Variants of the line beyond the D.1.01 prototype and D.1 pre-series aircraft included the D.1bis with pylon-raised mainplanes, the D.1ter with its wings on cabane (inverted Vee supports) struts, and the record-setting, one-off high-altitude D.8 fitting the Hispano-Suiza 8Fe 8-cylinder engine of 1921. The D.9 of 1924 followed with a Gnome-Rhone 9Ab "Jupiter IV" radial engine of 360 horsepower and larger-area wings - seeing limited production for foreign customers only. The D.12 of 1923 was concurrent to the D.9 and carried the Lorraine-Dietrich 12E W-12 engine of 450 horsepower. The D.19 of 1923 was similar in scope to the D.12 and differed in having the Hispano-Suiza 12Jb V-12 engine of 400 horsepower. Only two prototypes were built and these showcased in Belgium and Switzerland. EKW of Switzerland built two more to the specification and a total of seven D-19s eventually existed.
The export-minded D.21 appeared in the latter part of 1925 and represented the D.12 with a Hispano-Suiza 12Gb W-12 engine of 500 horsepower. These were then sold to Argentina, Paraguay, and Turkey in small numbers - though FMA of Argentina handled production of a further 30 units and took seven from EKW. Czechoslovakia added another 26 aircraft to the line as the Skoda D.1 with production by Skoda Works. A total of 100 D.21 aircraft were built.
The D.25 of 1925 was a twin-seat fighter based in the D.21 but carried the Lorraine-Dietrich 12Eb W-12 engine. Hanriot handled production of four units and were shipped to Argentina when French interest in the type waned. The D.26 was a training-centric development with Hispano-Wright 9Q 9-cylinder air-cooled engine of 340 horsepower. Eleven were formed in Switzerland with kits provided by Dewoitine.
The D.27 became a dedicated fighter and was powered by a Hispano-Suiza 12Mc V-12 engine. This design found favor in Romania where 100 were operated and 97 of the lot were built locally by IAR. EKW built 65 of the 66 operated by the Swiss Air Force. Yugoslavia took on a stock of four while the French Navy trialed the type on carriers as the "D.53".
The fighter was produced locally in the Kingdom of Italy by Ansaldo as the "AC". This became a series beginning with the one-off AC.1 (the improved D.1bis) followed by the reworked AC.2 (based in the D.1ter). As many as 112 units were built for the Italian Air Force. One-hundred fifty AC.3 fighters were built from the D.9 design. The AC.4 of 1927, born from the AC.2 (D.1ter), was another one-off example but carried the local FIAT A.20 V-12 engine of 420 horsepower.
Japan trialed a single D.1bis demonstrator for a time.
Total production of the D.1 series (including all variants) ended with about 500 examples being completed.
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