WSK WN-3

WN-3

Narkiewicz WN-3 at the Polish Aviation Museum in Kraków.
Type	Radial engine
National origin	Poland
Manufacturer	WSK-Kalisz
Designer	Wiktor Narkiewicz
Major applications	PZL TS-8 Bies
Produced	1957-1960

The WN-3 was a Polish seven-cylinder air-cooled radial engine of the 1950s, produced by WSK-Kalisz, designed by Wiktor Narkiewicz.

Design and development

In 1946, Wiktor Narkiewicz, who prior to the Second World War was technical director of the Czechoslovakian Avia aero-engine factory, was appointed chief designer of the Polish Central Engine Office, and later the Aero-engine department of the Polish Aviation Institute (Instytut Lotnictwa, IL). He led the design of the WN-1, a 48 kW (65 hp) air-cooled flat-four piston engine which was the first post-war Polish aero-engine, followed by the 213 kW (285 hp) WN-2 in 1947, but both of these engines failed to enter production.^[1]^[2]

In 1952 Narkiewicz set up a small design team to design a new seven-cylinder radial engine, the WN-3. The first prototype, rated at 220 kW (300 hp) was completed in 1954, and by the time testing was completed in 1955, the engine's power rose to 250 kW (330 hp).^[1]^[2] The WN-3 entered production in 1956,^[3] powering the PZL TS-8 Bies training aircraft.^[2]

The engine was produced in 1957-1960 by WSK-Kalisz in Kalisz,^[4] it might be known also as PZL WN-3, or (in Western sources) as Narkiewicz WN-3.^[3]

Variants

WN-3: Production version, 250 kW (330 hp).^[1]
WN-4: Modified version for use in helicopters.^[2]

Applications

PZL TS-8 Bies^[5]
PZL MD-12 (prototype)^[6]
BŻ-4 Żuk (prototype)^[2]

Specifications

Data from Jane's All The World's Aircraft 1961–62^[1]

General characteristics

Type: Seven-cylinder single-row air-cooled radial engine
Bore: 135 mm (5.31 in)
Stroke: 134 mm (5.28 in)
Displacement: 13.4 L (820 cu in)
Length: 885 mm (34.8 in)
Diameter: 1,106 mm (43.5 in)
Dry weight: 240 kg (530 lb) dry

Components

Valvetrain: one inlet and one outlet valve per cylinder, pushrod actuated
Fuel system: K-14WN carburettor
Fuel type: petrol, 72 octane or more
Oil system: Dry sump

Performance

Power output: 250 kW (330 hp) at 2,500 rpm (max power)

211 kW (283 hp) (nominal)^[4]

180 kW (240 hp) at 2,100 rpm (econ cruise)

Specific power: 18.4 kW/L (0.40 hp/cu in)
Compression ratio: 6.2:1
Specific fuel consumption: .186–.201 kg/kWh (0.114–0.123 lb/MJ) at max power
.160 kg/kWh (0.098 lb/MJ) (econ cruise)

References

Wikimedia Commons has media related to Narkiewicz WN-3.

^ ^a ^b ^c ^d Taylor 1961, pp. 457–458.
^ ^a ^b ^c ^d ^e Flight 26 July 1957, p. 127.
^ ^a ^b Cynk Flight International 4 January 1962, p. 17.
^ ^a ^b Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945–1973 (in Polish). Warsaw: Wydawnictwo MON. pp. 145, 149–151.
^ Taylor 1961, pp. 121–122.
^ Taylor 1961, pp. 118–119.

"Aero Engines 1957". Flight. Vol. 72, no. 2531. 26 July 1957. p. 127.
Cynk, Jerzy B. (4 January 1962). "Progress in Poland". Flight International. Vol. 81, no. 2756. pp. 14–17.
Taylor, John W. R. (1961). Jane's All The World's Aircraft 1961–62. London: Sampson Low, Marston & Company, Ltd.
Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945–1973 [Polish aviation industry 1945-1973] (in Polish). Warsaw: Wydawnictwo MON. pp. 145, 149–151.

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