Krab was a submarine minelayer built for the Imperial Russian Navy during the 1910s. Completed in 1915, she served with the Black Sea Fleet during the First World War and executed three war patrols in
Krab, c. 1913
Mikhail Nalyotov
Drzewiecki drop collar
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The Drzewiecki drop collar was an external torpedo launching system most commonly used by the French and Imperial Russian Navies in the first two decades of the 20th century. It was designed by Stefan
Russian submarine Krab (1912)
…Krab was armed with a total of four 450-millimeter (17.7 in) torpedoes. Two of these were internal bow tubes and the others were in external rotating Drzewiecki drop collars, one on each broadside. She carried 60 PL-100 mines in two horizontal tunnels above the pressure hull. They were laid through the stern using an…
Empty drop collars on the Russian submarine Akula, 1909
The Bars-class submarine Lvitsa showing four of her eight drop collars loaded with torpedoes, about 1916–1917