A two-seat, parasol monoplane sports plane (with HP slats) of 1931. After a prototype with a 36.8kW Orion LL-50 engine, 23 aircraft were built in 1934, powered by a 55 hp 3-cyl Walter Polaris radial engine.
An Š.139 development prototype (OK-ELA) of 1933 was powered by an 80 hp 7-cyl Pobjoy R radial.
Sixteen Š.239 developments were built, powered by an 85 hp 4-cyl Walter Minor 4. Ten went to flying clubs.
Engine: Walter Polaris, 40.5 kW / 55 hp
Propeller: two-blade wooden
Wingspan: 10,00 m
Length: 6,14 m
Wing Area: 14,00 m2
Empty Weight: 270 kg
Maximum Take-off Weight: 515 kg
Wing Loading: 36,8 kg/m2
Maximum Speed: 150 km/h
Cruise Speed: 130 km/h
Service Ceiling: 3300 m
Range: 480 km
Crew: 2-3
Undercarriage: fixed
All Aero 