The WSK SO-1 and WSK-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 Thirty SO-1s were built, this being superseded by the improved SO-3, of which a further 580 were built. The engine has a seven-stage compressor, annular combustion chambers, and a single-stage turbine.
SO-1
Original production. Overhaul life 200 hours.
SO-3
Improved version of SO-3, intended for tropical use. Modified compressor, combustion chamber and turbine. Overhaul life 400 hours.
SO-3W22
Modified version for PZL I-22 Iryda, 10.79 kN (2,425 lbf) rating, renamed
PZL-5.
PZL TS-11 Iskra
PZL I-22 Iryda
Data from Jane's All The World's Aircraft 1988-89.
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)
Compressor: Seven-stage all-steel axial compressor
Combustors: Annular with 24 combustors
Turbine: Single-stage axial flow
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: 3.4:1
