Page 44: of Maritime Reporter Magazine (December 15, 1973)

SNAME T&R Bulletin

Offers Preliminary

Ship Design Aid

The naval architect, in designing a new ship, must evaluate power requirements for a number of choices of hull forms and propor- tions. Some of the necessary in- formation for such evaluations can be derived from using the results •of ship model experiments in which the principal characteristics of the ship hull have been changed in a systematic manner. The results of such methodical series are usually used to plot design charts or tables which are of inestimable value to the designer. Selecting a methodi- cal series made with a hull form similar to his proposed ship, the designer could use the results for a preliminary evaluation of resist- ance and powering requirements.

A large number of methodical ship model resistance tests have been made, but the results are so scattered in the literature that it is often difficult to determine ex- actly what information is available.

In an attempt to rectify this situa- tion, Panel H-2 (Resistance and

Propulsion) of The Society of Na- val Architects and Marine Engi- neers' Technical and Research (T&R) Program in 1970 reviewed the known international literature on this subject and prepared T&R

Bulletin 1-31, "Index of Methodical

Ship Model Resistance Tests."

The bulletin contains informa- tion on over 125 different series tests from eight countries. The in- formation provided includes type of ship tested, where the test was conducted and original publication, range of principal dimensions and proportions investigated, speed, range covered, method of presen- tation of resistance results, skin friction basis, model size, any pro- pulsion experiments conducted, and other pertinent comments concern- ing the tests.

In addition, a summary bibliog- raphy is included that lists all the series tests and what hull propor- tions and form parameters are in- vestigated. This will allow the user to quickly determine whait tests pertain to the subject he is inter- ested in, such as the effect of vary- ing the block coefficient or the position of the longitudinal center of buoyancy.

The bulletin is offered in loose- leaf tabbed format for easy expan- sion as the Society intends to pub- lish supplemental data as further results .of other series tests are re- ceived, thus offering the user as complete an index as possible, as well as serving as a forum for the distribution of information or other tests what have been or will be done by testing 'facilities. It thus also provides valuable information to towing tank establishments by giving the user an idea of what work has been done and what areas still need ito be investigated further.

T&R Bulletin 1-31, "Index of

Methodical Ship Model Resistance

Tests," has been approved for pub- lication iby the Hydrodynamics

Committee of the Society's T&R

Program and is available from The

Society of Naval Architects and

Marine Engineers, 74 Trinity

Place, New York, N.Y. 10006, at a price of $27.75 per copy. Mem- bers of the Society may obtain a copy of the bulletin for $18.50. If payment is received with the order, these prices include postage via third class mail in the United

States and as "Printed Matter" in all other countries. Shipments will be insured or sent air mail at addi- tional cost only if requested.

Foreign-Flag Operator

To Switch To U.S. Flag

The Zapata Corporation recent- ly sold to foreign buyers all stock in Zapata Naess Shipping Com- pany Limited, a subsidiary engaged in the operation of bulk vessels under various foreign flags, for $208 million.

A significant portion of the pro- ceeds of ithis transaction has been labeled by /the company for rein- vestment in shipping, with particu- lar emphasis on U.S.-flag. The pri- mary recipient of this reinvestment will be Zapata Bulk Transport, Inc. of New York, a wholly owned sub- sidiary, which has applied to the

Maritime Administration for sub- sidy to construct three giant 390,- 000-dwt tankers. 500 KW

GENERATORS •fr DIESEL ENGINES

General Motors, Model 12-278A,

Marine, 720 RPM •fr AC GENERATORS

General Electric, 500 KW, 440/3/60,

Type ATI 2-COMPLETE UNITS IN STOCK, as re- moved from ex-Navy Cruiser "Worcester."

Units were standby auxiliaries, and are very clean and in good condition.

TURBINE GENERATORS —AC VOLTAGES— 2- 1500 GENERAL ELECTRIC Turbines:

Type FN4-FN30, Steam 525 PSIG. 8145

RPM, with G.E. Generators, 1500 KW, 450/3/60. 4- 1250 KW, GENERAL ELECTRIC Tur- bines: Type FSN, 525 PSI, 7938 RPM. Gen- erators: 1250 KW, 450/3/60, 3600 RPM,

Type ABT2. 7-750 KW, GENERAL ELECTRIC Tur- bines Type FN3-FN24, .525 PSI, 10,033

RPM. Generators: 750 KW, 450/3/60,1200

RPM, Type ATI. 4-500 KW, GENERAL ELECTRIC Tur- bines: Type FN3-FN20, Steam 375/425

PSI, 6 Stage, 9987 RPM. Generators: 500

KW, 450/3/60, 1200 RPM, Type ATI. xtx nfr

For prompt quotation

Contact: Ralph E. Ingram

ZIDELL

EXPLORATIONS, INC. 3121 S.W. Moody Avenue

Portland, Oregon 97201

Phone: Telex: 503/228-8691 36-0503

BUILDING A NEW BOAT ? caM Mdttm first-

Matton Shipyard Company, Inc. offers complete facilities for all new construction of vessels up to 200 feet in length. • Repairs • Conversions • Overhaul

For your next new vessel or repair job . . . call

Matton first.

MATTON SHIPYARD COMPANY INC.

P. O. Box 428, Cohoes, New York 12047

Tel: 518 CE 7-3911

In over 65 million gross registered tons of world merchant shipping, every time * injuries occur to crew, passengers or shore workers it cargo is lost or damaged, or * collision or pollution liabilities arise cover and protection is provided by the UK P&l Club (Bermuda), the largest protection and indemnity association in the world: Managers: Thos. R. Miller & Son (Bermuda).

Send for your copy of 'MUTUALITY' to the managers' London agents:

Thos. R. Miller & Son. 14-20, St. Mary Axe, London EC3A 8DA, England.

Telephone: 01 -283 4646. Telex: 885271. Cables: Mutuality London. 44 Maritime Reporter/Engineering News