Letov S-4

The Letov Š-4 was a Czechoslovak single-bay unstaggared biplane fighter and trainer in the 1920s.

Letov S-4
Class Aircraft
Type Fighter
Manufacturer Letov Kbely
Origin Czechoslovakia
Country Name Origin Year
Czechoslovakia 1922
Country Name Operational Year Retirement Year
Czechoslovakia 1923 1928 View
ManufacturerName Production From Production To Quantity
Letov Kbely 20 View

The Š-4 was first created in 1922 as an intended successor to the SPAD S.VII and S.XIII in service with the newly created Czechoslovak Air Force. It first flew in 1922, with fabric-covered wooden wings and a metal fuselage and tail.

The Czechoslovak Air Force ordered 20 Š-4s in 1922 and these were delivered in early 1923. The plane lived out the 1920s as a fighter and trainer, but by 1927 difficulties were being experienced due to the low manufacturing quality of the Š-4. As a result, all remaining Š-4s were upgraded to Š-4a trainer aircraft in 1928.

Role fighter
Manufacturer Letov Kbely
First flight 1922
Introduction 1923
Retired 1928
Primary user Czechoslovak Air Force
Number built 20

General characteristics

  • Crew: One
  • Length: 6.58m (21 ft 7 in)
  • Wingspan: 8.00 m (26 ft 2? in)
  • Height: 2.62m (8 ft 7? in)
  • Wing area: 16.43m² (176.86 ft²)
  • Empty weight: 673 kg (1,484 lb)
  • Loaded weight: 980 kg (2,160 lb)
  • Powerplant: 1 × Hispano-Suiza 8Ba, 164 kW (220 hp)


  • Maximum speed: 232 km/h (144 mph)
  • Range: 500km (310 miles)
  • Time to 3,000m : 9.3 minutes


  • Guns: 2 x synchronised 7.7mm Vickers gun

End notes