The PZL Rzeszów SO-1 and PZL Rzeszów SO-3 are Polish turbojet engines designed by the Instytut Lotnictwa (Institute of Aeronautics ) and manufactured by WSK PZL Rzeszów, to power the PZL TS-11 Iskra jet trainer. Thirty SO-1s were built, this being superseded by the improved SO-3, of which a further 580 were built.[1] The engine has a seven-stage compressor, annular combustion chambers, and a single-stage turbine.

SO-1/SO-3
SO-3W engine on display at the Polish Aviation Museum
Type	Turbojet
National origin	Poland
Manufacturer	WSK PZL Rzeszów
First run	November 1968
Major applications	PZL TS-11 Iskra
Number built	580

Variants

SO-1

Original production. Overhaul life 200 hours.[2]

SO-3

Improved version of SO-3, intended for tropical use. Modified compressor, combustion chamber and turbine.[2] Overhaul life 400 hours.[3]

SO-3W22

Modified version for PZL I-22 Iryda, 10.79 kN (2,425 lbf) rating, renamed PZL-5.[4]

Applications

• PZL TS-11 Iskra
• PZL I-22 Iryda

Specifications (SO-3)

Data from Jane's All The World's Aircraft 1988-89.[2]

General characteristics

• Type: Turbojet
• Length: 2,157 mm (84.7 in)
• Diameter: 707 mm (27.8 in) width, 764 mm (30.1 in) height
• Dry weight: 321 kg (708 lb)

Components

• Compressor: Seven-stage all-steel axial compressor
• Combustors: Annular with 24 combustors
• Turbine: Single-stage axial flow

Performance

• Maximum thrust: 10.8 kN (2,425 lbf) take-off, 9.8 kN (2,205 lbf) continuous
• Overall pressure ratio: 4.8:1
• Specific fuel consumption: 29.6 g/(kN⋅s) (1.04 lb/(lbf⋅h))
• Thrust-to-weight ratio: 3.4

See also

Comparable engines

• Armstrong Siddeley Viper

Related lists

• List of aircraft engines

References

Wikimedia Commons has media related to WSK SO-3.

• Lambert, Mark. Jane's All The World's Aircraft 1993-94. Coulsdon, Surry, UK:Jane's Data Division, 1993. ISBN 0-7106-1066-1.
• Taylor, John W. R. Jane's All The World's Aircraft 1988-89. Coulsdon, Surry, UK:Jane's Defence Data, 1988. ISBN 0-7106-0867-5.
• Taylor, Michael J. H. Brassey's World Aircraft & Systems Directory 1996/97. London:Brassey's, 1996. ISBN 1-85753-198-1.