Commencing with Fokker M.14, werke nr. 252, was designed from scratch as a fighter. It also initially was powered with the Oberursel U.O 80 Ps engine. The span was reduced from 8950mm on the M.5k to 8520mm
on the Fokker M.14. The length was increased from 6750m to 7200m. The height of both was 2400mm. the empty weight was decreased from 358 kg. on the M.5k to 338kg on the M.14. The useful load was increased from 205 kg to 210kg. It was intended to change engines to the 100Ps Oberursel U.I. The Fok.M.14 was designated Fok.E.II. The Fok.E. was re-designated Fok.E.I.
The following machines were Fok.E.II aircraft, 7, 8, 20 to 25, 33 to 36, 37, 43, 46, 62, 65 to 94/15. All other numbers below were Fok.E.I machines.
With the reduced wing area the M.14 did not perform as well as hoped. With Fokker M.14, w.n. 317, the wing span was increased to 9520mm and was applied on Fok.E.II 66/15 and subsequent.
All the Fok.E.II machines from at least Fok.E.II 66/15 were powered with the Oberursel 100 Ps U.I engine.
Fokker M.14 werke nummer 346, was designated Fok.E.III95/15. The Fokker E.II was discontinued. All subsequent production aircraft were Fokker E.III machines until Fok.w.n.373 at which time Fok.M.15 was made and designated Fok.E.IV 122/15. From my data I have 66 Fok.E.I machines, 40 E.IIs, 162 E.III aircraft and 18 Fok.E.IV planes built.
Sorting these machines out was a very difficult process.
Blue skies,
Dan-San