Page 39: of Maritime Reporter Magazine (March 1980)

TANO Wins $2.6-Million

Contract For Marine

Automation Systems

TANO Corporation, New Orleans, La., has been awarded a $2,852,000 contract by Avon- dale Shipyards, Inc. to provide centralized control and monitoring systems for the three containerships Avondale is currently build- ing for American President Lines Ltd.

The ships, which will be powered by large, low-speed diesel engines, will utilize the

TANO control and monitoring systems to allow operation of machinery in space un- attended by engine room personnel. The systems, including engine control room and wheelhouse consoles, will provide control and monitoring of the vessels' powerplants, as well as fuel, oil and ballast tanks. Single- lever bridge propulsion control is also in- cluded.

The TANO systems will be built to Amer- ican Bureau of Shipping ( + ACCU) and U.S.

Coast Guard requirements for vessels with periodically unattended machinery spaces.

TANO has designed, manufactured and installed more than 70 marine automation systems on major commercial and naval vessels since 1971, including two of the larg- est commercial vessels ever built in a U.S. shipyard.

For free copies of the TANO equipment literature, write to James J. Reiss Jr., pres- ident, TANO Corporation, 4301 Poche Court

West, New Orleans, La. 70129.

Loran-C Brochure Is

Available From Navidyne

A brochure describing the expanded

Loran-C system and a new Loran-C receiver has recently been published by Navidyne

Corporation, Newport News, Va.

A new product, the ESZ-7000 Loran-C

Navigator, shows all navigation data, in- cluding latitude and longitude, on a CRT display. The ESZ-7000 draws heavily upon technology developed by Navidyne for its successful ESZ-4000 Satellite Navigator.

Introduction of the ESZ-7000 was timed to coincide with the recent expansion of the

Loran-C system by the U.S. Coast Guard.

Coverage is now available in all U.S. coastal waters, including the Great Lakes, in ad- dition to large portions of the Mediterranean,

North Sea, North Atlantic, and Pacific.

The Navidyne brochure explains how the

Loran-C system works and describes the operation of the ESZ-7000. For a free copy of this brochure, write Ed Easter, Navidyne

Corporation, 11824 Fishing Point Drive,

Newport News, Va. 23606.

Student Paper Presented

At The New England

Section Of SNAME

At the fourth meeting of the New Eng- land Section of The Society of Naval Archi- tects and Marine Engineers, Todd P^ltzer,

Ensign, USN, presented a paper entitled "On the Use of High-speed Photography in the

Study of Propeller Cavitation." Ensign

Peltzer is a recent graduate at the Massa- chusetts Institute of Technology, having received his S.B. degree in naval architec- ture and marine engineering in June 1979.

The speaker discussed in detail research conducted at M.I.T. during the 1978-79 aca- demic year, involving the use of high-speed photography in the study of propeller cavi- tation. The objective of this research was

March 1, 1980 to obtain a set of photographs from which the extent of cavitation could be determined quantitatively. As background, the signifi- cance of such measurements to the general study of cavitation was discussed. The dif- ficulties encountered in previous attempts at the use of high-speed photography in cavitation research were also discussed.

The solution to these problems was the motivation for the use of some advanced photographic techniques. In particuar, the introduction of Kodak Ektachrome 400 film, and the development of a digital time-delay unit made possible a detailed photographic survey of propeller cavitation. These photo- graphic techniques formed the basis for experiments which produced a series of photographs of a five-bladed, gold-anodized propeller, taken at one degree intervals, and at cavitation indices of 2.05, 2.5, and 3.0.

While the quality of these photographs was excellent, geometrical distortions precluded any meaningful quantitative measurements of cavitation extent.

This problem inspired further experimen- tation using a four-bladed brass propeller.

Here, the fixed wake screen used in the pre- vious experiment was replaced by a rotat- alile wake screen, allowing the propeller to be photographed in a singe orientation and yet still achieve the desired variation in flow. From these measurements, an estima- tion of cavity volume was made yielding a history of cavity formation and collapse.

These volume estimates very closely agree, within experimental limits, with the pre- diction of a numerical lifting surface com- puter model.

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