A 1960 24-seat regional airliner with two M-603 engines, designed by eng. Dlouhy.
Engines – Power
Letov L-43
A 1960 STOL light transport and trainer. Two projected M-603 turboprops (1200 to 1400 hp each) or two twinned M-601; 20 to 25 passengers (8 to 10 in VIP configuration). Takeoff run only 15 m.
Letov L-42
A 1960 6-8 passengers business jet and trainer aircraft. Two rear-mounted M-701 turbojets (10,8 kN each). Cruise speed 870 km/h. Designed in two versions: low-wing (appears like typical bizjet) and more unconventional – high-wing.
Letov Š.50
A three-seat monoplane bomber prototype of 1938, powered by 2 x 430 hp 7-cyl Avia Rk-17 radials (optional 2 x Gnome-Rhône 14M).
Letov Š.46 / Š.146
Attack aircraft
Letov Š.39 / Š.139 / Š.239
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
Letov Š.38
A 1930 two-seat reconnaissance biplane, twin-finned, with gun turret. The twin-fins were transferable to the Š.328.
Letov Š.33
A 2- to 3-seat high-wing bomber, powered by a 790 hp W-12 Praga Asso 9-W. After a brief test hop, the aircraft was grounded for excessive vibration and replaced by Š.516.
Letov Š.32
A five-passenger high-wing monoplane tri-motor airliner of 1931. Power was by a 3 x 140 hp 14-cyl Walter Mars. Four were built.
The Š.328/528 series were reconnaissance/light bomber biplane developments of the Š.32.
Letov Š.231
A 1933 development of the Š.31 with a new wing profile, the aircraft is open cockpit and radial engine with a separate exhaust collector ring and Townend ring cowling. Power was a 550 hp Bristol Mercury.
The single-bay wings have N-type interplane struts and centre section struts.
Only one prototype and 23 production examples were produced, and the Š.231 was briefly used by the 35th and 36th Squadrons of the 2nd Air Regiment of the Czechoslovak Air Force.
Characteristics being somewhat short of the desirable and an opportunity presenting itself to cut losses, the fighter was withdrawn, crated and shipped to Spain where circumstances were dictating a more generous attitude to the shortcomings of flying equipment. In Spain, it was assigned to the 2a Escuadrilla of the Grupo de Gaza nüm 71 of the Republican air arm. The operational career of the š -231 was to be less than outstanding in Spain, a number being lost in training accidents and lack of spares back¬ing resulting in something of a nightmare for the maintenance personnel.
The Czech-designed, Finnish-built S.231 Smolik OH-SME was fitted with an enclosed canopy.
