The Fizir F1V (Serbian Cyrillic:Физир Ф1В) was the basis from which engineer Rudolf Fizir developed a series of single-engined, two-seat, reconnaissance biplanes fitted with different engines. Construction was carried out in the Yugoslav aircraft factories Zmaj and Rogožarski between 1928 and 1932. Design and development Rudolf Fizir designed a biplane reconnaissance aircraft during the first war of the Kingdom of Yugoslavia (KSHS) during 1925. It was equipped with a 260 hp Maybach engine and the prototype was made in the workshop of the Novi Sad Air Aviation Regiment. The prototype was first flown in late November 1925 by test pilot Vladimir Striževski. Further development of the basic Fizir design was undertaken with the assistance of Dušan Stankov resulting in the construction of five additional prototypes and the delivery of 32 production machines designated Fizir F1V (commonly referred to as "Fizir-Maybach 260 hp") over the next three years. While these had been built at the Rogožarski factory, Zmaj built 15 of the Fizir F1V-Wright version and 5 Jupiter-engined Fizir F1M floatplanes for Naval Aviation in 1930. Zmaj was also responsible for conversion of several Fizir-Maybach trainers to Lorraine-Dietrich engines in 1932, which extended the service life of these machines under the new name Fizir-Lorraine 400 hp. Operational history Just after the factory tests, on 8 October 1926 pilot Vladimir Striževski flew the aircraft from Novi Sad to Skopje to Mostar to Rajlovac (Sarajevo) to Zagreb and returned to Novi Sad – a distance of 1,410 km – over a period of 8 hours and 40 minutes. As a result of this performance, the aircraft was entered in an international competition of the Little Entente in Poland where it was one of 14 entries. Though some of the other competitors had aircraft with twice the power, it came in first place. Thanks to this success and satisfactory test results, it was decided to put the Fizir F1V into serial production, but as an intermediate trainer rather than as a reconnaissance aircraft with the result that some changes were made, such as adding dual controls. Difficulties with supplies of the original Maybach engine resulted in a variety of other engines being fitted, from which the individual variants would derive their names. The Fizir F1V was used at the flying schools to transition pupils to reconnaissance and bomber aircraft, replacing the worn-out Hansa-Brandenburg C.I as production permitted. Twenty examples were produced by the end