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- A PREVIEW - PROPELLERS '81 VIRGINIA BEACH — MAY 26-27 The third in a series of inter- national symposia on ship pro- pellers that have been attracting wide attention in the marine en- gineering community in recent years will be presented on May 26- 27, 1981, at the Cavalier Hotel, Virginia Beach, Va. Titled Pro- pellers '81, the meeting is being presented by the Technical and Research Program of The Society of Naval Architects and Marine Engineers in cooperation with the Hampton Roads Section. A total of 24 papers on various aspects of marine propellers and related propulsion components are scheduled for delivery at the symposium, the authors repre- senting a cross section of exper- tise from the United States and Europe. Propellers '81 is intended to: • Encourage vitally needed re- search efforts through the pres- entation and publication of the most recent developments in hy- drodynamic theories of propeller design and wake interaction, and present the most up-to-date in- formation available on the prob- lem of propeller wake-induced vi- bration. • Provide a forum for the dis- cussion of the special problems associated with the operation of fixed- and variable-pitch propel- lers in ice, with an in-depth study of Ice Class Rules as they per- tain to propeller design param- eters. • Disseminate propeller design information for a wide range of small craft. • Give an opportunity for a free exchange of views between members of the marine commu- nity as to the present state of propeller design, performance, maintenance procedures, and the economic gains resulting from them. Robert P. Giblon, chairman of the Ships' Machinery Committee, is general chairman of Propellers '81; Andrew A. Szvpula is chair- man of the Technical Committee, which is made up of the members of Panel M-16 (Modernization of Propulsion Shaft Systems) of SNAME. A banquet will be held on Tues- day, May 26, at 7:00 pm. The principal speaker will be John J. Nachtsheim (FL '54), 33rd pres- ident of the Society, 1981-82. At the time of his election, he was assistant administrator for ship- building and ship operations, Mar- itime Administration. In Decem- ber 1980 Mr. Nachtsheim assumed the position of executive director, Maritime Transportation Re- search Board of the National Academy of Sciences. TECHNICAL PROGRAM TUESDAY, MAY 26 Session 1A — Hydrodynamics. Presiding: John G. Hill; assist- ing: Brendt Hansen. 9:45 am The Flowfield near the Propeller of a Self-Propelled Slen- der Body with Appendages: J.A. Schetz and H.P. Stottmeister. 10:50 am Semi-Submerged Pro- pellers for Monohull Displacement Ships: D.A. Rains. 11:35 am The Pinnate Propeller: P. Simonsson. Session IB — Ice. Presiding: Frank Zaher; assisting: Watt V. Smith. 9:45 am A Study of Ice Class Rules for Propellers: P.G. Noble and V. Bulat. 10:50 am Design of Baltic Fer- ries for the Eighties — Propeller and Aft End Vibrations: R. Sal- minen and M. Kanerva. 11:35 am Full Scale Icebreaking Stresses on Propellers of the Po- lar Star: G. Antonides, A. Hagen, and I). Langrock. Session 2A — Small Boats. Pre- siding: Robert A. Levine; assist- ing: Robert A. Giuffra. 2:15 pm Sizing Segmental Sec- tion— Commercially Available Propellers for Small Craft: D.L. Blount and E.N. Hubble. 3:00 pm Simplified Plotting of Nondimensional Propeller Param- eters and its Application to a Propeller Series for High-Speed Small Craft: H.F. Hillman. 4:05 pm Propulsion Systems for Slow Amphibians: J.C. Daidola, H. Hui-tzeng Ting, and E.D. Wolfe. Session 2B — Vibrations. Presid- ing: Angelos Zaloumis; assisting: John A. Albino. 2:15 pm Investigation into Mod- eling and Measurement of Pro- peller Cavitation Source Strength at Blade Rate on Merchant Ves- sels : L.M. Grey. 3:00 pm Periodic Blade Loads on Propellers in Tangential and Longitudinal Wakes: R.J. Bos- well, S.D. Jessup, and K.H. Kim. 4:05 pm Minimization of Un- steady Propeller Forces that Ex- cite Vibration of the Propulsion System: N.A. Brown. WEDNESDAY, MAY 27 Session 3A — Hydrodynamics. Presiding: Francis J. Dashnaw; assisting: Robert A. Levine. 9:15 am The Influence of the Propeller on the Wake Distribu- tion as Established in a Model Test: J. Laudan. 10:20 am On Optimum Propel- ler Performance: T.A. Loukakis and G. Politis. 11:05 am Prediction of Propel- ler Hydrodynamic Coefficients Using Unsteady Lifting Surface Theory: L. Vassilopoulos and M. Triantafyllou. Session 3B—Vibrations. Presid- ing: John E. Ancarrow Jr.; as- sisting: Robert H. Murray. 9:15 am Added Mass and Damp- ing Estimates for Vibrating Pro- pellers: M.G. Parsons and W.S. Vorus. 10:20 am Propeller Induced Noise in Ships: A.C. Nilsson, B. Persson, and N.P. Tyvand. 11:05 am Propeller Tip Vortex Cavitation Noise Inception: R. Latorre. Session 4A — Hydrodynamics. Presiding: George W. Morris; as- sisting: John G. Hill. 1:45 pm Lifting-Line Theory for a Supercavitating Unsteady Hy- drofoil as a Singular Perturbation Problem: J. Pylkkanen. 2:30 pm Lifting Surface Hydro- dynamics for Design of Rotating Blades: T. Brockett. 3:35 pm Propeller Design Opti- mization—An Integral Theoreti- cal and Experimental Procedure: F. Bau, G. Bellone, B. Chilo, and A. Columbo. Session 4B — Conditions. Presid- ing: Paul E. Speicher Jr.; assist- ing: Jan Karlsen. 1:45 pm Evaluation of Selected Lip Seals/Liners for Propulsion Shafts of Merchant Ships: L.W. Winn and F.J. Dashnaw. 2:30 pm Timing of Drydocking Intervals to Most Economical Ef- fect: F. Prochaska. 3:35 pm An Integral Prediction Method for Three-Dimensional Turbulent Boundary Layers on Rotating Blades: N.C. Groves. 4:25 pm Concluding remarks. For further information on Propellers '81, contact Trevor Lewis-Jones, manager, publica- tions and technical programs, SNAME, One World Trade Cen- ter, Suite 1369, New York, N.Y. 10048; (212) 432-0310. 22 Maritime Reporter/Engineering New:.
