Please select your home edition
Edition
InSunSport - International - GR

Shanghai to San Francisco in under 2 hours via supersonic sub

by Stephen Chen on 30 Aug 2014
. .
China has edged a step closer to creating a supersonic submarine that could travel from Shanghai to San Francisco in under two hours and this technolgy could find its way into racing yachts. It has nothing to do with cruising whatsoever, its just an interesting read.

New technology developed by a team of scientists at Harbin Institute of Technology's Complex Flow and Heat Transfer Lab has made it easier for a submarine, or torpedo, to travel at extremely high speeds underwater.

Li Fengchen, professor of fluid machinery and engineering, said the team's innovative approach meant they could now create the complicated air 'bubble' required for rapid underwater travel. 'We are very excited by its potential,' he said.

Water produces more friction, or drag, on an object than air, which means conventional submarines cannot travel as fast as an aircraft.

However, during the cold war, the Soviet military developed a technology called supercavitation, which involves enveloping a submerged vessel inside an air bubble to avoid problems caused by water drag.

A Soviet supercavitation torpedo called Shakval was able to reach a speed of 370km/h or more - much faster than any other conventional torpedoes.

Some years ago Australian Sean Langman set out to build a world speed record sailing craft using this technogy, with design work done by Andy Dovell, of Murray, Burns, Dovell . The project did not proceed but the application was recognised.

In theory, a supercavitating vessel could reach the speed of sound underwater, or about 5,800km/h, which would reduce the journey time for a transatlantic underwater cruise to less than an hour, and for a transpacific journey to about 100 minutes, according to a report by California Institute of Technology in 2001.

However, supercavitation technology has faced two major problems. First, the submerged vessel has needed to be launched at high speeds, approaching 100km/h, to generate and maintain the air bubble.

Second, it is extremely difficult - if not impossible - to steer the vessel using conventional mechanisms, such as a rudder, which are inside the bubble without any direct contact with water.

As a result, its application has been limited to unmanned vessels, such as torpedoes, but nearly all of these torpedoes were fired in a straight line because they had limited ability to turn.

Li said the team of Chinese scientists had found an innovative means of addressing both Read the full story

Ancasta Ker 40+ 660x82Southern Spars - 100Zhik Isotak Ocean 660x82

Related Articles

Olympic Gold medalist and Volvo Ocean Race winner up for WS Board
Torben Grael (BRA) is amongst the 15 nominations for one of seven places on the Board of Directors of World Sailing Torben Grael (BRA) is amongst the 15 nominations for one of seven places on the Board of Directors of World Sailing in November. The five times Olympic medalist, Volvo Ocean Race winner and several times America's Cup competitor will bring a much needed sailing edge to the Board of World Sailing if he can navigate the politics of the controlling body of the sport.
Posted on 25 Sep
D-Marin Farr 40 Zadar Regatta – Overall report
Enfant Terrible and Plenty have been doing battle on the Farr 40 International Circuit for several years now. Enfant Terrible and Plenty have been doing battle on the Farr 40 International Circuit for several years now. Those two top-notch programs have resumed their rivalry this week in the waters off this historic city along the Dalmatian coast.
Posted on 23 Sep
Impressive tow-in freestyle show on the water in Cold Hawaii
The second day of the netIP Cold Hawaii PWA World Cup proved to be yet another lay day for the main competitio The second day of the netIP Cold Hawaii PWA World Cup proved to be yet another lay day for the main competition as expected with light winds and small waves.
Posted on 21 Sep
Brookes and Gatehouse Videos with Knut Frostad
Navico, the parent company for Brookes and Gatehouse (B&G), Simrad and Lowrance have prepared some terrific videos Navico, the parent company for Brookes and Gatehouse (B&G), Simrad and Lowrance have prepared some terrific videos with Knut Frostad, the legendary Volvo Ocean Race sailor and former CEO. See him talk about sailing in general, the B&G product choices and placement he made for his own boat, and then why he loves his Outremer 5X.
Posted on 8 Sep
Soft Padeyes – light, strong and versatile
Several types of soft padeyes are now available and are proving increasingly popular over traditional stainless steel pa Several types of soft padeyes are now available on the market and are proving increasingly popular over traditional stainless steel padeyes. They all capitalise on the incredible strength to weight ratio and abrasion resistance of Dyneema® which offers a reliable, robust, flexible and safe termination.
Posted on 6 Sep
The hurricanes headed for Hawaii and Florida
The National Weather Service has upgraded a tropical storm headed for Florida to hurricane status. The National Weather Service has upgraded a tropical storm headed for Florida to hurricane status. The first of two hurricanes headed toward Hawaii lost strength and was downgraded to a tropical storm. Meanwhile, in Florida, a tropical storm gained in strength and is now designated as a hurricane.
Posted on 4 Sep
Zhik sailors win 17 sailing medals at 2016 Olympic Regatta
The 2016 Olympic games are over and what a Games they have been - Zhik sailors dominated Zhik sailors won almost 60% of the medals contested at Rio de Janeiro. It was a regatta which tested sailors and gear - with one day being the most severe conditions ever experienced at an Olympic regatta. For the Zhik team riders on the waters of Rio, four years and more of hard work and dedication have paid off for many.
Posted on 29 Aug
Kids Polarised Sunglasses from Barz Optics
Barz Optics have developed a quality range of junior polarised sunglasses ideal for sailing and fishing. Barz Optics have developed a quality range of junior polarised sunglasses ideal for sailing and fishing. Each pair are supplied with a neoprene case and sunglass retainer.
Posted on 4 Aug
Reducing weight aloft with composite backstays
Reducing weight aloft is one of the most cost effective ways of increasing your boat speed and performance. Reducing weight aloft is one of the most cost effective ways of increasing your boat speed and performance. Every kilogram you take out of the rig is roughly equivalent to 4kg added to the bottom of your keel!
Posted on 26 Jul
Free $US3,000 Carbon Vang with SouthernFurl boom orders in July
Southern Spars is giving a free carbon vang - valued at US$3,000 - with SouthernFurl in-boom furlers ordered in July Southern Spars is giving away a free carbon vang - valued at US$3,000 - with all of their SouthernFurl in-boom furlers ordered in July. Carbon gas vangs make a great addition to the furling boom package, though if you’d prefer to keep your existing one, Southern Spars will offer you a 5% discount on the price of your boom instead.
Posted on 29 Jun