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tation of merchandise between U.S. points on any vessel other than one built in and documented un- der the laws, and owned by citi- zens, of the United States. Al- though this particular statute dates only from 1920, similar statutes date from the early 1800s. The pa- per tracks the history of the re- quirement that U.S. vessels en- gaged 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 re- quirement for such vessels has been abolished in the foreign but maintained in the domestic trades. It also follows the rise of compet- ing land modes of transportation, which have no similar require- ment 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 ves- sels 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 investi- gates the performance of a fixed- pitch propeller/diesel engine sys- tem as a function of propeller de- sign definitions and time in serv- ice. The hull roughness, propeller smoothness, and environmental factors are taken into considera- tion for analyzing changes in pro- peller open-water efficiency, pro- pulsion components, resistance, and consequently, propeller power absorption. Paper No. 7. "Sea-Land's D9 Con- tainer Ships—Design, Construc- tion and Performance" by R.J. Baumler, Toshio Watanabe and Hiroshi Huzimura. SYNOPSIS—In October of 1978 Sea-Land contracted for 12 diesel- powered 1678 TEU container ves- sels for delivery in 1980. This pa- per briefly explores the back- ground behind this construction decision, reviews the engineering studies, and discusses the bidding and contract requirements. It also describes the major design fea- tures, evaluates the construction schedule and quality control pro- cess, and finally summarizes the actual vessel performance. Paper No. 8. "A Study of Drag Coefficients for Truss Legs on Self- Elevating Mobile Offshore Drill- ing Units" by N. Pharr Smith, David B. Lorenz, Carl A. Wen- denburg and John S. Laird II. SYNOPSIS—The accurate pre- diction of drag coefficients for truss- type jackup legs is important not TECHNICAL MEETING SCHEDULE THURSDAY TRIANON MERCURY 9:00 1. Computer Program for Recreational Powerboats Calkins 3. Revival of Flettner Rotors . . . Williams/Liljenberg 10:30 2. Design & Construction of 25-M High-Speed Yacht Lalangas/Yannoulis 4. Ultimate Strength of Ship Structures Che n/Ku tt/Pi aszczy k/ B i en i e k 12:00 PRESIDENT'S LUNCHEON Grand Ballroom Reception, East Ballroom Foyer 2:00 BUSINESS SESSION Grand Ballroom 2:30 3:30 5. The Jones Act: Foreign-Built Vessels and the Domestic Shipping Industry Leback/McConnell, Jr FRIDAY TRIANON MERCURY 9:00 6. Effects of Propeller Design Point Definition . . . Kresic/Haskell 8. Drag Coefficients for Truss Legs on Offshore Drilling Units Smith/Lorenz/Wendenburg/Laird II 10:30 7. Sea-Land's D9 Container Ships .. . Baumler/Watanabe/Huzimura 9. Conceptual Design Process of Tension Leg Platform Chou/Ghosh/Huang 12:00 2:00 2:30 10. Salvage Engineering Using Portable Computers Porricelli/Boyd/Schleitfer 12. Design for Adequate Ship Maneuverability Landsburg/Card/Crane, Jr. Alman/ Bertsche/Boylston/Eda/Keith/ McCallum/Miller, Jr./Taplin 3:30 4:00 11. Predicting Ship Performance in Level Ice Kotras/Baird/Naegle 5:00 7:00 7:30 8:30 91st ANNUAL BANQUET Grand Ballroom only for the rig's structural design but also for the analysis of vessel stability. This paper outlines a se- ries of wind tunnel tests per- formed on truss legs and compares the test results with the value ob- tained from some of the classifica- tion society rules. An improved "building block" method is pro- posed, and several examples are provided. Paper No. 9. "Conceptual Design Process of a Tension-Leg Plat- form" by Frank S.F. Chou, Su- sobhan Ghosh and Edward W. Huang. SYNOPSIS—This paper pre- sents a conceptual design process of a tension-leg platform (TLP) with optimization of its perform- ance as the primary consideration. Guidelines for the preliminary es- timation of various important pa- rameters are suggested for the de- signer's use. Paper No. 10. "Modern Analyti- cal Techniques for Salvage Engi- neering Using Portable Com- puters" by J.D. Porricelli, J. Huntly Boyd and Keith E. Schleiffer SYNOPSIS—This paper demon- strates a series of analytical tech- niques developed for use within a portable computer by marine sal- vors in a stranding situation. The techniques provide improved esti- mation processes for the salvor (continued from page 58) GLACIER-PILGRIM NON-POLLUTING STERNGEAR SYSTEMS i \ SELECTED FOR 12 UNITED STATES LINES CONTAINER SHIPS BUILDING AT DAEWOO SHIPBUILDING LTD. Eliminate costly penalties for maritime pollution by specifying Glacier-Pilgrim "COASTGUARD" Sterngear Systems/ TO FIND OUT HOW: PHONE, TELEX OR WRITE for free descriptive literature MAPECO PRODUCTS, INC.