After successful trials by the Royal Navy, with submarine borne aircraft, using the Parnall Peto and the M-class submarines, the V-MF (Voenno-morskoj flot - Naval Fleet") wanted to deploy aircraft from cruiser submarines for open sea reconnaissance.
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In 1931 Chyetverikov had given a proposal for a submarine-launched folding flying boat to the head of TsKB (Tsentrahl'noye Konstrooktorskoye byuro - central construction bureau) but nothing was heard for two years until the NII (Naoochno-Issledovatel'skiy Institoot – scientific test institute) placed an order for two prototypes of the SPL.
SPL |