The Letov Š-331 is a Czechoslovak single-seat double decker hunting plane built by Letov. The Š-331 was designed by engineer Alois Šmolík and a development from the Š-31 series. The Š-331 flew for the first time in the year 1935. The Š-331 was a prototype equipped with an even stronger engine compared with previous types. Only one device has been built, this has been delivered to Spanish Republicans during the Spanish Civil War.
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