HMS Buttercup
评论
12 31 December 2020, 16:19
Selman Yararthanks, it was not an ideal build, i made a lot of mistakes. I'll do some weathering and rust spots later, similar to the box art...
1 January 2021, 08:15
Selman YararDavid it is called "acoustic hammer". I found some information at mcdoa.org.uk/development_of_minewarfare.htm: "The first known use of an acoustic mine occurred in 1940. However work on an acoustic countermeasure had already been initiated by HMS Vernon and the Sweeping Division of its Mine Design Department. This resulted in the SA acoustic hammer box in the bow compartment of a vessel (usually a converted trawler) but later bow-mounted about 12 feet below the water. By 1942, the bow mounted hammer box was one of the most common acoustic countermeasures and was being streamed abeam, usually in combination with the LL magnetic sweep. The hammer boxes contained a pneumatic or electric driven riveting hammer mounted to strike against a 7/16 inch thick 19 inch diameter steel diaphragm. The pneumatic hammers proved more reliable than the electric type and were incorporated into the standard hammer box designated 'A Mark 1' which was either suspended over the bow of a minesweeper or towed in combination with the magnetic sweep"
1 January 2021, 11:34
