Zmaj Fizir FN

The Zmaj Fizir FN (Serbian Cyrillic: Змај Физир ФН) was a plane designed for primary (initial) training of pilots in Yugoslavia before World War II. It was constructed in Zmaj, a Zemun-based factory, in the Rogožarski factory in Belgrade, and Albatros in Sremska Mitrovica.

Zmaj Fizir FN
Fizir FN on display in the Museum of Aviation
Role Trainer (aircraft)
National origin Yugoslav
Manufacturer Zmaj aircraft,

Albatros Sremska Mitrovica

Designer Rudolf Fizir, Dušan Stankov and Ivan Rukavina
First flight May 1929[1]
Introduction 1931
Retired 1950
Primary user Yugoslav Royal Air Force
Number built 206[2]+ 4 Floatplane[3]

Fizir FN had an exceptional low-speed stability, a desirable trait for a training aircraft, and was reliable and easy to maintain.[4] It was also widely used as a sport aircraft.[1]

Design and development

The first prototype of Fizir FN (Fizir trainer) aircraft was designed and manufactured in Rudolf Fizir Workshop in Petrovaradin in 1929. Rudolf Fizir's workshop did not have the capacity for industrial production of aircraft, their area of work was design and prototyping. Although being small, this workshop played a significant role in the development of Yugoslav aeronautics after it emerged and was used for the training of engineers who later became important and famous in our aeronautical engineering.[5] Many successful airplane prototypes from this workshop were later produced in Yugoslav airplane factories.

Fizir FN was a single-engine two-seat biplane trainer with a pair of struts on each side. The wings were rounded at the tips and the flaps were located on both the lower and upper wings. The landing gear was fixed to the hinge axis. For amortization either coil springs and rubber (old type) or the rings of sand (later types) were used. The wooden structure of the fuselage and the wings were covered with a canvas. While the aircraft was in production, it underwent several refinements, aircraft was continually being refined, so that there are several sub-types of these aircraft, depending on engines installed.

Operational history

The first three aircraft was produced by the Zmaj aircraft factory for the Aero Club.[6] Given excellent flight characteristics, the Air Force Command decided to use it to replace all training aircraft that had been in use for basic training previously. At that time basic pilot training schools used the Ikarus SB-1 (Mali Brandenburg) with a 73 kW (98 hp) Mercedes engine, Zmaj built Hanriot H-320 with 90 kW (120 hp) Salmson engines manufactured in 1928. In the beginning of 1931, Zmaj produced and delivered first 20 serial Fizir FN aircraft with the Walter NZ 120 radial engine and 10 with the 89 kW (120 hp) Mercedes D.II inline engine.[1] By 1939, Zmaj produced 137 aircraft, Rogožarski fabricated 40 aircraft and in the 1940 the Sremska Mitrovica-based Albatros factory produced additional 20 aircraft of this type. Before the war, the Navy Aviation ordered four hydro Fizir FN (Floatplane) with floats and with a more powerful 106 kW (142 hp) Walter Mars I engine. The production of last 10 Fizir FN aircraft started in 1943 in Zmaj for the Croatian Air Force, but were not finished until the liberation, when they were handed over to the Aeronautical Federation of Yugoslavia.[2]

During World War II, Yugoslav-manufactured aircraft were used by Italy in Albania, and by IS Croatia. Aircraft Fizir FN was reliable, easy to fly and maintain, so this plane stayed operative for many years (almost till 1950), as basic pilot training aircraft, both in military and civilian aviation, including sports flying.

There are two surviving Fizir FN aircraft.[1] One (serial number 9009, registration YU-CAY) is kept in the Museum of Yugoslav aviation at Belgrade Nikola Tesla airport.[7] The other, designated Fizir FNH, which is a Fizir FN converted to a floatplane (serial number 9002, registration YU-CGO), is kept in Technical Museum, Zagreb.[8]


 Kingdom of Yugoslavia


  • Fizir FN – Mercedes – with the engine Mercedes 88 kW,
  • Fizir FN – Walter – with the engine Walter NZ-120 88 kW and
  • Fizir FN – Walter Mars I – seaplane with the engine Walter Mars I 106 kW, (seaplane nicknamed "Little Fizir" or "Fizir Mars").


Data from [10]

General characteristics

  • Crew: 2
  • Length: 8.80 m (28 ft 10 in)
  • Wingspan: 11.20 m (36 ft 9 in)
  • Height: 3.10 m (10 ft 2 in)
  • Wing area: 32.50 m2 (349.8 sq ft)
  • Empty weight: 820 kg (1,808 lb)
  • Gross weight: 1,426 kg (3,144 lb)
  • Powerplant: 1 × Walter NZ 120 7-cylinder radial, 88 kW (118 hp)
  • Propellers: 2-bladed


  • Maximum speed: 140 km/h (87 mph, 76 kn)
  • Cruise speed: 120 km/h (75 mph, 65 kn)
  • Range: 540 km (340 mi, 290 nmi)
  • Service ceiling: 6,500 m (21,300 ft)

See also


  1. Fulanović 2007, p. 374.
  2. Петровић, O. (2004). Војни аероплани Краљевине СХС/Југославије (Део II: 1931–1941.). Београд: МВЈ Лет 3.
  3. Isaić, Vladimir; Frka Danijel (2010.). "Seaplane purchases in the period 1921–1940" (in English)). Naval Aviation at the eastern coast of the Adriatic Sea 1918–1941 (Volume 1). -{CRO}--Zagreb: Tko zna zna. pp. 147–148. ISBN 978-953-97564-6-6.
  4. Fulanović 2007, p. 375.
  5. С. Микић; Историја југословенског ваздухопловства, Шт. Д. Грегорић, Београд,1933.
  6. Janic, Cedomir; Ognjan Petrovic (2011). The Century of Sport Aviation in Serbia. Beograd: Aerokomunikacije. pp. 1–16.
  8. Fulanović 2007.
  9. В. Микић; Зракопловство НДХ 1941–1945, ВИИВЈ, Београд, 2000.
  10. Janić, Čedomir, Rogožarski AŽR, Aeromagazin (in Serbian), 17, p. 34, ISSN 1450-6068


  • Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. ISBN 0-7153-5734-4.
  • Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2 ed.). Wellingborough: Patrick Stephens Ltd. p. 95. ISBN 1-85260-163-9.
  • Janic, Cedomir; Ognjan Petroivic (2011). The Century of Sport Aviation in Serbia. Beograd: Aerokomunikacije. pp. 1–16.
  • Janić, Čedomir; Petrović, O. (2011). Short History of Aviation in Serbia. Beograd: Aerokomunikacije. ISBN 978-86-913973-2-6.
  • Зачетници авијације, ИРО "Вук Караџић" и "Службени лист СФРЈ", Београд, 1988.
  • Д. Лучић: Основи практичне аеродинамике са описима аероплана, Библиотека "Ваздухопловног Гласника", Нови Сад, 1936,
  • О. Петровић., Војни аероплани Краљевине СХС/Југославије (Део II: 1931–1941.), Лет 3/2004. Београд, 2004.
  • 3. Ж. Вељовић., Пет деценија Змаја, ИПМ Змај Земун, 1972.
  • В. Илић., Школе војног ваздухопловства Краљевине СХС/Југославије, Лет 3/2004. Београд, 2004.
  • Војна Енциклопедија, Београд, 1971.
  • С. Микић; Историја југословенског ваздухопловства, Шт. Д. Грегорић, Београд,1933.
  • Ш. Оштрић и М. Мицевски.; Летећи Чунови: Чамци који лете – летилице које плове, Изложба фотографија, Галерија '73, Београд, 14–27. септембра 2007. год.
  • В. Микић; Зракопловство НДХ 1941–1945, ВИИВЈ, Београд, 2000.
  • Јанић, Чедомир; Петровић, Огњан; (2010.). Век авијације у Србији 1910–2010, 225 значајних летелица (на ((sr))). Београд: Аерокомуникације. ISBN 978-86-913973-0-2.
  • Isaić, Vladimir; Frka Danijel (2010). "Seaplane purchases in the period 1921–1940". Naval Aviation at the eastern coast of the Adriatic Sea 1918–1941. 1. -{CRO}--Zagreb: Tko zna zna. pp. 147–148. ISBN 978-953-97564-6-6.
  • Fulanović, Davor (2007). "Vrednovanje pokretne tehničke baštine u Tehničkom muzeju : istraživanje, obnova i predstavljanje velikih izložaka - brodskog motora Napier Deltic i aviona Fizir FNH" (PDF). Osječki zbornik (in Croatian). Osijek: Museum of Slavonia. 28: 367–381. Retrieved 10 June 2019.
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