Page 20: of Maritime Reporter Magazine (May 15, 1981)

- 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:.