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CORPORATION June 1, 1974 The New York Metropolitan Sec- tion of The Society of Naval Archi- tects and Marine Engineers met on April 23, 1974, at the Stevens Insti- tute of Technology, Stevens Cen- ter, Hoboken, N.J. Following a social hour and din- ner, the technical session was held during which a paper was presented entitled "Stability and Loading Manuals—A Survey of Needs, Uses and Improvements," by W.H. Garzke Jr., Gibbs & Cox, Inc., A.C. Landsburg, Maritime Administra- tion, 'and R. Johnson, U.S. Coast Guard. This paper reviews the contents and purposes of the stability, trim and loading manuals and proposes some changes that could be made to improve their value in view of present requirements for general cargo, container, barge carrying, bulk dry cargo and bulk liquid ships. The results of a survey questionnaire concerning the use of such information by shipboard personnel and the opinions of ship- owners on the value and use of such information is presented. Spe- cial needs of new designs are con- sidered in such areas as high-speed containerships, barge carrying, VLCC loading, slurry loading, grain shifting, computerization, strain gauges, damage control, ma- neuvering and seakeeping studies. Various techniques and formal- changes are presented and discuss- ed as to their relative merits. Em- phasis in the paper is placed on creating booklets of greater utility to shipboard personnel. NEWEST ADDITION TO SKAARUP FLEET CHRISTENED AT SASEBO: The M/S Colon Brown (shown above), newest addition to the Skaarup fleet, was christened recently at the Sasebo Shipyards in Japan by Miss Cathrine Skaarup, daughter of Ole Skaarup, chairman of the board of Skaarup Shipping Corporation. Designed by Ole Skaarup jointly with naval architects, Knud E. Hansen of Copenhagen and Nordstroms Linbanor of Swe- den, the 26,000-ton Colon Brown represents a further development of the self-unloading bulk carrier concept pioneered by Skaarup in the mid-1 950's, with the construction of the M/S Melvin H. Baker. Following her maiden voyage to Bunbury, Australia, the Colon Brown will be delivered to National Gypsum Company for service in the Nova Scotia to U.S. East Coast gypsum trade. Acurex Announces Torsionmeter System For Large Shafts Acurex Corporation announces a new non-contacting high-accuracy torsionmeter for large shafts. It is an easily installed, virtually main- tenance-free system for measuring torque on shafts up to more than 30 inches in diameter. Typical torque loads range from 50,000 ft-lb to over 4.5 million ft-lb. This Acurex system is factory calibrated before installation, which eliminates difficult and costly on- shaft calibration. Accuracies of better than 1 percent can be achiev- ed over wide variations in ambient temperature; the unique design of the sensor accounts for changes in the shaft modulus of rigidity with temperature. Another feature is that maintenance requirements are minimal and infrequent because there is no contact between rotat- ing and stationary components. Originally, this torsionmeter was designed for, and will be used on, the U.S. Navy DD-963 Spruance- Class Destroyer. As a result of having met stringent military spe- cifications, this torsionmeter is ca- pable of performing under extreme- ly rugged environmental condi- tions. The Acurex torsionmeter is based on reliable design concepts made possible by the invention of solid-state microcircuitry. It con- sists of a hermetically sealed strain gage transducer Which senses the relative twist angle between two lightweight collars clamped on the shaft. A microcircuit, sealed inside the transducer, provides stable ex- citation voltage to the strain gages as well as amplification and encod- ing of the gage output signal. One collar acts as both the sec- ondary winding of a transformer for input power, and a capacitive antenna for the signal. Available outputs include analog voltage for feedback control, digital readout and BCD output for computer analysis. Further information can be ob- tained by contacting Ted Tilton, Acurex Corporation, 485 Clyde Avenue, Mountain View, Calif. 94042. the 10-2510 Serie BELL LOGGER Automatically records Bridge engine orders and Engineroom reply, throttle setting, actual shaft speed and direction. It also logs Control location and such other information as you may require: propeller pitch, course, speed, use of thruster, etc. It prints data for each shaft, if a multiscrew vessel, records it period- ically with the date and exact time to the nearest second. Somewhat smaller and more compact than the earlier models, with a wider tape for greater data capacity, the Logger is designed for platform mounting in any convenient location. It presents its information contin- uously in a lighted digital display and perma- nently records the identical data on tape for easy reading as a sequence of precisely timed events. New delay circuits, controllable from the panel, eliminate needless repetitive printouts as when shaft speed varies slightly due to heavy weather, to minor throttle adjustments, or while the ship is responding to a change in speed demand. A built-in crystal controlled time stan- dard and an emergency power supply ensure continuing accuracy under virtually any ship- board condition. Solid state circuitry and plug-in modules make this a system of high reliability and easy maintenance. The Henschel Bell Logger is often used as the ship's master clock. Any number of remote digital clock units can be provided in a system to show identical exact time any- where on board. Write for complete information and data sheets. Or telephone 617 388 1103. 14 Cedar Street, Ames bury, Massachusetts 01913. New York SNAME Surveys Needs, Uses And Improvements Of Stability And Loading Manuals Shown above during the meeting at the Stevens Institute of Technology, left to right: Walter M. Maclean, chairman, papers committee; A.C. Landsburg, Manager, Design Division, Office of Ship Construction, Maritime Administration, author; William H. Garzke Jr., Hull Division, Gibbs & Cox, Inc., author; Ralph E. Johnson, naval architect, Office of Merchant Marine Safety, USCG, author; Patricia M. McGovern, chairman, meetings committee; Donald B. Carpenter, chairman, New York Metropolitan Section; Arnold M. Stein, chairman, membership committee, and Robert F. Fulton, Gibbs & Cox, Inc., Section secretary-treasurer.
