Zmaj Fizir FN

The Zmaj Fizir FN was a plane designed for primary 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.

Fizir FN had an exceptional low-speed stability, a desirable trait for a training aircraft, and was reliable and easy to maintain.

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.

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.


Fizir FN Mercedes

Mercedes 88 kW engine

Fizir FN Walter

Walter NZ-120 88 kW engine

Fizir FN Mars I

Seaplane with the Walter Mars I 106 kW engine





8.80 m (28 ft 10 in)


11.20 m (36 ft 9 in)


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)


1 × Walter NZ 120 7-cylinder radial,

88 kW (118 hp)




Maximum speed

140 km/h (87 mph, 76 kn)

Cruise speed

120 km/h (75 mph, 65 kn)


540 km (340 mi, 290 nmi)

Service ceiling

6,500 m (21,300 ft)



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