{"id":153442,"date":"2024-02-20T07:00:14","date_gmt":"2024-02-20T12:00:14","guid":{"rendered":"https:\/\/valorguardians.com\/blog\/?p=153442"},"modified":"2024-02-19T13:47:52","modified_gmt":"2024-02-19T18:47:52","slug":"supersonic-underwater","status":"publish","type":"post","link":"https:\/\/www.azuse.cloud\/?p=153442","title":{"rendered":"Supersonic – underwater?"},"content":{"rendered":"

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No, we are not referring to the finances of the SST – multiple news reports say the U.S. Navy is doing research on a super-sonic submarine.<\/p>\n

The sleek jet is expected to play an instrumental role in bringing back supersonic commercial air travel. But what if I tell you that researchers are working on a submarine that could travel more than three times faster than the X-59 jet?<\/p>\n

But there\u2019s a simple solution to overcome drag underwater \u2013 a bubble. The researchers are working on a technology called supercavitation that envelopes a submerged vessel inside an air bubble to mitigate drag. You\u2019ll be surprised that the technology is not new. The Soviets developed it during the Cold War era for a torpedo named Shakval. The Soviet torpedo reached a speed of 370km\/h (around 230mph), making it a lot faster than any other conventional torpedo.<\/p>\n

In theory, the technology can help the submarine hit supersonic speed underwater, or about 5,800km\/h (~3600mph). If developed, the supersonic submarine would cut down the journey time from New York to London to just 50 minutes. Furthermore, the 5300-mile distance between San Francisco and Tokyo will be covered in 90 minutes by the radical submarine. Luxury Launches.com<\/a><\/p><\/blockquote>\n

Sounds incredible. I would point out that ‘supersonic’ is a slippery term, as sound travels ‘WAY faster in salt water than in air, and the speed\u00a0 is far more variable.<\/p>\n

In the oceans the speed of sound varies between 1,450 and 1,570 metres (about 4,760 to 5,150 feet) per second. It increases about 4.5 metres (about 15 feet) per second per each 1 \u00b0C increase in temperature and 1.3 metres (about 4 feet) per second per each 1 psu increase in salinity.\u00a0 Britannica.com<\/a><\/p><\/blockquote>\n

So, depending on depth, temperature etc. that 3600mph may or may not be supersonic in water. Either way, it’s interesting to think a sub could go faster than a plane.<\/p>\n

Now, so far, this is somewhat theoretical – the pic below is of a “second order supercavity” in a 12″ wide tank. Note the best the Russian torpedo hit was about 10% of the speed of sound, equivalent to about 100mph in the air.<\/p>\n

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Both China and the US are working on this, and no doubt the Russians have continued their work.\u00a0 One suspects the actual usage of such a drive would be very noisy and I am sure a whale strike would be catastrophic. I am willing to stick my neck out and say we will see this appear first in faster torpedoes, not submarines. Maybe some of you folks with more knowledge that I – almost everyone – can shed more light on it?<\/p>\n

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  No, we are not referring to the finances of the SST – multiple news reports … Supersonic – underwater?<\/span>Read more<\/a><\/p>\n","protected":false},"author":668,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119,503],"tags":[],"class_list":["post-153442","post","type-post","status-publish","format-standard","hentry","category-navy","category-science-and-technology"],"_links":{"self":[{"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=\/wp\/v2\/posts\/153442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=\/wp\/v2\/users\/668"}],"replies":[{"embeddable":true,"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=153442"}],"version-history":[{"count":0,"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=\/wp\/v2\/posts\/153442\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=153442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=153442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.azuse.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=153442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}