Page 15: of Maritime Reporter Magazine (November 1981)

89th SNAME

Annual Meeting —A Preview (continued from page 12) speed and endurance; type and number of helicopters carried, and choice of weapons system and their associated electronics.

Effects of these and other "major drivers" are illustrated by using variants of FFG 7.

Paper No. 6. "Dynamics and

Hydrodynamics of Surface-Effect

Ships" by Paul Kaplan, James

Bentson and Sydney Davis.

SYNOPSIS —A description is given of the importance of dy- namics problems and their influ- ence on performance and design of surface-effect ships (SES).

Problems of scaling model mo- tions, as well as relations between analysis and test data, are de- scribed for seakeeping, maneu- verability and control require- ments for this class of ship. Cor- relation between theory and ex- periment is provided as the basis of using computer simulation pre- dictions for full-scale design of large SES craft.

Paper No. 7. "Application of Plas- tic Analysis to U.S. Coast Guard

Icebreaker Shell Plating" by Rich- ard Chiu, Eugene Haciski and

Paul Hirsimaki.

SYNOPSIS—This paper applies plastic analysis to icebreaker shell plating by two methods: idealized three-hinge plastic anal- ysis, and non-linear finite element study. Past U.S. Coast Guard ice- breaker structural design prac- tice is reviewed and damage his- tories are discussed. Based on the two approaches to plasticity, a design method relating perma- nent set-in-steel icebelt plating to panel loading is presented.

Paper No. 8. "Application of a

Computer-Aided, Optimal Prelim- inary Ship Structural Design

Method" by Donald Liu, Owen

Hughes and John Mahowald.

SYNOPSIS—The authors pre- sent the capabilities of the SHIP-

OPT computer program for use in assessing overall structural adequacy and/or developing pre- liminary ship structural designs, which are optimal in terms of a user specified objective such as least initial cost. The general pro- gram philosophy is discussed and two design examples are given: a segregated ballast tanker, and a double-bottom bulk carrier.

Paper No. 9. "Estimating the

Technical and Economic Penalties of Hull and Propeller Roughness" by Robert L. Townsin, David

Byrne, Tor E. Svensen and Alex

Milne.

SYNOPSIS — The monitored speed-power performance of two containerships are interpreted in terms of their roughness histor- ies. Hull surface damage pen- alties and texture parameters are discussed, a code of practice for hull surface measurements and presentation is offered. Propeller roughness measurements are pro- vided with the calculation of drag increase effects. A techno-eco- nomic model of the containerships provides economic comparisons between various bottom mainte- nance schemes.

Paper No. 10. "Development and

Full-Scale Experiences of a Novel

Integrated Duct Propeller" by

H. Narita, H. Yagi. H.D. Johnson and L.R. Breves.

SYNOPSIS—A new propulsion system, the Mitsui Integrated

Duct Propeller (MIDP), has been developed for reducing fuel con- sumption. The MIDP utilizes a duct mounted forward of the pro- peller. The MIDP hydrodynamic features and trial results of the 250,000-dwt tanker Esso Copen- hagen with and without MIDP are described in this paper. Also (continued on page 16)

WE'RE EXPECTING

A NEW ARRIVAL

A new steel "super" dry dock will arrive at the Galveston Division of Todd

Shipyards Corporation early in 1982, to service ships of almost all sizes and types including offshore drill rigs.

The new arrival will be 853 ft. long and 164 ft. between wingwalls, with a lifting capacity of approximately 40,000 tons for ships up to 225,000 dwt. It will be equipped with four travelling dock arms fitted for high pressure waterblasting; two wingwall cranes, each with 35 ton lifting capacity; and such pollution control features as oily water tanks, sewage treatment plant and a flush pontoon deck.

The huge dry dock, to be named "BIG

T" and the largest in the Gulf area devoted exclusively to ship repair, will be ready to serve our customers in April of 1982.

Todd Shipyards Corporation, the largest independent shipbuilding and ship repair company in the United States, operates shipyards in or near Seattle,

San Francisco, Los Angeles, Galveston,

Houston, New Orleans and New York.

TODD SHIPYARDS CORPORATION

One State Street Plaza, New York, N.Y. 10004

Telephone: (212) 344-6900 Cable: "Robin" New York

NEW YORK/LOS ANGELES/SAN FRANCISCO SEATTLE

NEW ORLEANS/HOUSTON/GALVESTON

November 1, 1981 15