91st S N A ME Annual Meeting Second International Maritime Exposition

The Society of Naval Architects and Marine Engineers will hold its Annual Meeting, the 91st, in conjunction with an expanded International Maritime Exposition at the New York Hilton Hotel on November 9-12, 1983.

The Technical Program promises to be outstanding with presentations of 12 technical papers in the Trianon and Mercury Ballrooms.

Subjects range from computer programs through ship systems and descriptions to a paper on the history of The Jones Act.

Last year's Exposition was so well received and so successful that for 1983 it has been expanded in both size and scope. Exhibiting will be 139 companies occupying more than 22,000 square feet of exhibit space on the second floor of the hotel.

Last year, all exhibit space was fully booked at a very early date and when the exposition opened there was a long and impressive waiting list of leading firms hoping for last minute cancellations.

Again this year, although the exhibit area has been substantially enlarged, a tremendous growth in interest in this premier marine trade show has resulted in another waiting list. Again, marine products and services of all types will be demonstrated and displayed before one of the most distinguished and influential audiences ever assembled at any marine exhibition.

Over 3,000 of these important individuals attended last year's show.

In an informal survey conducted at last year's exposition by Maritime Reporter, almost all exhibitors stated the SNAME Show was the most successful and productive in their experience.

Registration for the Annual Meeting entitles the registrant to free admission to the Exposition at any time it is open. Non-registrants to the Society's Technical Sessions may obtain daily admission tickets at the Exposition Registration Desk at $7.00 each. The Exposition hours will be: Wednesday, November 9, from 2 pm to 6 pm; Thursday, November 10, from 10 am to 6 pm, and Friday, November 11, from 10 am to 4 pm.

The Annual Business Session will immediately follow the President's Luncheon in the Grand Ballroom at 2 pm on Thursday, November 10. The agenda for this meeting will include a report of the elections which occurred at the Council Meeting on Wednesday, November 9, consideration of proposed amendments to the Bylaws and such other business as may be introduced by the chair. Society President C.L. French will preside at this meeting as well as at othe^ functions.

Special breakfasts (by invitation only) will be held. Authors, presiding officers and assistant presiding officers will meet at breakfasts on the days of their sessions at 7:30 am on Thursday in Suite 524 and on Friday in Suite 520. The Society's Membership Committee will meet for breakfast at 7:30 am on Thursday in Suite 520. The Sections Committee will meet for breakfast at 7:30 am on Friday in Suite 517.

Society President, Mr. French, will make his annual address at the President's Luncheon on Thursday, November 10. Featured on the program will be the presentation of several important awards.

The 91st Annual Banquet, open to members and guests will take place at 7:30 pm on Friday, November 11, in the Grand Ballroom.

Featured on the Banquet program will be the presentation of the Society's top awards. The David W. Taylor Medal "for notable achievement in marine engineering" will be awarded to Jens T. Holm, retired professor of marine engineering, Webb Institute of Naval Architecture. The Vice Admiral "Jerry" Land Medal "for outstanding accomplishment in the marine field" will be given to Edwin M. Hood, president emeritus of, and consultant to the Shipbuilders Council of America. Finally, Joe W. Key, maritime consultant of Houston, Texas, will receive the Blakely Smith Medal "for outstanding accomplishment in ocean engineering." After the bestowing of these awards, Mr. French will introduce the main speaker of the evening, Ralph L. Lewis Jr., retired vice president of Gulf Oil Corpo- ration and corporate communications coordinator for Gulf.

The final affair of the Annual Meeting will be the Dinner Dance to be held on Saturday evening.

The reception will be held in the Grand Ballroom Foyer, starting at 7:00 pm, followed at 8:30 pm with dinner in the Grand Ballroom.

Music for dancing will be provided by Steven Scott Productions under the direction of Stuart White.

A ladies' hospitality room will be located in Suite 524/526 and will be open from 9:00 am to 4:00 pm Thursday and Friday. Information on places to visit and interesting things to do in New York City will be available as well as maps, brochures and other helpful suggestions. Also a tour has been planned for spouses for Friday from 9:30 am to 2:00 pm. This tour will include a visit to Decorating & Design Showroom * Private Home and lunch at the Tavern on the Green.

Technical Papers (See table for time and place.) Paper No. 1. "An Interactive Computer-Aided Design Synthesis Program for Recreational Powerboats" by D.E. Calkins.

SYNOPSIS—A computer program based on the design spiral concept has been developed for recreational powerboat design synthesis. The program combines conversational input with graphical output, which allows the designer to communicate with the program in an interactive mode.

The program is based on 10 design and analysis technology modules, including configuration initialization, hull architecture, mass properties, hydrostatics, hydrodynamics, propulsion, performance, dynamic stability and response, structural design and operating economics.

Paper No. 2. "Design and Construction of a 25-M High-Speed Aluminum Motor Yacht" by Petros A. Lalangas and Panayiotis L. Yannoulis.

SYNOPSIS—This paper presents the design, construction and performance of a 25-m (82-foot), 32-knot, all-aluminum, luxury motor yacht. Model resistance and seakeeping data are given and compared with other efficient planing hull forms. The design of bottom structure, details on outfitting materials and weights, and noise abatement treatments are also discussed. Actual trial results and noise measurements are shown and compared with those of other planing craft.

Paper No. 3. "Revival of the Flettner Rotor—Beneficial or Not for Merchant Vessels, Fishing Boats and Recreational Craft" by Ake Williams and Hans Liljenberg.

SYNOPSIS—Experiments have been carried out at the Swedish Maritime Research Centre (SSPA) aiming at rotor-powered merchant vessels, fishing boats and recreational craft. Wind tunnel tests were performed to compare rotor and sail propulsion of a coaster of 950 tons deadweight. Complementary "half-scale" tests at sea were carried out by use of a 6-m (20- foot) rotor-equipped test boat.

Paper No. 4. "Ultimate Strength of Ship Structures" by Yung- Kuang Chen, Lembit M. Kutt, Christopher M. Piaszczk and Maciej P. Bieniek.

SYNOPSIS—Described in this paper is a method of analysis of the ultimate strength, as well as the total response, of ship structures subjected to static or dynamic loads. The analysis takes into account elasto-plastic properties of the material, geometrically nonlinear behavior of the elements and their buckling and postbuckling strength. The finite element based approach is applicable to individual structural components of a ship and to the hull girder as a whole. Selected applications to typical ship structural problems are presented.

Paper No. 5. "The Jones Act: Foreign- Built Vessels and the Domestic Shipping Industry" by Warren G. Leback and John W. Mc- Connell Jr.

SYNOPSIS—Section 27 of the Jones Act prohibits the transporilaval tation of merchandise between U.S.

points on any vessel other than one built in and documented under the laws, and owned by citizens, of the United States. Although this particular statute dates only from 1920, similar statutes date from the early 1800s. The paper tracks the history of the requirement that U.S. vessels engaged in the U.S. foreign and domestic trade must be not only owned by citizens of the U.S. but built in the U.S., and how this requirement for such vessels has been abolished in the foreign but maintained in the domestic trades.

It also follows the rise of competing land modes of transportation, which have no similar requirement as to the equipment used by them, and the decline, and almost total demise, of domestic ocean shipping. It recommends abolition of the requirement that such vessels be built in the United States as a possible means of restoring domestic ocean shipping.

Paper No. 6. "Effects of Propeller Design Point Definition on the Performance of a Propeller/Diesel Engine System with Regard to In- Service Roughness and Weather Conditions" by Miro Kresic and Bruce Haskell.

SYNOPSIS—This paper investigates the performance of a fixedpitch propeller/diesel engine system as a function of propeller design definitions and time in service.

The hull roughness, propeller smoothness, and environmental factors are taken into consideration for analyzing changes in propeller open-water efficiency, propulsion components, resistance, and consequently, propeller power absorption.

Paper No. 7. "Sea-Land's D9 Container Ships—Design, Construction and Performance" by R.J.

Baumler, Toshio Watanabe and Hiroshi Huzimura.

SYNOPSIS—In October of 1978 Sea-Land contracted for 12 dieselpowered 1678 TEU container vessels for delivery in 1980. This paper briefly explores the background behind this construction decision, reviews the engineering studies, and discusses the bidding and contract requirements. It also describes the major design features, evaluates the construction schedule and quality control process, and finally summarizes the actual vessel performance.

Paper No. 8. "A Study of Drag Coefficients for Truss Legs on Self- Elevating Mobile Offshore Drilling Units" by N. Pharr Smith, David B. Lorenz, Carl A. Wendenburg and John S. Laird II.

SYNOPSIS—The accurate prediction of drag coefficients for trusstype jackup legs is important not only for the rig's structural design but also for the analysis of vessel stability. This paper outlines a series of wind tunnel tests performed on truss legs and compares the test results with the value obtained from some of the classification society rules. An improved "building block" method is proposed, and several examples are provided.

Paper No. 9. "Conceptual Design Process of a Tension-Leg Platform" by Frank S.F. Chou, Susobhan Ghosh and Edward W.

Huang.

SYNOPSIS—This paper presents a conceptual design process of a tension-leg platform (TLP) with optimization of its performance as the primary consideration.

Guidelines for the preliminary estimation of various important parameters are suggested for the designer's use.

Paper No. 10. "Modern Analytical Techniques for Salvage Engineering Using Portable Computers" by J.D. Porricelli, J.

Huntly Boyd and Keith E.

Schleiffer SYNOPSIS—This paper demonstrates a series of analytical techniques developed for use within a portable computer by marine salvors in a stranding situation. The techniques provide improved estimation processes for the salvor and permit him to better formulate his salvage strategy at an early stage. Many of the techniques also provide new and updated data and methods for use by naval architects in preliminary ship design.

Paper No. 11. "Predicting Ship Performance in Level Ice" by Thomas V. Kotras, Andrew V.

Baird and John N. Naegle.

SYNOPSIS—Presented in this paper is an analytical model to aid designers in estimating a ship's performance in level ice as a function of size, major hull characteristics and hull geometry. Included is correlation of the model predictions with full-scale ice trials data for seven icebreaking ships, ranging in size and hull shape from an icebreaking tug to an icebreaking tanker.

Paper No. 12. "Design and Verification for Adequate Ship Maneu- verability" by Alexander C.

Landsburg, James C. Card, C.

Lincoln Crane Jr., Philip R. Alman, William R. Bertsche, John W. Boylston, Haruzo Eda, Virgil F. Keith, Ian R. McCallum, Eugene R. Miller Jr. and Abraham Taplin.

SYNOPSIS—SNAME Panel H- 10 (Ship Controllability) has reanalyzed what constitutes a good maneuvering vessel and how to achieve it. An extensive data base of trials results is presented, plus surveys of pilot performances and usual designer practice. Regulatory proposals currently under review nationally and internationally are discussed. Design tools to assure desired inherent maneuverability are outlined along with trial agendas for verification.