08/31/2014. Remarks by Johan Visschedijk: "The first single-seat scout product of the Halberstädter Flugzeug-Werke was the 100 hp Mercedes-engined D.I of late 1915. This was an orthodox slab-sided, two-bay aircraft typical of its period, with a Bush-type radiator located in the starboard side of the center section panel and a claw brake mounted in the center of the axle. The D.I was subsequently modified by installing an 120 hp Argus As II engine which was completely cowled in behind a car-type radiator, with an ungainly exhaust manifold ejecting over the top wing. In 1916 the aircraft was again re-engined with the 120 hp Mercedes D II, and in this form it went into production as the D.II."