May 1918 – 25 June 1918
Idflieg specified a new cross design. The vertical arm was now to be full chord or fuselage depth, and the ratio of vertical to horizontal arm length was 5:4. Arm width-to-length ratio was changed to 1:8, and the width of the white border to the width of the arm was 1:4. The ends of the arms were not bordered. By this time, white rudders seem to be fairly standard among most major manufacturers
Own work
Kwasura