YK-18.1 Broad-foot isernes kreuz (iron cross) , plain black & black on white field - Sept 1914 to July 1916. There was no official formula for cross sizes or designs during this period. Initially, crosses were only applied to wings and rudder. Fusleage crosses were specified at an unknown date. Plain black iron crosses without white fields were not uncommon. During the early war period, crosses were often applied to both upper and lower wing surfaces!
YK-18.4 Iron cross , black on white field - July 1916 to Oct 1916. The German Inspektion der Fliegertruppen (Idflieg) specified that crosses had to be applied on a white field and were to be 500, 600, 700, 1000, 1200 and 1400mm square. Idflieg also standardised the iron cross design: height = H, width of foot = 0.4H, and radius of arm = 1.3H. (Note: Fokker disregarded the July 1916 directive to apply a thin white surround and continued with the full white field until the beam cross was specified in 1918.)
YK-18.2 Iron cross, black - Sept 1914 to March 1918. These plain black decals comply with the sizes specified in 1916 but have no white field.
YK-18.3 Iron cross, black with white line - October 1916 to March 1918. The white field was illiminated, and replaced with a 50mm white outline. The 50mm was not rigidly adhered to by all manufacturers.
YK-18.5 Broad balkan kreuz (beam cross) , black with white outline - March to April 1918. To avoid any confusion with Allied aircraft cockade markings, Idflieg directed that the iron cross was to be replaced with a beam cross. In the field, the existing iron crosse markings were simply overpainted by ground crews, hence the broad cross width which, of necessity, matched the broad foot of the overpainted iron cross.
YK-18.6 Beam cross, black with white outline - March to April 1918. Where aircraft were painted in the factory during this transitional period, a simple more balanced looking beam cross with thin white surround was not uncommon.
YK-18.7 Standard beam cross, black with broad white surround - April to May 1918. Idflieg finally issued specifications that beam crosses had to be 400, 600, and 1000mm square, with arms having a width-to-length ratio of 1:4. Wing and fuselage crosses were to have a 150mm white surround. The tail cross surround was often thinner and not applicable where the entire tail was painted white.
YK-18.8 Thin beam cross, black with white outline - May 1918 to Nov 1918. Idflieg issued specifications that the arms of the beam cross were to have a slimmer width to length ratio of 1:8, with a white border 1/4 width of the arm. The arms on fusleage and wings were to be full cord size with no white outline on cross ends. Note, from May to June 1918, Idflieg initially directed that the horizontal arm was to be shorter with a ratio of 4:5 of the vertical arm. In June 1918, Idflieg directed that both arms were to be the same length, as represented by the YK-18.8 decals, this specification remaining in force until the war's end.
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