Page 5: of Maritime Reporter Magazine (March 15, 1981)

J.J. Henry Company

Opens West Coast

Office In San Diego

A.C. Brown, senior vice presi- dent of the J.J. Henry Co., Inc. and general manager of the

Moorestown Production Division, has announced the opening of a branch office in San Diego. The new facility will be fully coordi- nated with the firm's Production

Division headquarters in Moores- town, N.J., and like the branch offices in Crystal City and Ports- mouth, Va., will provide a com- plete range of engineering serv- ices to new construction yards, repair facilities, vessel owners and operators, and industrial firms throughout the West in both the governmental and com- mercial sectors.

A.L. Jenks has joined the

Henry Company as manager of the San Diego operation follow- ing a career as an engineering duty officer in the United States

Navy, from which he retired as a captain. Mr. Jenks will report to Richard R. Hopkins, vice pres- ident, in Moorestown. Marketing efforts for the West Coast oper- ation will continue to be directed by David F. McMulIen, vice pres- ident. The office is located at 3456

Camino Del Rio North, San Diego,

Calif. 92108; (714) 283-2319.

Hampton Roads SNAME

Section Hears Paper On

Rudder Torque Prediction

The Hampton Roads Section of

The Society of Naval Architects and Marine Engineers kicked off its first meeting of 1981 with a technical presentation at the Fort

Monroe Officers Club in Hampton,

Va. As expected, a large turnout of 121 members and guests was present to hear the evening's pa- per titled "Rudder Torque Pre- diction," by Roy L. Harrington, naval architect and technical man- ager of Newport News Shipbuild- ing.

Taking into consideration the large amount of study that has gone into the analysis of the flow around ships' hulls and the per- formance of controlled surfaces, it would appear that an accurate prediction of the torque required to exercise the rudder on a large ship would be a simple under- taking ; however, such is far from the case. After studying the nu- merous factors that theoretically must be dealt with when predict- ing rudder torque, it is apparent that the achievement of precise rudder torque predictions will re- main out of reach for many years.

This being the case, the practic- ing naval architect must deter- mine how to make the best use of the data and analysis tech- niques currently available.

Mr. Harrington's paper dis- cussed the various considerations

March 15, 1981 to be evaluated when establishing rudder torque design values, an- alyzed procedures for predicting rudder torque requirements, and gave examples for rudders of the spade and horn types. Rudder type calculations were made for six ships, and the results were compared with data recorded dur- ing sea trials.

Written discussions were pre- pared by: H.G. Acker, Bethlehem

Steel-Sparrows Point; Deborah

Berman, U.S. Merchant Marine

Academy; Charles F. Butler,

Newport News Shipbuilding; Ed- win T. Cangin, Mar Ad; Conway

D. Davis, Ingalls Shipbuilding;

A. Fairlie-Clarke, Vickers Engi- neering Group Ltd.; Everett C.

Hunt, U.S. Merchant Marine

Academy; J.R. Kane, consultant;

H.T. McVey, H.T. McVey & Asso- ciates ; Perry W. Nelson, M. Ro- senblatt & Son; A. Rem, Nether- lands Ship Model Basin; Stanley

G. Stiansen, American Bureau of

Shipping; Robert Taggart, Rob- ert Taggart Inc.; A. Taplin, con- sultant ; L. Vassiloupoulos, Mari- tech Inc.; and W.S. Vorus, Uni- versity of Michigan.

Both the paper and the written discussion are considered to be a significant contribution to the field of naval architecture. Copies of both the paper and the discus- sion are available from the Hamp- ton Roads Section.

Avondale... 40 years of diversified shipbuilding and offshore construction

Proven Performance

Since 1938, Avondale has constructed over 2,300 vessels.

In the period from 1967 to 1977 alone, 95 major ships were delivered. And in 1978, the Avondale Offshore Division has built 33 offshore drilling rigs, 20 jackets and 19 decks.

Diverse Interests

Avondale never limits its interest in ship construction by type, size or quantity. Our design capability has been developed as a service to the industry for the development of new ship designs, and to review existing designs for possible improvements. We can meet all of your requirements. Similar diversification has been developed for the offshore industry.

Unique Capabilities

Avondale's facilities are among the most modern in the

United States. We are extremely proud of the fact that many unique construction techniques have been developed in response to challenges from the industry for certain types of vessels and rigs. But. .. the real reason for Avondale's capabilities is its people and their dedication to being the nation's best shipbuilders.

Let us respond to your next inquiry.

The Quality s of America ft

INC

Avondale Shipyards, Inc.

A Subsidiary of Ogden Corporation

Post Office Box 50280 • New Orleans, Louisiana 70150 (504) 436-2121

Top to bottom:

INTEGRATED TUGIBARGE - We welcome the opportunity to bid on special projects.

OIL TANKERS - Most recently to carry pipeline oil from Alaskan ports.

PLATFORMS - Avondale has capabilities in all offshore services.

LASH SHIPS - Avondale pioneered containerized vessels for dry cargo.

BARGES - Avondale is a master barge builder, to your requirements.

DRILLING RIGS - Avondale capabilities are varied from large to small.

LNG/LPG SHIPS - Immense vessels to serve inter-continental tradeiroutes.

CONVERSIONS - Our massive drydock enables us to add new midbodies.

WORKBOATS - Now on order, the workboats of the future.

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