Friday 21 November 08 - 09:05
 

Diving & Underwater Services

Deep dive wing development rewarded

One of the problems in towing an instrument underwater is the long length of cable required to get the device down to depth. JW Fishers have developed a universal wing called the DDW-1 Deep Dive Wing to help overcome this problem.
Deploying the DDW-1 deep dive wing.
Deploying the DDW-1 deep dive wing.

A typical ratio of cable length to tow depth is 4 to 1, which means 400 feet of cable is required to tow at a depth of 100 feet. If the tow speed is increased then even more cable is needed to get to depth. To overcome this problem a depressor wing is used. With the wing, the ratio is cut in half which means the equipment can be towed at a depth of 100 feet using only 200 feet of cable. The advantages are no more piles of cable on the boat deck and that smaller, less expensive cable handling systems can be used.

In the past, many of these depressors were custom made to fit specific equipment. This meant the wings were expensive and had limited applications. JW Fishers saw the solution to these problems as a universal wing that could be used with any type of equipment and developed the DDW-1 deep dive wing. The DDW is assisting a variety of users from government agencies and universities, to police departments and marine service companies.

Government groups using the wing include the U.S. National Marine Fisheries Service and the Argentine Navy. Institutions of higher education employing this device extend from the University of South Carolina to the University of Alaska. Also using the DDW-1 are marine services such as Ireland's Korec Group and privately owned civil engineering companies like Isreal’s Merterre.

Taking advantage of the wing’s diving ability is a broad range of equipment in a variety of applications. The Fisheries Service is using their wing in conjunction with the TOV-1 towed underwater camera system to survey reefs and other marine ecosystems. The Argentine Navy and Varna Diving Company in Bulgaria both use their wings with a proton magnetometer to search for sunken vessels. One of the most interesting projects involving the deep dive wing is the search for a historic shipwreck being undertaken on the north east coast of England. A consortium made up of members from the Filey Town Council and the Filey Underwater Research unit are using the wing with an underwater metal detector in a hunt for the remains of the American warship USS Bonhomme Richard, which sank off Flamborough Head, Yorkshire UK in 1779 after defeating and capturing the British warship HMS Serapis.

Images for this article - click to enlarge

Deploying the DDW-1 deep dive wing.

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