Letov S-20

The Letov Š-20 was a fighter aircraft produced in Czechoslovakia during the 1920s. It was a conventional, single-bay biplane with unstaggered wings braced by N-struts. In overall appearance, it greatly resembled contemporary SPAD fighters. The fuselage and empennage were of welded steel tube construction and covered in fabric. The wings had a tubular metal spar but were otherwise wooden, and also fabric-skinned.

The Czechoslovakian Air Force bought 105 machines, and 10 examples were produced for Lithuania under the designation Š-20L. These remained in service until 1936 and 1935 respectively.

An Š-20 placed second in the single-engine category of the national President of the Republic air race in 1925, but fared better the following year. In the 1926 race, an Š-20 not only won this category but also set a new national airspeed record of 234 km/h (146 mph). This record was short-lived, however, since the prize for the fastest circuit was also won in an Š-20, and this raised the record to 245 km/h (153 mph).

A single prototype of an unarmed advanced trainer version was built as the Š-21, but this did not sell.

Variants

• Š-20 - initial production version
  • Š-20M - revised version with slimmed down rear fuselage (main production version for Czechoslovakia)
  • Š-20L - export version for Lithuania (10 built)
  • Š-20R - version with further revisions to fuselage (1 built)
  • Š-20J - version with Walter-built Bristol Jupiter engine
• Š-21 - trainer version with Hispano-Suiza 8Aa engine (1 built)

References

• Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions, 573. 
• Němeček, Václav (1968). Československá letadla. Prague: Naše Vojsko. 

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Letov S-20".