The J8/J10/J11 series were very much just two-seat adaptations of the J7/J9 single-seat fighters. All derived their origin from the innovative J1 of 1915. They were all-metal low-wing cantilever monoplanes, the J10/J11 was powered by a 185hp BMW or Benz engine. Typical for their appearance was the corrugated light duralumin skin and the flat radiator in front of the engine.
The J.11 was a float-equipped derivation of the J10 two-seat escort and ground attack fighter, which had been built in quantity during 1918 as the Junkers CL.I.