February 1977 - Maritime Reporter and Engineering News

Graduate Students Present Papers To SNAME New England Section

The New England Section of The Society of Naval Architects and Marine Engineers recently met at Valles Steak House in Newton, Mass., to hear the presentation of two excellent student papers. Forty-five members gathered for the occasion.

Following cocktails and dinner, the technical meeting was opened by the chairman of the Section, John P. Casey, who introduced the first author, Jay Carson, who is currently a graduate student at M.I.T. His paper was entitled "Sailing Bulk Carrier Design." In it, he addresses the preliminary design of a series of large square-rigged steel sailing ships. Primary emphasis is on a choice of hull parameters rather than sail design. His analysis showed that for a limiting draft of 34 feet, the maximum feasible deadweight would be 32,300 dwt. The effect of cargo density on stability is shown to be a limiting factor in choosing feasible trades for such a vessel.

The second author, Lt. Comdr. Richard Hamly, presented his paper, "An Analysis of Wave Drag." He recently received his Master of Science degree in naval architecture from M.I.T. Using the Taylor Standard Series as a data base, this paper introduces regression analysis techniques as a means to develop a universal wave drag function of only one variable for each speed length ratio. Using the prediction formula developed, the results compared quite well to Gertler's reanalysis of the Taylor Standard Series. Similar comparisons are made for several models which are unlike the Taylor Series parent, with individual towing tank results. Differences and sources of error are discussed.

Copies of the papers are available from Lt. Comdr. James A. Sanial, USCG, Department of Engineering, U.S. Coast Guard Academy, New London, Conn. 06370.

Other stories from February 1977 issue


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