The J8 was the prototype for the J.11.
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. Typical for their appearance was the corrugated light duralumin skin and the flat radiator in front of the engine.